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72 results on '"Akio Kiyomichi"'

1. Low-emittance beam injection for a synchrotron radiation source using an X-ray free-electron laser linear accelerator

Author

Toru Hara, Tsuyoshi Aoki, Hideki Dewa, Takahiro Fujita, Kenji Fukami, Toru Fukui, Toshihiko Hiraiwa, Naoyasu Hosoda, Takahiro Inagaki, Toshiro Itoga, Eito Iwai, Akio Kiyomichi, Chikara Kondo, Hirokazu Maesaka, Mitsuhiro Masaki, Shinichi Matsubara, Osamu Morimoto, Takashi Ohshima, Masaya Oishi, Masazumi Shoji, Kouichi Soutome, Yasuyuki Tajiri, Shiro Takano, Kazuhiro Tamura, Yukiko Taniuchi, Kazuaki Togawa, Takahiro Watanabe, Toshinori Yabuuchi, and Hitoshi Tanaka

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

The full-energy beam injection system from SACLA to the SPring-8 storage ring has been developed. Low-emittance beam injection is required for the future upgrade of SPring-8 due to its small injection beam aperture. The electron beam injection from an X-ray free-electron laser linear accelerator not only satisfies the emittance requirement but also it confers a cost benefit compared to a conventional dedicated injector system. In SPring-8, the SACLA linear accelerator is now delivering X-ray free-electron laser photon beams and serving as a full-time injector of SPring-8 in parallel.

Published
2021
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2. Experimental study of in-medium spectral change of vector mesons at J-PARC

Author

Kazuya Aoki, Daichi Arimizu, Sakiko Ashikaga, Wen-Chen Chang, Tatsuya Chujo, Kengo Ebata, Hideto En'yo, Shinichi Esumi, Hideki Hamagaki, Ryotaro Honda, Masaya Ichikawa, Shunsuke Kajikawa, Koki Kanno, Yuta Kimura, Akio Kiyomichi, Takehito Kondo, Shono Kyan, Che-Sheng Lin, Chih-Hsun Lin, Yuhei Morino, Hikari Murakami, Tomoki Murakami, Ryotaro Muto, Shunnosuke Nagafusa, Wataru Nakai, Satomi Nakasuga, Megumi Naruki, Toshihiro Nonaka, Hiroyuki Noumi, Shuta Ochiai, Kyoichiro Ozawa, Takao Sakaguchi, Hiroyuki Sako, Fuminori Sakuma, Susumu Sato, Shinya Sawada, Michiko Sekimoto, Kenta Shigaki, Kotaro Shirotori, Hitoshi Sugimura, Tomonori Takahashi, Yudai Takaura, Ryohei Tatsumi, Kosuke Tsukui, Po-Hung Wang, Kanta Yahiro, Kanako Yamaguchi, and Satoshi Yokkaichi

Abstract

Chiral symmetry and its spontaneous breaking is an essential property of the QCD vacuum and is closely related to the generation of hadron mass. J-PARC E16 experiment measures dielectron spectra in p+A collisions at 30~GeV to study the in-medium spectral change of vector mesons that signals the partial restoration of the broken symmetry. The experiment uses the primary proton beam available at the high-momentum beam line of the J-PARC hadron experimental facility.We performed three proton-beam runs intended for beamline and detector commissioning. We are preparing for the next commissioning run in 2023 and the first physics run. We present the experimental setup, some of the expected results, preparation status, and some findings in the commissioning runs.

Published
2023
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3. Low-emittance beam injection for a synchrotron radiation source using an X-ray free-electron laser linear accelerator

Author

Eito Iwai, Takashi Ohshima, Kazuaki Togawa, Akio Kiyomichi, Shinichi Matsubara, Tsuyoshi Aoki, Masaya Oishi, Naoyasu Hosoda, Hitoshi Tanaka, Toru Fukui, Toru Hara, Toshiro Itoga, Masazumi Shoji, Chikara Kondo, Yukiko Taniuchi, Takahiro Inagaki, Toshihiko Hiraiwa, Takahiro Fujita, Shiro Takano, Hirokazu Maesaka, Osamu Morimoto, Hideki Dewa, Takahiro Watanabe, Kouichi Soutome, Kenji Fukami, M. Masaki, Yasuyuki Tajiri, Toshinori Yabuuchi, and Kazuhiro Tamura

Subjects
Nuclear and High Energy Physics, Low emittance, Materials science, Physics and Astronomy (miscellaneous), business.industry, X-ray, Synchrotron Radiation Source, Free-electron laser, QC770-798, Surfaces and Interfaces, Linear particle accelerator, Optics, Nuclear and particle physics. Atomic energy. Radioactivity, Physics::Accelerator Physics, business, Beam (structure)
Abstract

The full-energy beam injection system from SACLA to the SPring-8 storage ring has been developed. Low-emittance beam injection is required for the future upgrade of SPring-8 due to its small injection beam aperture. The electron beam injection from an X-ray free-electron laser linear accelerator not only satisfies the emittance requirement but also it confers a cost benefit compared to a conventional dedicated injector system. In SPring-8, the SACLA linear accelerator is now delivering X-ray free-electron laser photon beams and serving as a full-time injector of SPring-8 in parallel.

Published
2021
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4. Measurement of Vector Meson Mass in Nuclear Matter at J-PARC

Author

Michiko Sekimoto, Hitoshi Sugimura, K. N. Suzuki, Ryotaro Muto, Akio Kiyomichi, Takao Sakaguchi, Yuhei Morino, Hiroyuki Sako, Koki Kanno, Hikari Murakami, S. Miyata, H. En'yo, Kazuya Aoki, Yosuke Watanabe, S. Sawada, Fuminori Sakuma, S. Ashikaga, Tatsuya Chujo, Kenta Shigaki, Wataru Nakai, Ryohei Fujii, Ryotaro Honda, S. Yokkaichi, ShinIchi Esumi, Kyoichiro Ozawa, T. Takahashi, Hideki Hamagaki, M. Ichikawa, Hiroyuki Noumi, Susumu Sato, Megumi Naruki, Yusuke Komatsu, and T. Murakami

Subjects
Quantum chromodynamics, Physics, Particle physics, Meson, Nuclear Theory, Hadron, High Energy Physics::Experiment, Elementary particle, Vector meson, Nuclear Experiment, Nuclear matter, Lepton, Boson
Abstract

An experiment at J-PARC, E16 experiment, which aims to measure the spectral modification of vector meson in nuclear matter is planned. The experiment will measure light vector mesons (ρ/ω/ϕ mesons) generated in nuclear target through the 30 GeV p+A reactions. The mass spectra can be reconstructed with e^+e^− pairs originating from their decays. The spectral modification in finite baryon density is studied systematically. The detail of the experimental plan and expected results are presented with a particular focus on first physics run.

Published
2019
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5. Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions

Author

A. Sen, V. S. Pantuev, M. Sano, M. Stepanov, Emily D. Richardson, X. He, J. Zimamyi, O. O. Omiwade, M. Harvey, S. Belikov, K. S. Joo, A. Rakotozafindrabe, J. Hamblen, K. Hasuko, Y. Aramaki, V. Peresedov, Y. Watanabe, Ajit Kumar Mohanty, T. A. Shibata, C. L. Silva, R. A. Soltz, T. Sato, C. M. Camacho, R. S. Towell, Prashant Shukla, S. F. Pate, Dmitry Blau, Y. Fukao, A. Shevel, O. Jinnouchi, H. En'yo, J. Koster, M. Grosse Perdekamp, A. Hadj Henni, T. Hester, I. Younus, Ke. Nakamura, O. Drapier, H. Al-Bataineh, E. Vazquez-Zambrano, A. Nederlof, J. Park, H. Masui, A. K. Dubey, F. Matathias, H. Asano, Florian Bauer, M. Kasai, Y. Iwanaga, Joakim Nystrand, A. Vossen, T. L. Thomas, I. E. Yushmanov, Eun-Hee Kim, P. Constantin, Beomkyu Kim, Wei Xie, M. J. Leitch, A. A. Bickley, C. L. Woody, A. Veicht, A. Mwai, Eva Haslum, B. Lenzi, A. Soldatov, D. Isenhower, A. Toia, Tamas Novak, T. Moon, Kensuke Homma, H. Pei, L. Guo, Alexei Khanzadeev, Shinichi Masumoto, E. Stenlund, J. B. Choi, H. Sakata, Min-Hye Kim, R. Vértesi, S. H. Lee, Dipak Kumar Mishra, C. Baumann, M. S. Daugherity, C. P. Singh, T. Jones, Z. Rowan, Tomoya Tsuji, J. H. Bhom, T. V. Moukhanova, M. Mendoza, Peter Christiansen, R. Ichimiya, Atsushi Takahara, L. Mašek, D. Kawall, K. Tanida, Ryugo S. Hayano, I. J. Choi, B. Xia, S. Motschwiller, D. Ivanishchev, Dennis Perepelitsa, H. Themann, S. Chernichenko, V. Papavassiliou, Z. Ji, D. Winter, D. Yu Peressounko, Y. Riabov, Y. Onuki, C. E. Perezlara, Filip Krizek, N. A. Lewis, K. A. Drees, H. Lim, B. Bassalleck, S. Takagi, J. Bryslawskyj, Kenta Shigaki, M. Boer, M. Nguyen, V. I. Kochetkov, L. Aphecetche, S. Park, J. Murata, I. Nakagawa, Aaron Angerami, V-N. Tram, N. Grau, R. J. Petti, Sándor Lökös, K. N. Barish, J. M. Burward-Hoy, P. Tarján, S. N. White, J. G. Lajoie, Deepa Thomas, Jan Rak, R. Lacey, A. V. Kazantsev, Alexander Milov, Tae-Yeon Lee, Martin Purschke, C. A. Aidala, H. J. Kim, R. Granier de Cassagnac, A. Isupov, C. Suire, A. S. Nyanin, S. Zharko, S. Sano, S. Butsyk, Vladimir Samsonov, M. Konno, Gerd Joachim Kunde, A. Dion, Johannes Peter Wessels, I. Ravinovich, J. L. Charvet, S. Afanasiev, A. Ster, N. Feege, I. Otterlund, Christine Nattrass, A. Adare, J. Klatsky, C. P. Wong, M. Connors, W. A. Zajc, V. Baublis, A. Denisov, M. Leitgab, J. Sziklai, I. Shein, V. Cianciolo, Zvi Hirsh Citron, H. Ge, Rachid Nouicer, A. N. Zelenski, M. Proissl, Young-Ki Kim, T. Engelmore, Y. Tomita, Motoi Inaba, K. Nakano, M. J. Skoby, J. Newby, G. Roche, M. Mitrovski, Takafumi Niida, J. Huang, Hiroaki Ohnishi, K. B. Lee, Brian Cole, L. Tomášek, R. M. Wright, T. E. Miller, M. Kurosawa, Sergey Fokin, Z. Sun, A. Yu. Semenov, Bum-Hoon Lee, D. E. Mihalik, Senta Greene, K. Sedgwick, M. L. Brooks, S. Yokkaichi, W. C. Smith, B. M. Johnson, Alberto Baldisseri, Mihael Makek, K. Das, J. T. Mitchell, P. Mikeš, N. Hotvedt, R. Seidl, M. K. Dayananda, Prakhar Garg, B. Bannier, R. Belmont, M. Sarsour, A. T. Basye, M. K. Lee, B. Love, Marie Germain, C. Xu, E. P. Hartouni, Y. Miyachi, K. B. Kim, W. E. Sondheim, K. Boyle, P. A. Rukoyatkin, K. S. Sim, Kei Nagashima, V. Canoa Roman, P. Chung, M. I. Nagy, A. Morreale, Z. Fraenkel, Y. Nagata, M. Bai, D. Watanabe, M. D. Malik, Vladislav Manko, Saskia Mioduszewski, H. A. Gustafsson, M. Slunečka, E. Vznuzdaev, E. C. Aschenauer, S. S. Ryu, J. S. Kang, Junji Tojo, J. Gosset, Mate Csanad, A. Berdnikov, C. Zhang, J. P. Sullivan, A. Iordanova, A. Caringi, Frank Ellinghaus, E. R. Kinney, D. P. Morrison, B. H. Kang, M. Naglis, Tomofumi Nagae, J. L. Nagle, S. Y. Fung, M. B. Deaton, Y. Tanaka, T. K. Shea, P. Rosnet, B. Meredith, V. Khachatryan, D. Hornback, B. Komkov, P. Castera, J. Imrek, V. E. Semenov, B. E. Norman, M. Holmes, P. Ružička, Raphael Noel Tieulent, W. S. Emam, A. Datta, M. Javani, B. Fadem, E. O'Brien, Y. Kwon, A. G. Litvinenko, A. Kozlov, R. Seto, A. Bagoly, Maya Hachiya Shimomura, R. S. Hollis, G. David, L. Patel, T. C. Awes, Kyoichiro Ozawa, T. Liška, K. O. Eyser, K. Fujiwara, Y. L. Yamaguchi, N. Kamihara, R. K. Choudhury, T. Murakami, Robert F. Hobbs, B. Lewis, Viktor Riabov, Jun Kikuchi, Tadaaki Isobe, B. Azmoun, Y. J. Mao, K. Haruna, T. W. Danley, J. D. Osborn, A. Taranenko, R. Yang, H. Hiejima, S. Taneja, Kazushi Miki, H. Al-Ta'Ani, A. Král, M. J. Kweon, H. Kanou, J. S. Chai, Petr Gallus, T. Majoros, L. Ding, D. Roach, K. M. Kijima, Taku Gunji, H. Gong, M. Nihashi, Tatsuya Chujo, D. Richford, Zhiying You, K. Imai, Shoji Nagamiya, John Hill, K. Hashimoto, T. Horaguchi, Brajesh K. Singh, C. Silvestre, R. Bennett, M. Kawashima, J. Seele, Yoshifumi Ueda, H. J. Moon, Norio Saito, Tsutomu Mibe, P. Liebing, M. A. L. Leite, D. Sharma, C. Vale, P. L. McGaughey, K. Karatsu, M. Patel, F. Kajihara, F. Staley, L. Baksay, V. Dzhordzhadze, I. Danchev, A. Garishvili, David D'Enterria, Gary Grim, J. H. Do, T. Tabaru, S. Batsouli, B. Kurgyis, Toru Sugitate, L. D. Isenhower, K. V. Dharmawardane, Susumu Sato, Y. I. Makdisi, M. Kaneta, Xingguo Li, B. S. Chang, Y. Le Bornec, Ahmed Al-Jamel, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Charles Maguire, J. L. Drachenberg, S. Leckey, M. Finger, S. Tarafdar, G. Mitsuka, Y. Hori, Anne Marie Sickles, J. Jin, J. E. Frantz, Jen-Chieh Peng, K. Gainey, I. V. Sourikova, N. Novitzky, Jongmin Lee, S. Choi, J. Klay, S. I. Morrow, H. Delagrange, Y. S. Kim, Y. H. Leung, Josh Moss, E. M. Takagui, S. P. Sorensen, Dylan Walker, R. P. Pisani, Debashish Pal, Y. Nakamiya, D. Lynch, S. Sawada, J. S. Bok, D. Kotchetkov, D. Reynolds, François Fleuret, H. W. Van Hecke, Y. Tsuchimoto, T. Ichihara, M. Oka, O. Chvala, H. Iinuma, M. C. McCain, S. Hasegawa, R. Tanabe, D. Layton, I. Garishvili, Akio Kiyomichi, J. Ying, Seong H. Kim, F. Wei, Inkyu Park, M. McCumber, J. Runchey, E. Kistenev, Xiong Wang, Z. Conesa del Valle, S. Zhou, Matthew G. Reuter, Herve Borel, B. Ujvari, Nikolay Tyurin, M. N. Wagner, Susanta K. Mohapatra, J. S. Kapustinsky, Takahiro Fusayasu, G. R. Young, M. Alfred, T. Hachiya, G. Baksay, Dong Jo Kim, A. P.T. Palounek, K. Okada, P. Lichtenwalner, A. Kiss, P. Kline, K. S. Lee, S. D. Rolnick, A. Enokizono, B. Espagnon, L. Zou, H. Harada, I. D. Ojha, Alexander Malakhov, Qiao Xu, N. Kurihara, ShinIchi Esumi, A. Glenn, A. Kravitz, J. M. Heuser, W. C. Chang, Z. Yasin, Henner Buesching, J. Sun, B. Forestier, M. T. Bjorndal, D. Silvermyr, S. Baumgart, L. S. Zolin, M. Ouchida, V. Babintsev, W. J. Park, Steve Edwards, M. Tomášek, N. Means, J. Asai, Atsushi Taketani, M. Wysocki, I. Tserruya, Masamichi Ishihara, A. Sukhanov, K. Kurita, Rushan Han, M. N. Hagiwara, Christopher Rosen, S. H. Lim, H. Pereira, P. D. Barnes, H. Yu, X. Gong, Y. Morino, Yu. Efremenko, A. Yanovich, V. Singh, V. L. Rykov, T. Dahms, A. Hodges, Marcus Hohlmann, G. S. Kyle, C. O. Kim, R. Pak, N. Willis, C. Y. Chi, M. J. Tannenbaum, James Alexander, Y. Ikeda, Shingo Sakai, S. P. Stoll, L. A. Linden Levy, J. G. Boissevain, Yasutada Akiba, H. Torii, P. V. Radzevich, Hirohiko Sato, S. K. Tuli, Minghui Liu, S. Bathe, Eunja Kim, E. J. Mannel, Agneta Oskarsson, S. Dairaku, D. Kincses, T. Rinn, Y. Berdnikov, R. Averbeck, Byung-Sik Hong, C. McKinney, M. Mishra, Kazuhiro Tanaka, Vaclav Vrba, Klaus Johannes Reygers, K. Hill, O. Zaudtke, Rui Wei, R. Akimoto, B. Sahlmueller, E. J. Desmond, A. Bazilevsky, Y. J. Kim, B. K. Schmoll, M. Virius, E. T. Atomssa, M. Heffner, A. Kim, Jaehyeok Yoo, D. Mukhopadhyay, E. Tennant, S. Rembeczki, M. Gonin, C. Pinkenburg, K. Dehmelt, J. D. Orjuela Koop, S. Kametani, C. H. Chen, Kenneth Francis Read, A. Manion, Y. Cobigo, Alexandre Lebedev, J. H. Kang, D. M. Lee, D. Bucher, J. S. Haggerty, S. R. Lee, A. Romana, S. Gadrat, Y. S. Lai, K. Kiriluk, J. Chiba, Alice Mignerey, X. Jiang, L. D'Orazio, S. Miyasaka, A. Franz, G. C. Mishra, Xiao-yan Li, Hiroyuki Sako, Y. Komatsu, Takao Sakaguchi, S. W. Nam, C. Klein-Boesing, A. D. Frawley, S. Huang, S. H. Aronson, W. Holzmann, O. Dietzsch, H. Valle, M. Chiu, Dipanwita Dutta, C. A. Ogilvie, Sung Keun Park, C. Gal, Julia Velkovska, S. Kelly, M. Rosati, N. N. Ajitanand, T. K. Hemmick, J. M. Durham, Yasuo Miake, Tamás Csörgő, Takahiro Nakamura, D. McGlinchey, Susumu Oda, A. A. Vinogradov, Henrik Tydesjö, L. Kochenda, M. Issah, T. Shohjoh, A. Durum, T. Kawagishi, Jiangyong Jia, D. S. Brown, K. Yamaura, S. Wolin, D. Kleinjan, S. Campbell, Hongfang Liu, D. E. Fields, B. V. Jacak, A. K. Purwar, R. Armendariz, J. Hanks, Byoungchoo Park, N. Apadula, C. Oakley, A. Drees, J. Kubart, K. Sakashita, D. Kotov, J. Egdemir, D. S. Jumper, F. Gastineau, Jason Kamin, Y. Goto, S. S.E. Rosendahl, K. Watanabe, G. Bunce, K. Shoji, A. Churyn, D. Jouan, W. Peng, P. W. Stankus, C. R. Cleven, C. Haegemann, Y. Inoue, P. J. Kroon, T. Kempel, Dong-Hun Kim, S. Kaneti, M. G. Hur, Steven E. Skutnik, M. Togawa, T. O. S. Haseler, H. Qu, Hideki Hamagaki, W. Fan, K. Aoki, M. Vargyas, T. Todoroki, K. I. Hahn, A. Deshpande, Helsinki Institute of Physics, Laboratoire de physique subatomique et des technologies associées (SUBATECH), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), PHENIX, Université de Nantes - Faculté des Sciences et des Techniques, Université de Nantes (UN)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Centre National de la Recherche Scientifique (CNRS)-École polytechnique (X)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de physique subatomique et des technologies associées ( SUBATECH ), IMT Atlantique Bretagne-Pays de la Loire ( IMT Atlantique ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ) -Université de Nantes ( UN ), Laboratoire Leprince-Ringuet ( LLR ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -École polytechnique ( X ) -Centre National de la Recherche Scientifique ( CNRS ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Institut de Physique Nucléaire d'Orsay ( IPNO ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique de Clermont ( LPC ), Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Clermont Auvergne ( UCA ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Physique Nucléaire de Lyon ( IPNL ), Université Claude Bernard Lyon 1 ( UCBL ), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Photon, heavy ion: scattering, 62.4 GeV-cms, Au+Au collisions, General Physics and Astronomy, transverse momentum dependence, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], 39 GeV-cms/nucleon62.4 GeV-cms, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment (nucl-ex), Nuclear Experiment, 39 GeV-cms/nucleon, Physics, Range (particle radiation), RHIC, Large Hadron Collider, Multiplicative function, PHENIX, nucleus nucleus: colliding beams, PRIRODNE ZNANOSTI. Fizika, photon: direct production, CERN LHC Coll, photon: yield, COLISÕES DE ÍONS PESADOS RELATIVÍSTICOS, quark-gluon plasma, beam energy scan, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 114 Physical sciences, energy dependence, Nuclear physics, direct photons, energy: scaling, [ PHYS.HEXP ] Physics [physics]/High Energy Physics - Experiment [hep-ex], DILEPTONS, Au+Au collisions, beam energy scan, quark-gluon plasma, direct photons, PHENIX, RHIC, 0103 physical sciences, 010306 general physics, impact parameter: dependence, Scaling, Nuclear Physics, gold, NATURAL SCIENCES. Physics, Yield (chemistry), High Energy Physics::Experiment, Relativistic Heavy Ion Collider, Beam (structure), experimental results
Abstract

The PHENIX collaboration presents first measurements of low-momentum ($0.4$1\,GeV/$c$) direct-photon yield $dN_{\gamma}^{\rm dir}/d\eta$ is a smooth function of $dN_{\rm ch}/d\eta$ and can be well described as proportional to $(dN_{\rm ch}/d\eta)^\alpha$ with $\alpha{\approx}1.25$. This scaling behavior holds for a wide range of beam energies at the Relativistic Heavy Ion Collider and the Large Hadron Collider, for centrality selected samples, as well as for different, $A$$+$$A$ collision systems. At a given beam energy the scaling also holds for high $p_T$ ($>5$\,GeV/$c$) but when results from different collision energies are compared, an additional $\sqrt{s_{_{NN}}}$-dependent multiplicative factor is needed to describe the integrated-direct-photon yield., Comment: 673 authors from 82 institutions, 10 pages, 4 figures. v2 is version accepted for publication in Physical Review Letters. Plain text data tables for the points plotted in figures for this and previous PHENIX publications are (or will be) publicly available at http://www.phenix.bnl.gov/papers.html

Published
2019
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6. Low-momentum direct-photon measurement in Cu + Cu collisions at sNN=200GeV

Author

K. S. Joo, C. A. Ogilvie, T. K. Hemmick, O. Dietzsch, Yasuo Miake, E. T. Atomssa, H. Valle, J. G. Boissevain, C. P. Wong, T. Rinn, Masashi Kaneta, M. Connors, W. A. Zajc, Steven E. Skutnik, L. Kochenda, D. Kawall, S. Esumi, V. Baublis, Julia Velkovska, A. Denisov, V. Cianciolo, S. Bathe, T. O. S. Haseler, V. I. Kochetkov, Agneta Oskarsson, John Matthew Durham, M. Rosati, K. S. Sim, V. Dzhordzhadze, Y. Berdnikov, Y. Akiba, M. Mishra, C. Pinkenburg, K. Dehmelt, C. L. Woody, A. Berdnikov, Sergey Fokin, Tae-Yeon Lee, M. Grosse Perdekamp, G. Mitsuka, H. Qu, Junji Tojo, Y. Kwon, S. Nagamiya, Vaclav Vrba, Klaus Johannes Reygers, K. Hill, Y. Fukao, S. Park, J. Murata, Martin Purschke, C. A. Aidala, A. Shevel, S. Hasegawa, Hideki Hamagaki, W. Fan, K. Aoki, H. Hiejima, M. Stepanov, G. Roche, A. A. Vinogradov, K. O. Eyser, A. K. Purwar, K. Das, K. Fujiwara, E. P. Hartouni, A. Kiss, A. Bagoly, G. S. Kyle, Gerd Joachim Kunde, C. P. Singh, Z. Yasin, H. W. Van Hecke, T. Horaguchi, Henner Buesching, S. P. Sorensen, James Alexander, Dylan Walker, Herve Borel, N. Kamihara, R. Armendariz, T. Majoros, Jiangyong Jia, Y. Goto, K. Imai, J. T. Mitchell, N. Hotvedt, R. Seidl, N. A. Lewis, I. Shein, Petr Gallus, Marcus Hohlmann, R. Averbeck, A. Isupov, C. Suire, S. Kametani, T. Hester, M. J. Skoby, D. Sharma, Byung-Sik Hong, A. Bazilevsky, A. Morreale, Vladislav Manko, A. Taketani, A. Drees, J. Sziklai, Z. Fraenkel, V. L. Rykov, T. Dahms, J. G. Lajoie, Philippe Rosnet, V. Khachatryan, M. B. Deaton, S. Campbell, Anne Marie Sickles, P. Tarján, Alberto Baldisseri, C. L. Silva, S. Belikov, J. Kubart, H. A. Gustafsson, J. H. Kang, J. S. Haggerty, I. V. Sourikova, Brian Cole, A. Romana, R. S. Towell, J. S. Bok, D. Kotchetkov, L. Zou, Alexandre Lebedev, M. Alfred, T. Hachiya, I. Garishvili, Akio Kiyomichi, F. Wei, A. Hadj Henni, C. Zhang, Y. Tanaka, Masamichi Ishihara, D. E. Fields, T. L. Thomas, B. Azmoun, Y. J. Mao, A. Král, C. R. Cleven, C. Haegemann, Y. Inoue, John Hill, B. V. Jacak, M. J. Kweon, M. K. Lee, D. M. Lee, G. R. Young, N. Kurihara, Minghui Liu, V-N. Tram, E. J. Desmond, O. Zaudtke, C. Vale, B. S. Chang, A. Kravitz, D. Kotov, Ryugo S. Hayano, M. Naglis, M. Gonin, T. Hoshino, Nagahiro Saito, H. A. Torii, Toru Sugitate, J. Klay, H. Yu, J. Egdemir, L. D. Isenhower, F. Staley, L. Baksay, M. Heffner, Kenneth Francis Read, T. Ichihara, Viktor Riabov, M. Finger, Y. Riabov, J. Bryslawskyj, Wei Xie, M. McCumber, C. Y. Chi, M. Oka, Charles Maguire, B. Kurgyis, M. Togawa, Jan Rak, Y. Ueda, R. Lacey, Dong-Hun Kim, A. V. Kazantsev, Kenta Shigaki, M. Nguyen, J. Park, V. S. Pantuev, A. Dion, F. Matathias, Jason Kamin, K. Kurita, Kiyoshi Tanida, Y. S. Lai, Kensuke Homma, R. Granier de Cassagnac, A. Adare, E. Kistenev, H. Pereira, Motoi Inaba, J. D. Orjuela Koop, T. Tabaru, D. Richford, A. S. Nyanin, M. Sarsour, M. Csanad, S. P. Stoll, A. Rakotozafindrabe, M. Slunecka, R. Belmont, L. Tomášek, Z. Sun, P. Mikeš, A. Enokizono, Saskia Mioduszewski, P. Constantin, S. Chernichenko, Y. H. Leung, B. Komkov, H. Harada, D. E. Mihalik, J. Gosset, I. J. Choi, Rachid Nouicer, H. Pei, G. David, J. H. Do, B. Bassalleck, R. Pak, H. Iinuma, Y. Tsuchimoto, D. McGlinchey, Balazs Ujvari, M. Konno, Senta Greene, François Fleuret, K. Okada, Hiroaki Ohnishi, S. S.E. Rosendahl, T. C. Awes, Kyoichiro Ozawa, T. Liška, N. N. Ajitanand, A. P.T. Palounek, J. Jin, I. E. Yushmanov, Eun-Hee Kim, G. Bunce, H. En'yo, David D'Enterria, Jun Kikuchi, Alexei Khanzadeev, L. Aphecetche, E. M. Takagui, Y. Nakamiya, D. Lynch, M. J. Leitch, Tadaaki Isobe, I. Ravinovich, E. Stenlund, H. Sakata, N. Novitzky, Z. Rowan, S. N. White, A. Deshpande, M. Ouchida, G. Baksay, Takahiro Nakamura, P. L. McGaughey, M. A. L. Leite, B. E. Norman, J. Asai, E. O'Brien, M. Chiu, Y. Nagata, S. Yokkaichi, A. Churyn, D. Jouan, B. Sahlmueller, Susumu Oda, D. V. Perepelitsa, Johannes Peter Wessels, Xingguo Li, M. N. Wagner, Shingo Sakai, T. V. Moukhanova, R. A. Soltz, A. Durum, R. Vértesi, S. H. Lee, M. Issah, D. Watanabe, H. Ge, K. Nakano, M. D. Malik, E. Vznuzdaev, Y. Watanabe, J. D. Osborn, J. E. Frantz, V. Babintsev, W. E. Sondheim, I. Younus, R. Bennett, Jen-Chieh Peng, K. Boyle, P. A. Rukoyatkin, A. Soldatov, Osamu Jinnouchi, Matthew G. Reuter, Takahiro Fusayasu, Z. Ji, D. Winter, Hiroyuki Sako, D. Yu Peressounko, Xiong Wang, Alexander Malakhov, Qiao Xu, Dong Jo Kim, D. Silvermyr, L. S. Zolin, W. J. Park, S. H. Lim, P. D. Barnes, A. Yanovich, J. Chiba, Alice Mignerey, M. Wysocki, M. Mitrovski, J. Huang, Takao Sakaguchi, I. Tserruya, Yu. Efremenko, C. Klein-Boesing, A. D. Frawley, Prakhar Garg, V. Singh, A. Hodges, S. H. Aronson, W. Holzmann, S. F. Pate, Maya Hachiya Shimomura, Y. I. Makdisi, S. Butsyk, Vladimir Samsonov, H. Al-Bataineh, A. Glenn, P. V. Radzevich, M. J. Tannenbaum, B. K. Schmoll, Eunja Kim, D. Ivanishchev, Jaehyeok Yoo, D. Mukhopadhyay, S. Rembeczki, V. Papavassiliou, Sébastien Gadrat, Alexander Milov, I. Nakagawa, C. E. Perezlara, Eva Haslum, O. Drapier, Frank Ellinghaus, B. Lenzi, E. R. Kinney, Robert F. Hobbs, D. P. Morrison, V. E. Semenov, Tatsuya Chujo, S. Afanasiev, Tamas Ferenc Csorgo, A. Ster, N. Feege, S. I. Morrow, J. Newby, Debashish Pal, S. Sawada, J. Ying, A. Franz, J. Runchey, B. M. Johnson, J. L. Nagle, D. Hornback, C. Silvestre, A. Taranenko, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Kazushi Miki, T. A. Shibata, D. Kincses, Min Soo Kim, D. Isenhower, A. Toia, Tamas Novak, T. Moon, L. Mašek, J. L. Charvet, Rushan Han, T. E. Miller, Kei Nagashima, V. Canoa Roman, P. Chung, Raphael Noel Tieulent, Susumu Sato, W. S. Emam, H. Kanou, Taku Gunji, H. Gong, J. Seele, M. Patel, F. Kajihara, H. Delagrange, S. Zhou, M. Virius, S. Takagi, M. Boer, Sándor Lökös, K. N. Barish, S. Zharko, M. L. Brooks, B. Love, Y. L. Yamaguchi, C. Xu, A. G. Litvinenko, A. Kozlov, R. Seto, K. Haruna, T. W. Danley, X. He, J. Zimamyi, O. O. Omiwade, V. Peresedov, S. Batsouli, H. Masui, A. K. Dubey, A. A. Bickley, N. Grau, K. Shoji, W. Peng, and P. W. Stankus

Subjects
Physics, Photon, Mass distribution, 010308 nuclear & particles physics, Hadron, Virtual particle, 01 natural sciences, Spectral line, Nuclear physics, Momentum, 0103 physical sciences, Mass spectrum, Rapidity, Nuclear Experiment, 010306 general physics
Abstract

We measured direct photons for pT

Published
2018
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7. Measurement of the Vector Meson Spectral Modification in the Nuclear Medium at J-PARC

Author

Tomonori Takahashi, Wataru Nakai, Hideki Hamagaki, Koki Kanno, Hikari Murakami, Megumi Naruki, Kazuya Aoki, Tatsuya Chujo, Y. Obara, Yuhei Morino, S. Sawada, Michiko Sekimoto, Hitoshi Sugimura, Hiroyuki Sako, Y. Komatsu, Yosuke Watanabe, Fuminori Sakuma, H. En'yo, S. Ashikaga, Takuya Shibukawa, Akio Kiyomichi, Kenta Shigaki, Hiroyuki Noumi, S. Miyata, Susumu Sato, Ryotaro Honda, S. Yokkaichi, Shunichi Esumi, Takao Sakaguchi, K. Ozawa, and Ryotaro Muto

Subjects
Physics, Quark, Particle physics, Meson, 010308 nuclear & particles physics, Hadron, Elementary particle, Nuclear matter, 01 natural sciences, Spectral line, 0103 physical sciences, J-PARC, Vector meson, 010306 general physics
Published
2017
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8. Scaling properties of fractional momentum loss of high-pThadrons in nucleus-nucleus collisions atsNNfrom 62.4 GeV to 2.76 TeV

Author

V. I. Kochetkov, Gerd Joachim Kunde, I. Shein, K. Sedgwick, Mihael Makek, Sung Keun Park, L. Guo, Y. Watanabe, N. N. Ajitanand, Alexei Khanzadeev, M. Tomášek, M. Rosati, Tamás Csörgő, Paul Constantin, G. D. N. Perera, A. Soldatov, Takahiro Nakamura, M. Grosse Perdekamp, G. S. Kyle, Shinichi Masumoto, E. Stenlund, M. E. Connors, S. Huang, Mate Csanad, A. A. Vinogradov, Susumu Oda, S. K. Park, A. Durum, Jiangyong Jia, M. Naglis, Y. Goto, H. Nakagomi, T. Hoshino, C. L. Silva, D. H. Kim, K. Yamaura, H. Sakata, J. M. Durham, J. H. Do, C. L. Towell, Susumu Sato, A. Yu. Semenov, A. Hadj Henni, M. Proissl, D. Kleinjan, D. Winter, D. Yu Peressounko, J. Bryslawskyj, I. Danchev, Dennis Perepelitsa, Byung-Sik Hong, Atsushi Takahara, P. Tarján, T. Niida, A. Lebedev, Beomkyu Kim, Wei Xie, Maya Hachiya Shimomura, A. Bazilevsky, Vardan Khachatryan, M. Nihashi, A. Meles, Yuhei Morino, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, S. Wolin, Y. I. Makdisi, Shunji Nishimura, K. A. Drees, N. Kamihara, T. E. Miller, T. Tabaru, T. Murakami, E. M. Takagui, David D'Enterria, F. Staley, Hongfang Liu, D. E. Fields, A. Deshpande, S. F. Pate, T. V. Moukhanova, Hiromi Iinuma, F. Matathias, R. Armendariz, Senta Greene, H. W. Yu, K. S. Sim, O. Dietzsch, K. Watanabe, Kei Nagashima, A. Baldisseri, Christian Klein-Boesing, M. McCumber, A. K. Purwar, Byoungchoo Park, R. P. Pisani, J. Rak, R. Belmont, R. Tanabe, S. Bathe, A. Drees, S. Yokkaichi, G. W. Kim, P. Chung, B. E. Norman, D. M. Lee, E. T. Atomssa, H. Valle, H. Van Hecke, J. Imrek, Agneta Oskarsson, I. J. Choi, B. Xia, M. J. Tannenbaum, Alberica Toia, Tae-Yeon Lee, Dipanwita Dutta, Robert F. Hobbs, E. O'Brien, B. K. Schmoll, S. Takagi, Raphael Noel Tieulent, Min-Hye Kim, Junji Tojo, J. Klatsky, J. B. Choi, C. Gal, J. Kubart, J. L. Klay, M. N. Wagner, W. S. Emam, Y. Berdnikov, M. Kawashima, Y. Fukao, A. Shevel, K. Kiriluk, Y. Ikeda, J. G. Boissevain, Masashi Kaneta, S. H. Lee, Y. Akiba, Anand Kumar Dubey, Barbara Jacak, S. Dairaku, Julia Velkovska, S. Kanda, Yongsun Kim, E. Tennant, S. Rembeczki, C. Silvestre, C. McKinney, S. V. Afanasiev, Martin Purschke, H. Sako, Rushan Han, M. Mishra, Brennan Schaefer, S. Nagamiya, T. Hester, R. S. Hollis, P. W. Stankus, E. P. Hartouni, Y. J. Kwon, M. Chiu, Ajit Kumar Mohanty, Z. Rowan, Tomoya Tsuji, T. A. Shibata, M. B. Deaton, M. K. Mitrovski, L. Aphecetche, C. A. Aidala, M. Mendoza, T. Sato, C. Baumann, S. Kametani, N. S. Bandara, Kensuke Homma, B. Kimelman, Vladimir Samsonov, Christine Nattrass, S. N. White, R. Akimoto, M. Patel, Y. Tanaka, E. Mannel, R. Yang, H. Hiejima, X. Jiang, C. Pinkenburg, C. P. Singh, N. A. Sparks, Christophe Pierre Suire, Alexander Milov, I. Nakagawa, R. Luechtenborg, Young-Ki Kim, T. Engelmore, N. Novitzky, K. N. Barish, C. A. Ogilvie, Kisung Lee, T. K. Hemmick, Bhawani Singh, M. K. Lee, K. Imai, Vaclav Vrba, Klaus Johannes Reygers, Astrid Morreale, Rui Wei, O. Zaudtke, J. S. Kang, K. O. Eyser, D. Isenhower, Tamas Novak, T. Moon, L. Mašek, D. Kotchetkov, A. Kiss, B. J. Ramson, Yasuo Miake, O. Drapier, V-N. Tram, N. Grau, Y. Onuki, M. Leitgab, Shuo Han, Johannes Peter Wessels, M. Stepanov, G. Roche, A. Iordanova, J. Murata, Zvi Hirsh Citron, M. Javani, Nagahiro Saito, P. Montuenga, C. R. Cleven, I. Younus, C. Haegemann, Y. Inoue, Tomofumi Nagae, J. L. Nagle, Yu. Efremenko, C. L. Woody, A. Berdnikov, B. M. Johnson, E. R. Kinney, Filip Krizek, V. S. Pantuev, S. Sawada, P. Castera, H. Ge, K. Das, Z. Yasin, Henner Buesching, Peter Christiansen, M. Sano, Steve Edwards, K. Nakano, E. Richardson, S. Chernichenko, J. H. Kang, Y. Miyachi, Motoi Inaba, J. C. Hill, J. S. Haggerty, Z. Fraenkel, S. R. Lee, J. Hamblen, H. Kanou, Torsten Dahms, H. J. Moon, A. Romana, R. Lacey, D. P. Morrison, K. DeBlasio, T. Kempel, L. Baksay, R. M. Wright, Jong-Min Park, Taku Gunji, H. Gong, S. Campbell, K. B. Kim, J. Ying, A. Franz, F. Kajihara, B. H. Kang, A. Isupov, A. Basye, M. Virius, L. Kochenda, M. Issah, Manabu Togawa, R. Granier de Cassagnac, M. S. Daugherity, W. E. Sondheim, A. Adare, X. Gong, Shoichi Hasegawa, H. Delagrange, R. K. Choudhury, B. Bassalleck, K. Okada, Steven E. Skutnik, Eun Joo Kim, Ferdinando Giordano, Charles Maguire, B. Sahlmueller, H. En'yo, R. Pinson, Don McGlinchey, B. Azmoun, Y. J. Mao, V. E. Semenov, Y. Komatsu, S. Choi, S. Butsyk, A. Král, J. Sziklai, L. A. Linden Levy, M. J. Leitch, M. J. Kweon, T. O. S. Haseler, S. Sano, K. Boyle, P. A. Rukoyatkin, H. Al-Ta'Ani, Tatsuya Chujo, J. D. Orjuela Koop, H. Qu, P. B. Diss, S. Zhou, P. Rosnet, S. D. Rolnick, S. Taneja, Petr Gallus, Osamu Jinnouchi, Brian Cole, R. S. Towell, K. Fujiwara, K. Sakashita, D. Kotov, C. H. Chen, M. Konno, B. Komkov, Kenjiro Miki, Y. S. Lai, K. Karatsu, K. Dehmelt, Hideki Hamagaki, K. Aoki, M. Vargyas, G. David, T. Todoroki, K. I. Hahn, Bruno Lenzi, E. Kistenev, Y. L. Yamaguchi, D. Mukhopadhyay, Frank Ellinghaus, Matthew G. Reuter, Takahiro Fusayasu, I. Garishvili, Akio Kiyomichi, Jen-Chieh Peng, F. Wei, Dmitry Blau, Y. Hori, Anne Marie Sickles, A. Manion, E. Leitner, H. Themann, K. Gainey, J. Egdemir, Jason Kamin, J. Huang, S. Mizuno, Tsutomu Mibe, M. A. L. Leite, E. J. Desmond, J. Hanks, Bum-Hoon Lee, Alexander Malakhov, J. S. Bok, I. Ravinovich, D. Reynolds, P. Kline, K. S. Lee, A. Dion, E. Vazquez-Zambrano, N. Kurihara, A. Nederlof, Y. Nakamiya, D. Lynch, H. Harada, A. Garishvili, Y. Nagata, S. P. Stoll, J. Ide, Prakhar Garg, M. Wysocki, D. Silvermyr, Inkyu Park, A. Rakotozafindrabe, S. H. Lim, M. Kasai, M. Bai, Y. Tsuchimoto, B. Bannier, G. R. Young, M. Gonin, Xiong Wang, E. C. Aschenauer, J. Chiba, L. S. Zolin, I. E. Yushmanov, Animesh Datta, T. Sumita, J. S. Kapustinsky, S. S.E. Rosendahl, G. Bunce, Alice Mignerey, J.-G. Park, L. D'Orazio, S. Miyasaka, C. Y. Chi, G. Baksay, W. J. Park, Christopher Rosen, C. M. Camacho, Prashant Shukla, Pawan Kumar Netrakanti, I. V. Sourikova, V. Babintsev, Dong Jo Kim, P. Liebing, P. D. Barnes, A. Yanovich, Aaron White, M. Beaumier, S. Belikov, K. S. Joo, K. Shoji, A. Churyn, Ke. Nakamura, A. Sukhanov, K. Kurita, Takao Sakaguchi, A. Sen, M. L. Brooks, M. Kurosawa, D. Hornback, Matthew Snowball, J. H. Yoo, J. D. Osborn, H. Al-Bataineh, Inseok Yoon, Zhiying You, D. K. Mishra, D. Jouan, A. D. Frawley, J. G. Rubin, B. Meredith, J. A. Key, R. Bennett, J. Sun, B. Lewis, S. H. Aronson, T. L.T. Thomas, C. O. Kim, N. Apadula, S. Motschwiller, R. Pak, A. Veicht, X. He, J. Zimamyi, S. Tarafdar, M. Finger, John Wood, H. A. Torii, D. Ivanishchev, V. Papavassiliou, W. Holzmann, H. F. Hamilton, J. E. Frantz, Jongmin Lee, I. Tserruya, Toru Sugitate, L. D. Isenhower, S. Kaneti, S. P. Sorensen, Sébastien Gadrat, D. Pal, Dylan Walker, J. Jin, A. Vossen, R. Petti, M. Jezghani, O. O. Omiwade, O. Chvala, Seong H. Kim, J. T. Mitchell, V. Singh, J. G. Lajoie, M. Alfred, T. Hachiya, S. Esumi, S. Lee, Jennifer E. Perry, A. Enokizono, Y. Aramaki, D. Sharma, R. Ichimiya, François Fleuret, A. Kravitz, N. Hotvedt, R. Seidl, Hiroaki Ohnishi, K. B. Lee, T. Koblesky, Vladislav Manko, A. Taketani, Priyanka Sett, H. Asano, V. Peresedov, Robert Vertesi, D. S. Jumper, Makoto Oka, M. Sarsour, V. L. Rykov, L. Ding, S. Mioduszewski, D. Roach, K. M. Kijima, J. Gosset, H. Pei, Eva Haslum, K. Hashimoto, A. Glenn, Xingguo Li, C. Vale, J. Koster, Eunja Kim, B. S. Chang, A. Timilsina, Timothy Thomas Rinn, H. J. Kim, H. Masui, A. Ster, N. Feege, A. A. Bickley, J. Newby, A. Mwai, B. Love, Tadaaki Isobe, A. G. Litvinenko, M. Slunečka, A. Taranenko, J. L. Charvet, A. Sexton, T. Horaguchi, P. L. McGaughey, A. Kozlov, R. Seto, K. Haruna, T. W. Danley, S. Beckman, Ralf Peter Averbeck, J. Seele, B. Fadem, V. Dzhordzhadze, L. Zou, M. Ouchida, S. Baumgart, Masamichi Ishihara, N. Means, Minghui Liu, J. Asai, M. Heffner, Kenneth Francis Read, H. Pereira, Shingo Sakai, T. Ichihara, A. V. Kazantsev, L. Tomášek, Ryugo S. Hayano, P. Mikeš, Y. Riabov, Kenta Shigaki, M. Nguyen, A. S. Nyanin, Rachid Nouicer, A. N. Zelenski, L. Patel, T. C. Awes, Kyoichiro Ozawa, T. Liška, Jun Kikuchi, Serpil Yalcin, Aaron Angerami, W. A. Zajc, L. Xue, V. Baublis, A. Denisov, Yuki Watanabe, V. Cianciolo, Sergey Fokin, S. Batsouli, K. V. Dharmawardane, R. A. Soltz, R. Kitamura, A. P.T. Palounek, J. Alexander, H. A. Gustafsson, S. R. P. Mohapatra, C. Zhang, P. Ružička, H. Borel, Viktor Riabov, M. I. Nagy, D. Watanabe, Marcus Hohlmann, M. D. Malik, E. Vznuzdaev, D. Kawall, and K. Tanida

Subjects
Quark, Physics, Particle physics, 010308 nuclear & particles physics, Hadron, Parton, 16. Peace & justice, 7. Clean energy, 01 natural sciences, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, Centrality, Relativistic Heavy Ion Collider, Glauber, Energy (signal processing)
Abstract

Measurements of the fractional momentum loss $({S}_{\mathrm{loss}}\ensuremath{\equiv}\ensuremath{\delta}{p}_{T}/{p}_{T})$ of high-transverse-momentum-identified hadrons in heavy-ion collisions are presented. Using ${\ensuremath{\pi}}^{0}$ in $\mathrm{Au}+\mathrm{Au}$ and $\mathrm{Cu}+\mathrm{Cu}$ collisions at $\sqrt{{s}_{{}_{NN}}}=62.4$ and 200 GeV measured by the PHENIX experiment at the Relativistic Heavy Ion Collider and and charged hadrons in $\mathrm{Pb}+\mathrm{Pb}$ collisions measured by the ALICE experiment at the Large Hadron Collider, we studied the scaling properties of ${S}_{\mathrm{loss}}$ as a function of a number of variables: the number of participants, ${N}_{\mathrm{part}}$, the number of quark participants, ${N}_{\mathrm{qp}}$, the charged-particle density, $d{N}_{\mathrm{ch}}/d\ensuremath{\eta}$, and the Bjorken energy density times the equilibration time, ${\ensuremath{\varepsilon}}_{\mathrm{Bj}}{\ensuremath{\tau}}_{0}$. We find that the ${p}_{T}$, where ${S}_{\mathrm{loss}}$ has its maximum, varies both with centrality and collision energy. Above the maximum, ${S}_{\mathrm{loss}}$ tends to follow a power-law function with all four scaling variables. The data at $\sqrt{{s}_{{}_{NN}}}=200$ GeV and 2.76 TeV, for sufficiently high particle densities, have a common scaling of ${S}_{\mathrm{loss}}$ with $d{N}_{\mathrm{ch}}/d\ensuremath{\eta}$ and ${\ensuremath{\varepsilon}}_{\mathrm{Bj}}{\ensuremath{\tau}}_{0}$, lending insight into the physics of parton energy loss.

Published
2016
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9. Transverse energy production and charged-particle multiplicity at midrapidity in various systems fromsNN=7.7to 200 GeV

Author

I. Garishvili, Akio Kiyomichi, F. Wei, N. Kurihara, Animesh Datta, T. Sumita, M. G. Hur, M. Kurosawa, J. H. Yoo, B. Lewis, J. M. Burward-Hoy, C. Baumann, S. Kametani, C. P. Singh, S. Hayashi, D. Pal, J. Jin, B. M. Johnson, Filip Krizek, K. Dehmelt, A. Isupov, J. Sziklai, Brian Cole, Mate Csanad, Jen-Chieh Peng, B. Voas, K. O. Eyser, Y. Onuki, J. L. Charvet, P. Tarján, Y. J. Mao, A. Král, S. Takagi, H. Van Hecke, S. Bathe, A. Nukariya, D. Reynolds, Inkyu Park, Xiong Wang, Z. Conesa del Valle, Dong Jo Kim, Y. Ikeda, T. Murakami, E. M. Takagui, R. Lacey, Atsushi Takahara, I. Ravinovich, M. Nihashi, Kensuke Homma, E. Richardson, K. N. Barish, Shunji Nishimura, M. Gonin, M. Patel, X. Jiang, Ryugo S. Hayano, J. G. Boissevain, T. E. Miller, Tadaaki Isobe, R. Granier de Cassagnac, A. Adare, J. S. Chai, Robert F. Hobbs, Min-Hye Kim, Y. Le Bornec, Masashi Kaneta, Alberica Toia, C. Silvestre, S. Chernichenko, R. A. Soltz, David D'Enterria, N. Crossette, H. Lim, A. Veicht, Charles Maguire, A. Kiss, M. Naglis, Y. Nagata, B. Bassalleck, Yuhei Morino, Steven Kelly, K. A. Drees, J. Rak, Y. Riabov, S. Sano, Kei Nagashima, R. P. Pisani, M. Bai, H. Nakagomi, M. Skolnik, T. Hoshino, G. W. Kim, P. Chung, A. Denisov, Marisilvia Donadelli, Kenta Shigaki, M. Konno, Torsten Dahms, M. Slunečka, V. Bumazhnov, M. P. Comets, J. Klatsky, D. Black, E. C. Aschenauer, R. Akimoto, S. S. Ryu, Hari Guragain, J. Imrek, M. Holmes, C. L. Silva, D. H. Kim, S. Sawada, K. Hasuko, Z. Yasin, B. Azmoun, G. C. Mishra, J. Ying, A. Franz, Christophe Pierre Suire, Alexander Milov, I. Nakagawa, P. L. McGaughey, M. Nguyen, Young-Ki Kim, Henner Buesching, Raphael Noel Tieulent, Nikolay Tyurin, T. Engelmore, N. Novitzky, Jihyun Bhom, J. B. Choi, W. S. Emam, Y. Nakamiya, D. Lynch, M. N. Wagner, M. Kawashima, Steve Edwards, S. Tarafdar, H. Pei, J. Chiba, Alice Mignerey, A. Sukhanov, K. Kurita, K. S. Sim, T. Tabaru, Y. Gu, H. Asano, R. S. Towell, Prashant Shukla, H. Kanou, Jong-Min Park, S. F. Pate, Y. Fukao, Y. J. Kwon, J. Alexander, Taku Gunji, H. Gong, M. I. Nagy, M. S. Daugherity, H. Pereira, F. Kajihara, A. S. Nyanin, G. Baksay, A. Shevel, A. Basye, Junji Tojo, C. Pinkenburg, O. Drapier, Frank Ellinghaus, Matthew Snowball, J. D. Osborn, Inseok Yoon, Zhiying You, S. Beckman, Eun Joo Kim, R. S. Hollis, Ferdinando Giordano, Ke. Nakamura, E. P. Hartouni, R. Bennett, H. Al-Bataineh, H. Delagrange, R. Tanabe, Y. Komatsu, B. Love, M. T. Bjorndal, T. Hester, L. D'Orazio, M. R. Stone, S. Miyasaka, R. Yang, J. A. Key, S. Butsyk, Rachid Nouicer, D. Watanabe, A. N. Zelenski, Hiromi Iinuma, H. Hiejima, D. S. Brown, Marcus Hohlmann, S. W. Nam, Ralf Peter Averbeck, S. Motschwiller, E. R. Kinney, Marie Germain, S. Zhou, Ahmed Al-Jamel, T. L.T. Thomas, M. Finger, W. C. Smith, J. M. Durham, H. A. Gustafsson, D. P. Morrison, J. E. Frantz, D. Ivanishchev, Jongmin Lee, S. D. Rolnick, Y. S. Kim, B. Komkov, M. D. Malik, X. Gong, Pawan Kumar Netrakanti, E. Vznuzdaev, V. Papavassiliou, Sébastien Gadrat, C.Y. Chi, Joakim Nystrand, J. H. Do, A. Iordanova, C. L. Towell, Susumu Sato, C. O. Kim, Senta Greene, J. T. Mitchell, K. Imai, Ajit Kumar Mohanty, S. Campbell, T. A. Shibata, M. Stepanov, G. Roche, T. Sato, Laurent Bernard Aphecetche, L. Zou, A. G. Litvinenko, P. Kline, K. S. Lee, Herve Borel, A. Dion, S. Taneja, Eva Haslum, B. H. Kang, J. Murata, V. E. Semenov, N. Hotvedt, R. Seidl, R. Pak, Aaron White, Norio Saito, Tsutomu Mibe, M. A. L. Leite, Hideyuki Oide, J. Huang, Bum-Hoon Lee, S. Solano, A. Isinhue, Vladislav Manko, S. Baumgart, A. Enokizono, D. Isenhower, Masamichi Ishihara, P. K. Khandai, M. K. Dayananda, Prakhar Garg, Margaret Harvey, A. Taketani, Priyanka Sett, K. Karatsu, Tamas Novak, T. Moon, L. Mašek, M. Wysocki, B. Bannier, V-N. Tram, N. Grau, M. K. Lee, Y. Hori, Anne Marie Sickles, H. Al-Ta'Ani, Tatsuya Chujo, I. Tserruya, J. Gosset, H. Themann, K. Gainey, Minghui Liu, Takao Sakaguchi, A. Sen, L. Guo, J. L. Klay, Alexei Khanzadeev, Barbara Jacak, D. S. Jumper, M. Leitgab, Shinichi Masumoto, Shuo Han, L. A. Linden Levy, S. Kaneti, Makoto Oka, S. P. Sorensen, M. S. Ryu, S. H. Lim, V. L. Rykov, B. E. Norman, J. P. Sullivan, J. P. Wessels, J. Seele, J. S. Kang, M. Heffner, A. Ster, N. Feege, Kenneth Francis Read, Rushan Han, M. N. Hagiwara, E. Stenlund, M. Jezghani, V. Singh, S. Huang, Timothy Thomas Rinn, H. J. Kim, Dylan Walker, R. Belmont, C. Vale, B. S. Chang, J. S. Bok, S. R. P. Mohapatra, T. Niida, E. O'Brien, Motoi Inaba, J. C. Hill, S. Dairaku, P. Liebing, T. Ichihara, N. S. Bandara, J. S. Kapustinsky, S. V. Afanasiev, H. Sakata, H. Sako, R. M. Wright, C. Zhang, A. Lebedev, A. Timilsina, Toshiki Maruyama, Christine Angela Aidala, J. Newby, O. Chvala, V. Babintsev, O. Zaudtke, M. Tomášek, M. Rosati, X. H. Li, Paul Constantin, Franz E. Bauer, T. Koblesky, M. Beaumier, M. Ouchida, S. Belikov, K. S. Joo, A. V. Kazantsev, Vladimir Samsonov, I. Otterlund, Christine Nattrass, A. Bazilevsky, K. Sakashita, Tamás Csörgő, A. D. Frawley, M. C. McCain, G. S. Kyle, N. Willis, N. Means, D. K. Mishra, P. Ružička, M. Virius, J. Asai, Manabu Togawa, V. S. Pantuev, Byung-Sik Hong, M. Sarsour, J. G. Lajoie, M. Grosse Perdekamp, J. G. Rubin, X. Bai, Y. Watanabe, L. Tomášek, G. R. Young, D. Kotov, J. Sun, M. Alfred, T. Hachiya, P. Mikeš, M. Sano, Agneta Oskarsson, S. Lee, J. Egdemir, Jennifer E. Perry, N. Apadula, M. E. Connors, Bruno Espagnon, H. W. Yu, Shingo Sakai, S. H. Aronson, S. K. Park, Viktor Riabov, Shoichi Hasegawa, J. D. Orjuela Koop, C. H. Chen, D. Mukhopadhyay, G. David, A. Vossen, Tomofumi Nagae, J. L. Nagle, L. Patel, S. Leckey, A. Shaver, A. Kravitz, Sung Keun Park, A. Taranenko, J. Hamblen, A. A. Vinogradov, D. M. Lee, Hiroaki Ohnishi, K. B. Lee, Henrik Tydesjö, S. P. Whitaker, A. Manion, S. H. Lee, Serpil Yalcin, G. H. Lee, Y. Cobigo, C. McKinney, S. Choi, P. Castera, A. Glenn, Hirohiko Sato, S. Yokkaichi, S. K. Tuli, J. M. Heuser, R. Petti, M. Mishra, Brennan Schaefer, S. Nagamiya, S. J. Jeon, Kazuhiro Tanaka, A. Soldatov, J. Bryslawskyj, Jiangyong Jia, Y. Goto, T. Horaguchi, Y. Sekiguchi, T. C. Awes, Kyoichiro Ozawa, T. Liška, Josh Moss, Aaron Angerami, D. Kawall, Jun Kikuchi, K. Tanida, N. N. Ajitanand, Vaclav Vrba, Klaus Johannes Reygers, Astrid Morreale, Jason Kamin, T. V. Moukhanova, S. Esumi, Eunja Kim, Kenjiro Miki, H. Obayashi, David Olle Rickard Silvermyr, Bruno Lenzi, Rui Wei, W. Holzmann, H. F. Hamilton, D. Sharma, E. Kistenev, Maya Hachiya Shimomura, V. I. Kochetkov, C. L. Woody, Vardan Khachatryan, A. Berdnikov, W. A. Zajc, Yu. Efremenko, M. Proissl, P. Rosnet, L. Ding, Dmitry Blau, S. Mioduszewski, M. Kofarago, D. Kleinjan, L. Xue, K. Fujiwara, R. Ichimiya, D. Winter, D. Yu Peressounko, Y. I. Makdisi, D. Roach, K. M. Kijima, P. Lichtenwalner, G. D. N. Perera, V. Baublis, Yuki Watanabe, Y. L. Yamaguchi, V. Cianciolo, Zvi Hirsh Citron, Dennis Perepelitsa, H. Harada, K. Hashimoto, S. P. Stoll, E. J. Desmond, Sergey Fokin, J. H. Kang, Y. Miyachi, A. Caringi, J. S. Haggerty, Takahiro Nakamura, Tae-Yeon Lee, S. R. Lee, A. Romana, Xingguo Li, Gerd Joachim Kunde, Martin Purschke, F. Gastineau, S. Mizuno, I. Shein, K. Okada, T. W. Jones, Petr Gallus, J. Hanks, M. B. Deaton, E. Vazquez-Zambrano, A. Nederlof, B. Sahlmueller, Y. Berdnikov, O. Dietzsch, A. Garishvili, A. Hadj Henni, I. Danchev, E. T. Atomssa, Gary Grim, H. Valle, K. Sedgwick, H. En'yo, I. V. Sourikova, Dipanwita Dutta, S. Batsouli, K. V. Dharmawardane, A. Rakotozafindrabe, Y. Tanaka, Susumu Oda, E. Mannel, T. K. Shea, J. L. Drachenberg, Alberto Baldisseri, Mihael Makek, C. Gal, M. J. Leitch, M. J. Kweon, Julia Velkovska, Y. S. Lai, D. Kotchetkov, Beomkyu Kim, M. Javani, T. Shohjoh, M. Kasai, Y. Tsuchimoto, Y. Iwanaga, S. S.E. Rosendahl, M. J. Tannenbaum, H. J. Moon, F. Staley, L. Baksay, Wei Xie, A. Deshpande, A. Durum, M. Moskowitz, I. E. Yushmanov, G. Bunce, R. Kitamura, Z. Fraenkel, B. K. Schmoll, J.-G. Park, N. Cronin, A. P.T. Palounek, E. Tennant, I. J. Choi, S. Rembeczki, B. Xia, R. K. Choudhury, D. Bucher, K. Yamaura, A. Meles, Osamu Jinnouchi, P. Steinberg, Matthew G. Reuter, Takahiro Fusayasu, I. D. Ojha, Alexander Malakhov, L. S. Zolin, W. J. Park, Christopher Rosen, P. D. Barnes, A. Yanovich, Z. Rowan, Tomoya Tsuji, M. Mendoza, M. L. Brooks, S. N. White, Deepa Thomas, H. Ge, K. Das, K. Nakano, K. B. Kim, W. E. Sondheim, K. Boyle, P. A. Rukoyatkin, D. Hornback, S. Y. Fung, A. Churyn, D. Danley, B. Meredith, Hongfang Liu, D. E. Fields, H. A. Torii, Toru Sugitate, L. D. Isenhower, D. Jouan, M. McCumber, A. K. Purwar, N. Riveli, François Fleuret, B. Forestier, M. Chiu, M. K. Mitrovski, C. A. Ogilvie, T. K. Hemmick, Bhawani Singh, B. J. Ramson, Yasuo Miake, K. DeBlasio, L. Kochenda, M. Issah, R. Pinson, Y. Akiba, Don McGlinchey, T. Kawagishi, S. Wolin, K. Watanabe, Christian Klein-Boesing, N. Kamihara, Aram Kim, F. Matathias, R. Armendariz, Byoungchoo Park, K. Shoji, Anand Kumar Dubey, C. Oakley, A. Drees, J. Kubart, S. Kanda, Yongsun Kim, P. W. Stankus, B. Kimelman, J. Midori, P. Montuenga, C. R. Cleven, I. Younus, C. Haegemann, Y. Inoue, Peter Christiansen, P. J. Kroon, T. Kempel, Y. Imazu, Steven E. Skutnik, T. O. S. Haseler, H. Qu, P. B. Diss, Hideki Hamagaki, K. Aoki, M. Vargyas, T. Todoroki, K. I. Hahn, A. Sexton, A. Kozlov, R. Seto, K. Haruna, B. Fadem, V. Dzhordzhadze, X. He, J. Zimamyi, O. O. Omiwade, Y. Aramaki, V. Peresedov, Robert Vertesi, J. Koster, H. Masui, A. A. Bickley, and A. Mwai

Subjects
Physics, Particle physics, 010308 nuclear & particles physics, Critical phenomena, Constituent quark, Kinetic energy, 01 natural sciences, Charged particle, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Nucleon, Glauber
Abstract

Measurements of midrapidity charged particle multiplicity distributions, $dN_{\rm ch}/d\eta$, and midrapidity transverse-energy distributions, $dE_T/d\eta$, are presented for a variety of collision systems and energies. Included are distributions for Au$+$Au collisions at $\sqrt{s_{_{NN}}}=200$, 130, 62.4, 39, 27, 19.6, 14.5, and 7.7 GeV, Cu$+$Cu collisions at $\sqrt{s_{_{NN}}}=200$ and 62.4 GeV, Cu$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV, U$+$U collisions at $\sqrt{s_{_{NN}}}=193$ GeV, $d$$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV, $^{3}$He$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV, and $p$$+$$p$ collisions at $\sqrt{s_{_{NN}}}=200$ GeV. Centrality-dependent distributions at midrapidity are presented in terms of the number of nucleon participants, $N_{\rm part}$, and the number of constituent quark participants, $N_{q{\rm p}}$. For all $A$$+$$A$ collisions down to $\sqrt{s_{_{NN}}}=7.7$ GeV, it is observed that the midrapidity data are better described by scaling with $N_{q{\rm p}}$ than scaling with $N_{\rm part}$. Also presented are estimates of the Bjorken energy density, $\varepsilon_{\rm BJ}$, and the ratio of $dE_T/d\eta$ to $dN_{\rm ch}/d\eta$, the latter of which is seen to be constant as a function of centrality for all systems.

Published
2016
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10. A compact X-ray free-electron laser emitting in the sub-ångström region

Author

Noritaka Kumagai, Shinichi Matsubara, Takao Asaka, Shinsuke Suzuki, Yukito Furukawa, Hiromitsu Tomizawa, Miho Ishii, Shukui Wu, Kei Sawada, Sunao Takahashi, Sakuo Matsui, Kenji Tamasaku, Kenji Fukami, Hitoshi Tanaka, Kunikazu Takeshita, T. Seike, Atsushi Tokuhisa, Noriyoshi Azumi, Hiroaki Kimura, Nobuteru Nariyama, Tetsuya Ishikawa, Takahiro Sato, Teruaki Hasegawa, Hideo Kitamura, Tsumoru Shintake, Shun Ono, Toru Ohata, Yoshihiro Asano, Akihiro Yamashita, Hirokazu Maesaka, Haruhiko Ohashi, Mitsuhiro Yamaga, T. Hirono, H. Ego, Takemasa Masuda, Yuji Otake, Naoyasu Hosoda, Makina Yabashi, Tatsuyuki Sakurai, Takaki Hatsui, Yoichi Kirihara, Mitsuru Nagasono, Takashi Kameshima, Atsushi Higashiya, Hideki Takebe, Chikara Kondo, Kazuaki Togawa, Yuichi Inubushi, Akio Kiyomichi, Choji Saji, Takashi Ohshima, Katsutoshi Shirasawa, Shunji Goto, Togo Kudo, Xavier Maréchal, Takahiro Matsumoto, Toshiro Itoga, Kenichi Yanagida, Yasumasa Joti, T. Bizen, Tadashi Togashi, Hirofumi Hanaki, Kensuke Tono, Toru Hara, Chao Zhang, Takahiro Inagaki, Ryotaro Tanaka, Toru Fukui, Hideki Aoyagi, Masahiro Kago, Tomohiro Matsushita, T. Kobayashi, Takashi Tanaka, and Takashi Sugimoto

Subjects
Physics, Maximum power principle, business.industry, Free-electron laser, Physics::Optics, Pulse duration, Laser, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Gain-switching, law.invention, SACLA, Optics, law, Optoelectronics, Laser power scaling, business, Lasing threshold
Abstract

Researchers report sub-angstrom fundamental-wavelength lasing at the SPring-8 Angstrom Compact Free-Electron Laser in Japan. The output has a maximum power of more than 10 GW, a pulse duration of 10−14 s and a lasing wavelength of 0.634 A.

Published
2012
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11. Manufacturing and Operation of the Magnetic Septa for the Slow Beam Extraction From the J-PARC 50 GeV Proton Synchrotron

Author

Akio Kiyomichi, Hikaru Sato, S. Sawada, Jun-ichi Odagiri, Ryotaro Muto, Masahito Tomizawa, Kuanjun Fan, Shigeru Murasugi, Katsuya Okamura, Yoshitugu Arakaki, Izumi Sakai, Eiichi Yanaoka, Shuichi Tokumoto, Hiroshi Matsumoto, Yoshihisa Shirakabe, Hitoshi Kobayashi, Hidetoshi Nakagawa, Kazuhiro Tanaka, and Koji Ishii

Subjects
Physics, Range (particle radiation), Proton, Proton Synchrotron, Particle accelerator, Condensed Matter Physics, Synchrotron, Electronic, Optical and Magnetic Materials, law.invention, Nuclear physics, law, Magnet, Physics::Accelerator Physics, J-PARC, Electrical and Electronic Engineering, Beam (structure)
Abstract

The magnetic septa have been developed for the slow beam extraction from the 50 GeV Proton Synchrotron to the Hadron Experimental Hall at J-PARC (Japan Proton Accelerator Research Complex). The magnetic septa consist of two thin magnetic septa, four medium thick magnetic septa and four thick magnetic septa. The typical operating current is 3000 A and the total kick angle is 77 mrad with the 30 GeV proton beam. All parts of the thin and of the medium thick septum magnets are made of inorganic materials to resist high radiation environment. The positions of the thin and medium thick septa can be aligned remotely in the horizontal range of ±5 mm, which enables us to minimize the beam loss at the magnetic septum section. The septa were installed in the synchrotron ring in December, 2008, after a test at KEK (High Energy Accelerator Research Organization), and were successfully operated in the beam time for the slow beam extraction in January and February, 2009, which resulted in the first 30 GeV slow extracted beam delivery to the Hadron Experimental Hall.

Published
2010
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12. Indirectly Cooled Radiation-Resistant Magnets for Hadron Target Station at J-PARC

Author

Hitoshi Takahashi, Keizo Agari, M. Saijyo, Akio Kiyomichi, Yoshihisa Shirakabe, Ryotaro Muto, Yutaka Yamanoi, Michifumi Minakawa, Yoshihiro Suzuki, Hiroaki Watanabe, Minoru Takasaki, Y. Saitoh, Erina Hirose, Hiroyuki Noumi, K. Ogata, Megumi Naruki, S. Sawada, Akihiro Toyoda, Masami Iio, Masaharu Ieiri, K. Katoh, Yoichi Sato, Kazuhiro Tanaka, Y. Katoh, and K. Yahata

Subjects
Materials science, Nuclear engineering, Superconducting magnet, Condensed Matter Physics, Linear particle accelerator, Electronic, Optical and Magnetic Materials, Nuclear magnetic resonance, Electromagnetic coil, Magnet, Physics::Accelerator Physics, Vacuum chamber, Electrical and Electronic Engineering, Quadrupole magnet, Beam (structure), Electronic circuit
Abstract

The target station in the hadron experimental facility at J-PARC consists of a production target and a huge vacuum chamber in which several secondary-beam-line magnets can work. This vacuum chamber system aims to remove the vacuum beam pipe from the magnet gap, because the cooling of the beam pipe is the most serious problem in the high intensity beam facility. We have developed indirectly cooled radiation-resistant magnets for the hadron target station. Their coils are made of solid-conductor type mineral-insulation cables and stainless-steel water pipes. They have the great advantages that electric circuits can be completely independent of water pass. The mechanical strength and the insulation performance of the coil are significantly improved also because the insulation water pipes can be avoided from the water pass. A C-type sector dipole and a figure-8-type quadrupole magnet have been fabricated by using indirectly cooled radiation-resistant magnet technology, and installed in the vacuum chamber. We have succeeded to operate them in vacuum stably with the current of DC 1000 A by improving the end structure of the MIC coils and increasing their emissivity. These magnets have been used for the real beam operation without any serious problems.

Published
2010
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13. Radiation-Resistant Magnets for Hadron Experimental Hall of J-PARC

Author

Yoshihiro Suzuki, T. Ozawa, Ryotaro Muto, Y. Katoh, Minoru Takasaki, S. Sawada, Akihiro Toyoda, Megumi Naruki, Hiroyuki Noumi, M. Saijyo, Hiroaki Watanabe, T. Birumachi, Y. Saitoh, K. Yahata, Erina Hirose, Michifumi Minakawa, Keizo Agari, Yutaka Yamanoi, Kazuhiro Tanaka, Masami Iio, Akio Kiyomichi, K. Kato, Masaharu Ieiri, Hiroyuki Satoh, Hitoshi Takahashi, and Yoichi Sato

Subjects
Physics, Electromagnet, Proton Synchrotron, Particle accelerator, Condensed Matter Physics, Synchrotron, Electronic, Optical and Magnetic Materials, law.invention, Nuclear physics, law, Magnet, Physics::Accelerator Physics, J-PARC, Electrical and Electronic Engineering, Nuclear Experiment, Particle beam, Beam (structure)
Abstract

More than 50 radiation-resistant electromagnets were constructed for the primary proton and the secondary particle beam lines of the Hadron Experimental Hall of Japan Proton Accelerator Research Complex (J-PARC). The main radiation-resistant technologies we employed were the Polyimide-resin Insulation conductor for magnets at the relatively low radiation exposure and the Mineral Insulation Cable for magnets at the seriously high radiation environment. The remote handling and maintenance scheme of radiation-resistant magnets for seriously high radiation environment was developed also based on the Chimney magnet technology and applied to magnets near the production target in the Hadron Hall. On January 27th 2009, the first proton beam was successfully introduced to the Hadron Hall from the main accelerator of J-PARC, i.e. 50 GeV Proton Synchrotron. On February 10th, the secondary particles were extracted to the experimental area of the Hadron Hall through the secondary particle beam line. No serious problem happened on magnets of both primary proton and the secondary particle beam lines until the end of the beam operation scheduled on February 26th .

Published
2010
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14. Photoproduction of J/ψ and of high mass e+e− in ultra-peripheral Au + Au collisions at sNN=200 GeV

Author

T. L. Thomas, R. Vértesi, Masamichi Ishihara, Kensuke Homma, J. M. Heuser, Ryugo S. Hayano, J. Gosset, M. Gonin, J. P. Sullivan, S. Chernichenko, Y. Riabov, Minghui Liu, Kenta Shigaki, H. Lim, K. Hasuko, B. Bassalleck, M. Nguyen, A. S. Nyanin, Hiroyuki Okada, K. Kurita, M. Heffner, Kenneth Francis Read, T. Ichihara, H. Pereira, J. Murata, J. Chiba, M. Konno, J. M. Burward-Hoy, Joakim Nystrand, Eva Haslum, P. Tarján, G. C. Mishra, E. J. Desmond, Takao Sakaguchi, M. Togawa, S. Kelly, V. Bumazhnov, M. P. Comets, J. Park, Y. J. Kwon, W. C. Smith, Florian Bauer, S. Bathe, S. Yokkaichi, N. N. Ajitanand, C. Klein-Boesing, Y. Tsuchimoto, A. D. Frawley, Robert F. Hobbs, M. Rosati, T. Tabaru, J. L. Drachenberg, Y. Berdnikov, I. E. Yushmanov, Eun-Hee Kim, S. Y. Fung, M. K. Lee, Takahiro Nakamura, Alexei Khanzadeev, I. Tserruya, T. V. Moukhanova, S. H. Aronson, Y. Akiba, S. Nagamiya, J. T. Mitchell, S. Kametani, Senta Greene, S. P. Sorensen, Yu. Efremenko, B. Komkov, Hans-Åke Gustafsson, A. A. Vinogradov, K. Das, Henrik Tydesjö, T. Shohjoh, A. Ster, W. Holzmann, Kazuhiro Tanaka, C. A. Ogilvie, Jiangyong Jia, Tadaaki Isobe, Vladislav Manko, Evert Anders Stenlund, Debashish Pal, V. Singh, J. S. Chai, Norio Saito, T. K. Hemmick, M. A. L. Leite, A. Durum, J. H. Kang, J. S. Haggerty, S. Sawada, E. P. Hartouni, A. Hadj Henni, J. Newby, G. Roche, Yasuo Miake, Maya Hachiya Shimomura, B. E. Norman, Y. Tanaka, A. Franz, Y. Goto, John Hill, H. A. Torii, L. Kochenda, Y. I. Makdisi, A. Romana, E. O'Brien, P. L. McGaughey, D. S. Brown, M. N. Hagiwara, Wei Xie, Shingo Sakai, C. L. Woody, S. Gadrat, Toru Sugitate, T. Kawagishi, B. Azmoun, J. G. Lajoie, T. Hachiya, David D'Enterria, R. A. Soltz, H. Borel, A. V. Kazantsev, C. Vale, Ingvar Otterlund, B. Espagnon, Klaus Johannes Reygers, Anders Nils Erik Oskarsson, I. J. Choi, Christine Angela Aidala, M. J. Tannenbaum, S. Batsouli, M. Grosse Perdekamp, V. Babintsev, L. D. Isenhower, Hiroaki Ohnishi, T. K. Shea, R. P. Pisani, A. Taranenko, D. Mukhopadhyay, M. J. Kweon, G. S. Kyle, François Fleuret, N. Kamihara, F. Matathias, R. Armendariz, O. Dietzsch, H. Valle, D. Bucher, N. Willis, D. E. Fields, I. V. Sourikova, Osamu Jinnouchi, Y. Le Bornec, B. V. Jacak, S. V. Afanasiev, L. Aphecetche, James Alexander, Matthew G. Reuter, A. Drees, T. C. Awes, Kyoichiro Ozawa, R. Averbeck, Byung-Sik Hong, Nikolay Tyurin, M. C. McCain, J. G. Boissevain, A. Bazilevsky, M. N. Wagner, Masashi Kaneta, B. Forestier, M. T. Bjorndal, I. D. Ojha, Alexander Malakhov, A. K. Purwar, Julia Velkovska, J. Egdemir, A. P.T. Palounek, H. Pei, M. Wysocki, D. Winter, D. Silvermyr, D. Yu Peressounko, P. Rosnet, Y. Fukao, Xingguo Li, Alexandre Lebedev, D. M. Lee, L. S. Zolin, C. Pinkenburg, Johannes Peter Wessels, M. Csanad, S. P. Stoll, W. J. Park, R. S. Towell, S. S.E. Rosendahl, G. Bunce, P. D. Barnes, A. Yanovich, M. Stepanov, Akio Kiyomichi, C. Zhang, Hirohiko Sato, A. Dion, M. Issah, S. F. Pate, D. Jouan, Margaret Harvey, V-N. Tram, S. N. White, N. Kurihara, M. D. Malik, E. Vznuzdaev, S. K. Tuli, Viktor Riabov, Motoi Inaba, M. G. Hur, C. Y. Chi, Charles Maguire, S. Leckey, C. R. Cleven, W. E. Sondheim, V. Papavassiliou, K. Boyle, P. A. Rukoyatkin, S. Belikov, K. S. Joo, W. A. Zajc, Josh Moss, J. E. Frantz, H. W. Van Hecke, V. Baublis, A. Denisov, V. Cianciolo, Jen-Chieh Peng, E. Kistenev, P. J. Kroon, Sergey Fokin, C. P. Singh, T. Horaguchi, B. M. Johnson, H. Harada, S. Esumi, A. Kiss, D. Sharma, A. Glenn, A. Taketani, Xiong Wang, Z. Conesa del Valle, K. S. Sim, Steven E. Skutnik, Henner Buesching, Dong Jo Kim, Martin Purschke, F. Gastineau, V. L. Rykov, T. Dahms, A. Isupov, C. Suire, H. Qu, D. Kotchetkov, Hideki Hamagaki, K. Aoki, G. David, Junji Tojo, Z. Fraenkel, Alexander Milov, N. Grau, J. Sziklai, K. Shoji, I. Ravinovich, O. Drapier, P. W. Stankus, E. R. Kinney, Brian Cole, D. P. Morrison, S. Campbell, V. E. Semenov, J. Zimányi, Tatsuya Chujo, Y. Nagata, H. Hiejima, S. S. Ryu, Saskia Mioduszewski, K. Imai, R. Bennett, Ahmed Al-Jamel, J. Jin, E. M. Takagui, O. Zaudtke, Jan Rak, R. Lacey, R. Granier de Cassagnac, Y. Cobigo, Anne Marie Sickles, G. R. Young, M. Naglis, C. L. Silva, V. S. Pantuev, Susumu Sato, S. Butsyk, Vladimir Samsonov, Tamas Ferenc Csorgo, K. Okada, J. L. Nagle, B. Sahlmueller, H. En'yo, P. Constantin, M. J. Leitch, F. Staley, A. Deshpande, Y. Watanabe, I. Younus, A. Soldatov, K. Tanida, V. I. Kochetkov, Gerd Joachim Kunde, I. Shein, X. He, O. O. Omiwade, V. Peresedov, H. Masui, A. K. Dubey, S. Takagi, K. N. Barish, Taku Gunji, F. Kajihara, H. Delagrange, A. Baldisseri, Y. S. Kim, T. E. Miller, A. Enokizono, M. Holmes, M. Chiu, T. A. Shibata, M. L. Brooks, D. Isenhower, Marie Germain, A. G. Litvinenko, A. Kozlov, R. Seto, K. Haruna, and V. Dzhordzhadze

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, High mass, High Energy Physics::Experiment, Neutron, Coulomb excitation, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, 01 natural sciences
Abstract

We present the first measurement of photoproduction of J/psi and of two-photon production of high-mass e(+)e(-) pairs in electromagnetic (or ultra-peripheral) nucleus-nucleus interactions, using Au + Au data at root s(NN) = 200 GeV. The events are tagged with forward neutrons emitted following Coulomb excitation of one or both Au* nuclei. The event sample consists of 28 events with m(e+e-) > 2 GeV/c(2) with zero like-sign background. The measured cross sections at midrapidity of d sigma/dy (J/psi + Xn, y = 0) = 76 +/- 33 (stat) +/- 11 (syst) pb and d(2)sigma /dm dy (e(+) e(-) + Xn, y = 0) = 86 +/- 23(stat) +/- 16(syst) mu b/ (GeV/c(2)) for m(e+e-) epsilon vertical bar 2.0, 2.8 vertical bar GeV/c(2) have been compared and found to be consistent with models for photoproduction of J/psi and QED based calculations of two-photon production of e(+)e(-) pairs. (C) 2009 Elsevier B.V. All rights reserved.

Published
2009
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15. Dilepton mass spectra in p+p collisions at s=200 GeV and the contribution from open charm

Author

K. S. Joo, K. N. Barish, Hiroaki Ohnishi, T. Ichihara, J. Chiba, Matthew G. Reuter, M. L. Brooks, Takahiro Fusayasu, Tadaaki Isobe, A. Deshpande, A. P.T. Palounek, Alexander Malakhov, L. Tomášek, Takao Sakaguchi, D. Sharma, D. Silvermyr, P. L. McGaughey, Xingguo Li, C. Klein-Boesing, L. S. Zolin, W. J. Park, X. He, O. O. Omiwade, M. Chiu, V. S. Pantuev, P. D. Barnes, A. Yanovich, V. Peresedov, Tae-Yeon Lee, A. V. Kazantsev, Martin Purschke, A. D. Frawley, T. Tabaru, P. Mikeš, Herve Borel, D. Lynch, T. C. Awes, Kyoichiro Ozawa, T. Liška, Jun Kikuchi, Christophe Pierre Suire, Alexander Milov, J. Gosset, S. P. Sorensen, Dylan Walker, S. Batsouli, H. Masui, A. K. Dubey, D. Kotchetkov, J. G. Lajoie, S. H. Aronson, W. Holzmann, Saskia Mioduszewski, Junji Tojo, S. N. White, I. Younus, T. Hachiya, Y. L. Yamaguchi, B. Komkov, A. A. Bickley, B. Love, I. J. Choi, Minghui Liu, A. Kravitz, Youngil Kwon, C. Silvestre, A. Morreale, R. A. Soltz, Alexei Khanzadeev, Kenneth Francis Read, Z. Fraenkel, M. Gonin, K. Okada, V. L. Rykov, T. Dahms, A. G. Litvinenko, Norio Saito, A. Soldatov, M. A. L. Leite, J. Velkoška, D. Kawall, Marisilvia Donadelli, V. Bumazhnov, H. Pereira, Andry Malala Rakotozafindrabe, B. Sahlmueller, B. Azmoun, A. Král, M. J. Kweon, M. Rosati, K. Das, H. En'yo, K. Tanida, M. J. Leitch, Hiroyuki Okada, M. Grosse Perdekamp, E. P. Hartouni, Maya Hachiya Shimomura, Y. I. Makdisi, J. Jin, O. Zaudtke, M. Ouchida, M. Issah, H. A. Gustafsson, M. Mitrovski, E. Stenlund, A. A. Vinogradov, V. I. Kochetkov, H. Sakata, A. Kozlov, I. Nakagawa, J. Asai, C. Zhang, M. Virius, E. M. Takagui, Eva Haslum, R. S. Towell, O. Drapier, Frank Ellinghaus, B. Lenzi, M. D. Malik, M. Oka, E. Vznuzdaev, I. Garishvili, Akio Kiyomichi, J. Murata, E. R. Kinney, R. Seto, K. Haruna, S. Yokkaichi, M. J. Tannenbaum, D. P. Morrison, S. Campbell, A. Dion, Jiangyong Jia, Y. Goto, Jan Rak, V. Babintsev, V. E. Semenov, T. A. Shibata, N. N. Ajitanand, M. Wysocki, Viktor Riabov, Shingo Sakai, Atsushi Taketani, A. Enokizono, J. Zimányi, Tatsuya Chujo, N. Kurihara, A. Glenn, R. Lacey, R. Granier de Cassagnac, Gerd Joachim Kunde, I. Shein, D. Mukhopadhyay, S. Rembeczki, G. S. Kyle, A. Hadj Henni, Rushan Han, A. Adare, S. Afanasiev, A. Ster, James Alexander, I. Tserruya, S. Butsyk, Yu. Efremenko, V. Singh, C. Y. Chi, Vladimir Samsonov, K. Boyle, Robert F. Hobbs, Wei Xie, D. Winter, M. P. Comets, J. G. Boissevain, Masashi Kaneta, D. Yu Peressounko, M. K. Lee, C. L. Woody, Takahiro Nakamura, R. Averbeck, Byung-Sik Hong, P. Tarján, Debashish Pal, D. Hornback, M. Heffner, A. Bazilevsky, S. Sawada, C. P. Singh, Alberto Baldisseri, B. M. Johnson, K. Dehmelt, Jen-Chieh Peng, Susumu Oda, J. Ying, A. Franz, A. Durum, A. Taranenko, Kazushi Miki, Philippe Rosnet, C. Pinkenburg, Tamas Ferenc Csorgo, J. L. Nagle, Alexandre Lebedev, D. Isenhower, A. Toia, Dong Jo Kim, Osamu Jinnouchi, O. Dietzsch, E. T. Atomssa, H. Valle, D. M. Lee, A. Isupov, J. Sziklai, Senta Greene, S. F. Pate, M. Stepanov, G. Roche, L. Mašek, Y. J. Mao, T. V. Moukhanova, S. Kametani, I. V. Sourikova, Brian Cole, Anne Marie Sickles, D. E. Fields, B. V. Jacak, B. E. Norman, H. Al-Bataineh, M. Naglis, E. O'Brien, X. R. Wang, J. H. Kang, M. McCumber, E. H. Kim, J. S. Haggerty, S. Esumi, A. Romana, C. L. Silva, I. Ravinovich, W. A. Zajc, V. Baublis, A. Denisov, V. Cianciolo, Masayasu Ishihara, V. Papavassiliou, Sébastien Gadrat, Y. Nagata, Susumu Sato, Sergey Fokin, G. R. Young, T. L. Thomas, L. Aphecetche, T. Horaguchi, Ryugo S. Hayano, Y. Riabov, Y. S. Lai, Kenta Shigaki, K. S. Sim, M. Nguyen, V. Dzhordzhadze, Y. Watanabe, A. S. Nyanin, R. Bennett, J. L. Charvet, H. Hiejima, M. Finger, Y. Fukao, A. Shevel, T. Hester, T. E. Miller, Johannes Peter Wessels, V-N. Tram, F. Matathias, Kensuke Homma, Motoi Inaba, Mate Csanad, P. Chung, P. Constantin, S. Chernichenko, David D'Enterria, M. N. Wagner, W. S. Emam, B. Bassalleck, M. Konno, J. T. Mitchell, R. Seidl, Vladislav Manko, H. Kanou, Taku Gunji, H. Gong, M. Slunečka, J. Seele, F. Kajihara, S. Belikov, H. Delagrange, S. Zhou, C. Vale, B. S. Chang, Christine Angela Aidala, J. Klay, Y. Nakamiya, G. Baksay, K. O. Eyser, A. K. Purwar, K. Fujiwara, K. Imai, C. A. Ogilvie, T. K. Hemmick, Yasuo Miake, H. W. Van Hecke, L. Kochenda, J. Egdemir, Jason Kamin, S. P. Stoll, S. S.E. Rosendahl, G. Bunce, A. Churyn, S. Bathe, D. Jouan, R. Pak, Agneta Oskarsson, N. Kamihara, R. Armendariz, Kazuyoshi Kurita, A. Drees, J. Kubart, Y. Berdnikov, Y. Akiba, M. Mishra, S. Nagamiya, Vaclav Vrba, Klaus Johannes Reygers, A. Kiss, Z. Yasin, Henner Buesching, Steven E. Skutnik, Marcus Hohlmann, H. Qu, Hideki Hamagaki, K. Aoki, G. David, N. Grau, K. Shoji, P. W. Stankus, C. R. Cleven, C. Haegemann, Y. Inoue, R. Vértesi, Dong-Hun Kim, Jason Newby, J. E. Frantz, E. J. Desmond, Charles Maguire, M. Togawa, J. Park, Y. Tsuchimoto, I. E. Yushmanov, E. Kistenev, H. Harada, M. B. Deaton, Y. Tanaka, F. Staley, L. Baksay, H. Pei, K. Nakano, W. E. Sondheim, P. A. Rukoyatkin, John Hill, H. A. Torii, Toru Sugitate, L. D. Isenhower, François Fleuret, and S. Takagi

Subjects
Quantum chromodynamics, Physics, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, 01 natural sciences, Nuclear physics, Yield (chemistry), 0103 physical sciences, Mass spectrum, High Energy Physics::Experiment, Charm (quantum number), Nuclear Experiment, 010306 general physics, Lepton
Abstract

PHENIX has measured the electron-positron pair mass spectrum from 0 to 8 GeV/c(2) in p + p collisions at root s = 200 GeV. The contributions from light meson decays to e(+)e(-) pairs have been determined based on measurements of hadron production cross sections by PHENIX. Within the systematic uncertainty of similar to 20% they account for all e(+)e(-) pairs in the mass region below similar to 1 GeV/c(2). The e(+)e(-) pair yield remaining after subtracting these contributions is dominated by semileptonic decays of charmed hadrons correlated through flavor conservation. Using the spectral shape predicted by PYTHIA, we estimate the charm production cross section to be 544 +/- 39(stat) +/- 142(syst) +/- 200(model) pb. which is consistent with QCD calculations and measurements of single leptons by PHENIX. (C) 2008 Elsevier BV. All rights reserved.

Published
2009
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16. Correlated production of p and p¯ in Au+Au collisions at sNN=200 GeV

Author

J. Chiba, M. B. Deaton, R. A. Soltz, H. Borel, M. Grosse Perdekamp, Y. Tanaka, T. K. Shea, G. C. Mishra, Takao Sakaguchi, S. Bathe, Agneta Oskarsson, B. Love, Marie Germain, J. L. Charvet, C. R. Cleven, C. Haegemann, Y. Inoue, C. Klein-Boesing, A. D. Frawley, Y. Berdnikov, Y. Akiba, S. Afanasiev, A. Ster, I. Tserruya, A. G. Litvinenko, P. J. Kroon, T. Tabaru, M. Mishra, S. Nagamiya, Kazuhiro Tanaka, J. Newby, G. Roche, T. E. Miller, E. T. Atomssa, S. Esumi, Yu. Efremenko, V. Singh, Dong-Hun Kim, S. H. Aronson, L. Baksay, Vaclav Vrba, Klaus Johannes Reygers, Charles Maguire, P. Chung, Robert F. Hobbs, T. Hester, W. A. Zajc, V. Baublis, M. Issah, Debashish Pal, S. Sawada, A. Kozlov, W. Holzmann, J. Ying, A. Franz, S. Leckey, Josh Moss, E. Kistenev, D. Hornback, M. Heffner, A. Denisov, S. Belikov, K. S. Joo, V. Cianciolo, R. Seto, K. Haruna, M. Mitrovski, Y. L. Yamaguchi, Tadaaki Isobe, Maya Hachiya Shimomura, Y. I. Makdisi, A. Taranenko, Kazushi Miki, M. Wysocki, Sergey Fokin, M. Holmes, M. D. Malik, E. Vznuzdaev, D. Winter, M. P. Comets, D. Yu Peressounko, V. Dzhordzhadze, Hirohiko Sato, Alexei Khanzadeev, H. Harada, H. Pei, J. S. Chai, T. Horaguchi, N. Grau, K. Shoji, A. Kiss, E. Stenlund, J. L. Drachenberg, S. F. Pate, W. S. Emam, P. L. McGaughey, P. Tarján, J. M. Burward-Hoy, B. Komkov, Norio Saito, M. A. L. Leite, S. Batsouli, X. He, Y. Nakamiya, S. K. Tuli, O. O. Omiwade, K. Dehmelt, P. W. Stankus, M. J. Tannenbaum, Marisilvia Donadelli, V. Bumazhnov, Z. Yasin, Henner Buesching, H. Sakata, L. Aphecetche, H. Al-Bataineh, V. Papavassiliou, J. Egdemir, M. Chiu, T. A. Shibata, S. P. Sorensen, V. Peresedov, Y. Le Bornec, K. Hasuko, Steven E. Skutnik, Jason Kamin, M. C. McCain, G. Baksay, V-N. Tram, S. Kelly, N. N. Ajitanand, Dylan Walker, W. C. Smith, Marcus Hohlmann, Andry Malala Rakotozafindrabe, Senta Greene, D. Isenhower, D. Mukhopadhyay, S. Rembeczki, D. Sharma, Jen-Chieh Peng, K. Das, B. Forestier, Jan Rak, Hiroyuki Okada, V. Babintsev, A. P.T. Palounek, S. P. Stoll, A. Toia, L. Mašek, M. T. Bjorndal, Johannes Peter Wessels, B. E. Norman, Minghui Liu, D. Bucher, E. P. Hartouni, H. Masui, A. K. Dubey, Joakim Nystrand, G. S. Kyle, Tae-Yeon Lee, Eva Haslum, B. Lenzi, Martin Purschke, F. Gastineau, H. Qu, R. Granier de Cassagnac, M. K. Lee, Takahiro Nakamura, A. Adare, P. Rosnet, Kenneth Francis Read, Xiong Wang, A. A. Bickley, K. O. Eyser, S. S.E. Rosendahl, G. Bunce, K. Fujiwara, H. A. Gustafsson, Susumu Oda, D. Kotchetkov, T. Shohjoh, H. Kanou, Taku Gunji, H. Gong, L. Tomášek, A. Hadj Henni, A. V. Kazantsev, S. Takagi, Hideki Hamagaki, K. Aoki, G. David, T. V. Moukhanova, C. Zhang, J. Seele, James Alexander, R. Averbeck, Byung-Sik Hong, A. Durum, V. S. Pantuev, A. Bazilevsky, K. N. Barish, F. Kajihara, F. Matathias, Dong Jo Kim, A. Morreale, Osamu Jinnouchi, A. Churyn, Z. Fraenkel, P. Mikeš, Kensuke Homma, E. O'Brien, Catherine Micaela Silvestre, D. S. Brown, Motoi Inaba, J. G. Lajoie, T. Hachiya, H. Delagrange, K. Boyle, D. Jouan, Wei Xie, Yoichiro Fukao, M. Harvey, Roy A. Lacey, R. Vértesi, B. Azmoun, A. Král, M. J. Kweon, S. Chernichenko, H. Lim, Alexandre Lebedev, Viktor Riabov, T. C. Awes, D. M. Lee, B. Bassalleck, Anne Marie Sickles, Junji Tojo, D. E. Fields, S. Zhou, Kyoichiro Ozawa, T. Liška, Mate Csanad, Rushan Han, M. N. Hagiwara, Jun Kikuchi, M. Konno, B. V. Jacak, H. W. Van Hecke, C. A. Ogilvie, M. L. Brooks, I. J. Choi, A. Baldisseri, J. T. Mitchell, A. Kravitz, M. McCumber, A. K. Purwar, K. Okada, M. Oka, Hiroaki Ohnishi, Y. S. Kim, A. Dion, R. Seidl, S. Butsyk, Vladislav Manko, Christophe Pierre Suire, Alexander Milov, T. K. Hemmick, I. Nakagawa, M. Slunečka, Yasuo Miake, Vladimir Samsonov, Atsushi Taketani, A. Enokizono, I. Otterlund, B. Sahlmueller, E. H. Kim, H. En'yo, P. Constantin, M. J. Leitch, O. Drapier, Frank Ellinghaus, G. R. Young, E. R. Kinney, D. P. Morrison, L. Kochenda, N. Willis, C. Vale, T. Kawagishi, S. Campbell, B. S. Chang, Christine Angela Aidala, J. Klay, V. E. Semenov, J. Zimányi, R. Pak, Tamas Ferenc Csorgo, K. S. Sim, J. L. Nagle, Tatsuya Chujo, N. Kamihara, Y. Kwon, R. Armendariz, Xingguo Li, M. Gonin, H. Hiejima, Kazuyoshi Kurita, E. J. Desmond, T. L. Thomas, David D'Enterria, K. Imai, A. Drees, Xiao-yan Li, J. Kubart, H. Pereira, M. Togawa, J. Park, Florian Bauer, Ryugo S. Hayano, R. P. Pisani, Y. Riabov, Y. Tsuchimoto, Kenta Shigaki, M. Nguyen, I. E. Yushmanov, Nikolay Tyurin, A. S. Nyanin, M. N. Wagner, J. E. Frantz, M. Ouchida, J. Asai, Shingo Sakai, C. L. Woody, A. Shevel, D. Lynch, I. V. Sourikova, A. Glenn, V. L. Rykov, T. Dahms, I. Ravinovich, Y. Nagata, A. Deshpande, Y. Watanabe, S. S. Ryu, T. Ichihara, I. Younus, Matthew G. Reuter, A. Soldatov, D. Kawall, K. Tanida, V. I. Kochetkov, Takahiro Fusayasu, J. Murata, R. Bennett, Gerd Joachim Kunde, I. Shein, C. P. Singh, B. M. Johnson, I. D. Ojha, Alexander Malakhov, A. Isupov, Ahmed Al-Jamel, M. Finger, J. Sziklai, D. Silvermyr, Brian Cole, M. Naglis, L. S. Zolin, C. L. Silva, Saskia Mioduszewski, W. J. Park, Masayasu Ishihara, O. Zaudtke, Susumu Sato, F. Staley, M. Virius, P. D. Barnes, A. Yanovich, J. Jin, E. M. Takagui, R. S. Towell, S. Y. Fung, I. Garishvili, Akio Kiyomichi, N. Kurihara, Y. Cobigo, M. G. Hur, C. Y. Chi, John Hill, H. A. Torii, Toru Sugitate, L. D. Isenhower, François Fleuret, S. N. White, K. Nakano, W. E. Sondheim, O. Dietzsch, H. Valle, Y. J. Mao, S. Kametani, P. A. Rukoyatkin, J. H. Kang, Julia Velkovska, J. S. Haggerty, A. Romana, M. Rosati, S. Gadrat, Bruno Espagnon, A. A. Vinogradov, Henrik Tydesjö, Jiangyong Jia, Y. S. Lai, Y. Goto, J. Gosset, J. P. Sullivan, S. Yokkaichi, J. M. Heuser, J. G. Boissevain, Masashi Kaneta, C. Pinkenburg, and M. Stepanov

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Meson, 010308 nuclear & particles physics, Nuclear Theory, High Energy Physics::Phenomenology, Parton, 01 natural sciences, Nuclear physics, Baryon, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, 010306 general physics, Sign (mathematics), Bar (unit)
Abstract

Correlations between p and (p) over bar at transverse momenta typical of enhanced baryon production in Au + Au collisions are reported. The PHENIX experiment has measured same and opposite sign baryon pairs in Au + Au collisions at root s(NN) = 200 GeV. Correlated production of p and p with the trigger particle from the range 2.5 < p(T) < 4.0 GeV/c and the associated particle with 1.8 < p(T) < 2.5 GeV/c is observed to be nearly independent of the centrality of the collisions. Same sign pairs show no correlation at any centrality. The conditional yield of mesons triggered by baryons (and anti-baryons) and mesons in the same p(T) range rises with increasing centrality, except for the most central collisions, where baryons show a significantly smaller number of associated mesons. These data are consistent with a picture in which hard scattered partons produce correlated p and (p) over bar in the p(T) region of the baryon excess. (c) 2007 Elsevier B.V. All rights reserved.

Published
2007
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17. Measurements of Elliptic and Triangular Flow in High-MultiplicityHe3+AuCollisions atsNN=200 GeV

Author

H. Themann, Y. Nagata, B. Azmoun, A. Král, M. J. Kweon, Dmitry Blau, V. I. Kochetkov, M. Bai, E. C. Aschenauer, E. J. Desmond, R. S. Towell, J. Murata, I. Garishvili, Akio Kiyomichi, F. Wei, M. Togawa, E. Vazquez-Zambrano, M. Tomášek, J. D. Osborn, Gerd Joachim Kunde, Maya Hachiya Shimomura, Inseok Yoon, Zhiying You, J. Park, R. S. Hollis, R. Bennett, P. Tarján, M. Kawashima, G. S. Kyle, A. Rakotozafindrabe, F. Matathias, Kensuke Homma, N. Kurihara, I. Shein, M. Oka, M. Finger, A. Sen, V. S. Pantuev, P. Kline, K. S. Lee, M. Ouchida, James Alexander, A. V. Kazantsev, E. Richardson, P. Constantin, M. Kasai, N. Means, Sung Keun Park, T. Sumita, C. Y. Chi, Charles Maguire, Y. I. Makdisi, J. Hamblen, J. Asai, T. Sodre, K. Sedgwick, Y. Tsuchimoto, Y. Iwanaga, N. N. Ajitanand, K. S. Sim, R. Averbeck, Byung-Sik Hong, A. Bazilevsky, C. Harper, Mihael Makek, Jongmin Lee, S. Dairaku, S. Hasegawa, I. E. Yushmanov, O. Zaudtke, V. Dzhordzhadze, S. Chernichenko, B. Bassalleck, M. Virius, E. T. Atomssa, P. Liebing, J. D. Orjuela Koop, C. H. Chen, T. Tabaru, A. Manion, K. Okada, N. S. Bandara, S. Butsyk, G. D. N. Perera, S. P. Sorensen, A. Deshpande, Takahiro Nakamura, Shingo Sakai, A. Hadj Henni, D. McGlinchey, Eun-Hee Kim, Susumu Oda, H. En'yo, M. J. Leitch, Junji Tojo, Y. Kwon, M. Konno, L. Tomášek, P. Mikeš, Dylan Walker, M. S. Daugherity, C. P. Singh, M. Beaumier, Philippe Rosnet, Alexandre Lebedev, Kiyoshi Tanida, B. M. Johnson, A. Yu. Semenov, J. Gosset, M. Sarsour, Mate Csanad, A. Iordanova, O. Chvala, A. Durum, J. Bryslawskyj, R. J. Petti, A. Taketani, V. L. Rykov, T. Dahms, Z. Yasin, Henner Buesching, Steve Edwards, K. S. Joo, D. M. Lee, Vladimir Samsonov, Christine Nattrass, T. Todoroki, A. Isupov, C. Suire, Seong H. Kim, S. Y. Han, Senta Greene, Y. Watanabe, J. Sziklai, Catherine Micaela Silvestre, K. Yamaura, A. Meles, C. L. Woody, A. Berdnikov, L. Patel, Beomkyu Kim, Wei Xie, M. Stepanov, L. Guo, Alexei Khanzadeev, J. G. Lajoie, E. Stenlund, R. Yang, H. Hiejima, S. Taneja, Gary Grim, M. Alfred, T. Hachiya, A. Caringi, Y. Nakamiya, D. Lynch, Brian Cole, K. Kiriluk, E. Kistenev, M. K. Lee, X. Gong, I. Younus, M. Kurosawa, T. C. Awes, Kyoichiro Ozawa, T. Liška, C. Baumann, J. B. Choi, H. Sakata, M. Nihashi, A. T. Basye, K. V. Dharmawardane, Petr Gallus, Jennifer E. Perry, D. Danley, Hongfang Liu, J. S. Kang, Jun Kikuchi, Marcus Hohlmann, S. Tarafdar, A. Vossen, K. Imai, Saskia Mioduszewski, G. Baksay, Hai Yu, M. Snowball, A. Kravitz, Dipak Kumar Mishra, David D'Enterria, Tadaaki Isobe, Tamas Ferenc Csorgo, B. E. Norman, J. L. Nagle, B. Fadem, E. O'Brien, D. John, P. Castera, K. R. Andrews, D. E. Fields, Ajit Kumar Mohanty, A. Soldatov, N. Novitzky, T. A. Shibata, C. L. Silva, B. V. Jacak, R. P. Pisani, M. Savastio, L. A. Linden Levy, I. V. Sourikova, H. Iinuma, P. Lichtenwalner, M. J. Tannenbaum, T. Sato, S. Esumi, I. J. Choi, T. L. Thomas, X. Jiang, Hiroaki Ohnishi, K. B. Lee, R. A. Soltz, H. Borel, A. P.T. Palounek, J. H. Bhom, M. McCumber, R. Ichimiya, Tae-Yeon Lee, M. Naglis, H. Nakagomi, T. Hoshino, J. Jin, K. O. Eyser, A. K. Purwar, Eva Haslum, B. Lenzi, Martin Purschke, B. Sahlmueller, Y. J. Kim, K. Fujiwara, Y. Onuki, Ryugo S. Hayano, Y. Riabov, J. Hanks, P. L. McGaughey, B. Xia, S. Afanasiev, Jan Rak, D. Isenhower, A. Toia, O. Dietzsch, H. Valle, T. Moon, Y. L. Yamaguchi, Dipanwita Dutta, C. Gal, L. Aphecetche, M. N. Wagner, Y. Fukao, A. Shevel, Pawan Kumar Netrakanti, D. Broxmeyer, T. Hester, Masayasu Ishihara, J. H. Do, M. Chiu, S. Beckman, C. L. Towell, J. T. Mitchell, H. Torii, B. K. Schmoll, A. Ster, N. Feege, Y. Miyachi, D. Roach, K. M. Kijima, R. Lacey, R. Granier de Cassagnac, A. Morreale, Kenta Shigaki, L. Mašek, M. Nguyen, A. S. Nyanin, A. Adare, B. Kimelman, M. Grosse Perdekamp, S. Mizuno, S. Yokkaichi, Julia Velkovska, M. Rosati, N. Hotvedt, R. Seidl, H. A. Gustafsson, C. Zhang, T. V. Moukhanova, Y. Ikeda, Z. Fraenkel, V. Khachatryan, Hiroyuki Sako, F. Giordano, M. E. Connors, Atsushi Takahara, S. K. Park, K. Hashimoto, Vladislav Manko, F. Staley, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Rachid Nouicer, H. W. Van Hecke, A. Dion, L. Zou, M. Slunečka, A. N. Zelenski, M. Proissl, P. Ružička, J. G. Boissevain, V-N. Tram, A. Kim, Jaehyeok Yoo, D. Mukhopadhyay, R. K. Choudhury, N. Grau, Shunji Nishimura, T. Rinn, Masashi Kaneta, A. A. Vinogradov, Xingguo Li, S. W. Nam, R. Vértesi, D. Hornback, E. Tennant, S. Rembeczki, Motoi Inaba, K. A. Drees, S. Belikov, Min Soo Kim, J. L. Charvet, S. Bathe, R. Akimoto, Minghui Liu, M. Gonin, D. Sharma, R. M. Wright, Johannes Peter Wessels, R. Tanabe, D. Layton, B. Komkov, Viktor Riabov, Agneta Oskarsson, M. Heffner, Jiangyong Jia, Y. Goto, H. Harada, C. Pinkenburg, Serpil Yalcin, A. Taranenko, T. Jones, Peter Christiansen, Kazushi Miki, Kenneth Francis Read, Y. Berdnikov, K. Dehmelt, S. H. Lee, Y. Akiba, K. Karatsu, J. Ben-Benjamin, T. E. Miller, T. Horaguchi, Brajesh K. Singh, J. Sun, D. Winter, D. Yu Peressounko, C. Vale, C. McKinney, W. C. Chang, A. Sukhanov, K. Kurita, M. Mishra, S. Nagamiya, G. Roche, B. S. Chang, Y. J. Mao, S. Kametani, Y. Hori, Anne Marie Sickles, Aaron Angerami, H. Pereira, Dennis Perepelitsa, J. Klatsky, A. Timilsina, Christine Angela Aidala, Tsutomu Mibe, M. I. Nagy, Vaclav Vrba, Klaus Johannes Reygers, J. Klay, M. A. L. Leite, Kei Nagashima, Rui Wei, B. Schaefer, A. Enokizono, H. Pei, Y. Morino, J. H. Kang, J. S. Haggerty, S. R. Lee, A. Romana, G. W. Kim, J. S. Bok, P. Chung, K. Utsunomiya, D. Watanabe, H. H. Shim, D. Kleinjan, S. Campbell, Rushan Han, S. H. Lim, J. Imrek, D. Kotchetkov, Raphael Noel Tieulent, W. A. Zajc, Jason Newby, Eric Appelt, C. O. Kim, M. D. Malik, L. Xue, J. Chiba, E. Vznuzdaev, Alice Mignerey, Susumu Sato, W. S. Emam, A. Datta, K. Das, J. E. Frantz, H. Asano, R. Pak, H. Kanou, R. Belmont, J. S. Kapustinsky, Jong-Min Park, M. B. Deaton, E. P. Hartouni, G. R. Young, V. Baublis, A. Denisov, Yuki Watanabe, V. Babintsev, Su Houng Lee, Y. S. Lai, V. Cianciolo, Taku Gunji, H. Gong, J. Seele, M. Patel, Y. Tanaka, L. D'Orazio, S. Miyasaka, Y. Tomita, E. Mannel, F. Kajihara, Nagahiro Saito, T. Novák, H. Delagrange, Sergey Fokin, H. J. Moon, L. Baksay, S. Zhou, A. Baldisseri, S. D. Rolnick, Takao Sakaguchi, C. Klein-Boesing, A. D. Frawley, A. S. White, S. Huang, S. H. Aronson, W. Holzmann, H. F. Hamilton, P. Sett, M. Mitrovski, Takafumi Niida, J. Huang, J. S. Yoo, M. K. Dayananda, Prakhar Garg, B. Bannier, T. Murakami, Robert F. Hobbs, Yi Gu, E. M. Takagui, Debashish Pal, S. Sawada, J. Ying, A. Franz, C. M. Camacho, Prashant Shukla, S. F. Pate, Ke. Nakamura, H. Al-Bataineh, J. A. Key, Alexander Milov, I. Nakagawa, Young-Ki Kim, T. Engelmore, S. Motschwiller, O. Drapier, Frank Ellinghaus, D. Ivanishchev, E. R. Kinney, D. P. Morrison, V. Papavassiliou, Sébastien Gadrat, B. H. Kang, V. E. Semenov, H. Al-Ta'Ani, Tatsuya Chujo, Jen-Chieh Peng, J. G. Rubin, D. Reynolds, Inkyu Park, Xiong Wang, Z. Conesa del Valle, Dong Jo Kim, S. Takagi, M. Wysocki, I. Tserruya, M. Jezghani, Yu. Efremenko, V. Singh, T. Koblesky, K. N. Barish, A. Glenn, Eunja Kim, S. Sano, N. Kamihara, X. He, J. Zimamyi, O. O. Omiwade, R. Armendariz, Byoungchoo Park, Y. Aramaki, N. Apadula, V. Peresedov, Z. Rowan, M. Mendoza, M. L. Brooks, C. Oakley, A. Drees, Steven E. Skutnik, S. N. White, Deepa Thomas, J. Kubart, J. Koster, K. Sakashita, T. O. S. Haseler, H. Qu, P. B. Diss, Zvi Hirsh Citron, D. Kotov, S. Batsouli, H. Masui, A. K. Dubey, H. Ge, K. Nakano, Hideki Hamagaki, K. Aoki, G. David, K. I. Hahn, J. Egdemir, A. A. Bickley, D. S. Jumper, Jason Kamin, A. Veicht, A. Mwai, W. E. Sondheim, B. Love, P. Montuenga, S. P. Stoll, C. R. Cleven, C. Haegemann, Y. Inoue, K. Boyle, P. A. Rukoyatkin, T. Ichihara, T. Kempel, Dong-Hun Kim, S. Kaneti, Osamu Jinnouchi, S. S.E. Rosendahl, A. G. Litvinenko, G. Bunce, Matthew G. Reuter, Takahiro Fusayasu, K. Watanabe, Alexander Malakhov, K. Shoji, A. Churyn, R. Kitamura, D. Silvermyr, S. Kanda, P. W. Stankus, L. S. Zolin, D. Jouan, A. Sexton, W. J. Park, Christopher Rosen, A. Kozlov, P. D. Barnes, A. Yanovich, R. Seto, K. Haruna, B. Meredith, C. A. Ogilvie, T. K. Hemmick, B. J. Ramson, John Hill, J. M. Durham, Yasuo Miake, Toru Sugitate, L. D. Isenhower, I. Danchev, K. DeBlasio, L. Kochenda, M. Issah, R. Pinson, François Fleuret, I. Ravinovich, and D. Kawall

Subjects
Nuclear physics, Physics, Pseudorapidity, Elliptic flow, Hadron, General Physics and Astronomy, Rapidity, Multiplicity (mathematics), Nuclear Experiment, Nucleon, Glauber, Charged particle
Abstract

We present the first measurement of elliptic ($v_2$) and triangular ($v_3$) flow in high-multiplicity $^{3}$He$+$Au collisions at $\sqrt{s_{_{NN}}}=200$ GeV. Two-particle correlations, where the particles have a large separation in pseudorapidity, are compared in $^{3}$He$+$Au and in $p$$+$$p$ collisions and indicate that collective effects dominate the second and third Fourier components for the correlations observed in the $^{3}$He$+$Au system. The collective behavior is quantified in terms of elliptic $v_2$ and triangular $v_3$ anisotropy coefficients measured with respect to their corresponding event planes. The $v_2$ values are comparable to those previously measured in $d$$+$Au collisions at the same nucleon-nucleon center-of-mass energy. Comparison with various theoretical predictions are made, including to models where the hot spots created by the impact of the three $^{3}$He nucleons on the Au nucleus expand hydrodynamically to generate the triangular flow. The agreement of these models with data may indicate the formation of low-viscosity quark-gluon plasma even in these small collision systems.

Published
2015
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18. Measurement of Vector Meson Decays in Nuclei at J-PARC

Author

Junpei Kanaya, S. Sawada, Yuhei Morino, Shinichi Masumoto, Y. Obara, Akio Kiyomichi, Wataru Nakai, Takuya Shibukawa, K. Ozawa, K. Aoki, Hideki Hamagaki, Yoki Aramaki, D. Kawama, M. Sekimoto, Tomonori Takahashi, Ryotaro Muto, Y. Komatsu, Megumi Naruki, S. Yokkaichi, H. Murakami, Fuminori Sakuma, Koki Kanno, Kenta Shigaki, H. En'yo, and Y. Watanabe

Subjects
Physics, Nuclear physics, Particle physics, Spectrometer, High energy accelerator, Gas electron multiplier, Synchrotron radiation, Center (algebra and category theory), Vector meson, J-PARC
Abstract

1 RIKEN Nishina Center, RIKEN, Saitama 351-0198, Japan 2KEK, High Energy Accelerator Research Organization, Ibaraki 305-0801, Japan 3Center for Nuclear Study, Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan 4Department of Physics, University of Tokyo, Tokyo 113-0033, Japan 5Japan Synchrotron Radiation Research Institute, Hyogo 679-5198, Japan 6Department of Physics, Kyoto University, Kyoto 113-0033, Japan 7Hiroshima University, Hiroshima 739-8526, Japan 8Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan

Published
2015
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19. Systematic study of azimuthal anisotropy in Cu + Cu and Au + Au collisions atsNN=62.4and 200 GeV

Author

F. Matathias, Kensuke Homma, S. Chernichenko, H. Lim, B. Bassalleck, M. Konno, Tadaaki Isobe, J. S. Chai, P. L. McGaughey, Y. Nakamiya, D. Lynch, G. Baksay, B. Forestier, M. T. Bjorndal, B. Sahlmueller, J. T. Mitchell, R. Seidl, Vladislav Manko, M. Slunečka, C. Vale, B. S. Chang, J. Klay, P. Rosnet, O. Dietzsch, S. Afanasiev, A. Ster, K. O. Eyser, K. Fujiwara, H. Valle, J. Newby, G. Roche, Julia Velkovska, J. Chiba, T. Ichihara, D. Hornback, V. S. Pantuev, A. Taranenko, H. W. Van Hecke, G. C. Mishra, Takao Sakaguchi, Kazushi Miki, M. Harvey, J. L. Drachenberg, C. Klein-Boesing, Osamu Jinnouchi, Takahiro Fusayasu, I. D. Ojha, J. G. Boissevain, Masashi Kaneta, Alexander Malakhov, H. Pei, A. D. Frawley, D. Silvermyr, Y. Fukao, A. Shevel, K. Hasuko, D. Kawall, L. S. Zolin, W. J. Park, K. Okada, S. P. Sorensen, M. Gonin, C. Pinkenburg, S. Huang, S. H. Aronson, V. I. Kochetkov, M. Rosati, Tamás Csörgő, Dylan Walker, T. Hester, H. En'yo, P. D. Barnes, A. Yanovich, B. Love, Joakim Nystrand, P. Constantin, M. J. Leitch, Eva Haslum, B. Lenzi, M. Stepanov, W. Holzmann, Marie Germain, J. Murata, Bruno Espagnon, A. A. Vinogradov, Henrik Tydesjö, Maya Hachiya Shimomura, A. G. Litvinenko, J. Gosset, S. N. White, Jiangyong Jia, Y. Goto, J. P. Sullivan, Y. I. Makdisi, Gerd Joachim Kunde, I. Shein, G. S. Kyle, J. M. Burward-Hoy, Alexei Khanzadeev, A. Kozlov, R. Seto, V-N. Tram, K. Nakano, E. Stenlund, K. Haruna, James Alexander, H. Sakata, Charles Maguire, W. C. Smith, S. Leckey, W. E. Sondheim, C. L. Woody, M. J. Tannenbaum, Motoi Inaba, R. Averbeck, Byung-Sik Hong, S. Yokkaichi, J. M. Heuser, V. Dzhordzhadze, Robert F. Hobbs, X. He, Alberto Baldisseri, A. Deshpande, C. P. Singh, A. Bazilevsky, K. Das, K. Boyle, P. A. Rukoyatkin, Mate Csanad, M. K. Lee, I. Tserruya, Y. J. Mao, O. O. Omiwade, S. Y. Fung, Josh Moss, D. Mukhopadhyay, Yu. Efremenko, S. Kametani, V. Peresedov, Robert Vertesi, Y. Le Bornec, B. M. Johnson, E. P. Hartouni, S. Rembeczki, J. G. Lajoie, V. Singh, Alexandre Lebedev, Kiyoshi Tanida, J. H. Kang, D. Bucher, D. M. Lee, Steven E. Skutnik, J. S. Haggerty, A. Romana, T. Hachiya, A. Kiss, A. Isupov, Y. Watanabe, E. Kistenev, John Hill, Anne Marie Sickles, David D'Enterria, I. V. Sourikova, S. Butsyk, H. A. Torii, Toru Sugitate, T. L. Thomas, L. D. Isenhower, Y. L. Yamaguchi, S. Gadrat, H. Masui, A. K. Dubey, J. Sziklai, A. A. Bickley, Minghui Liu, T. V. Moukhanova, Vladimir Samsonov, B. Komkov, I. Younus, Ryugo S. Hayano, S. Takagi, I. Otterlund, S. Bathe, Norio Saito, T. Todoroki, H. Harada, Z. Yasin, Hirohiko Sato, S. K. Tuli, Henner Buesching, M. A. L. Leite, Y. Riabov, Brian Cole, M. Heffner, K. N. Barish, R. P. Pisani, Kenneth Francis Read, Kenta Shigaki, A. Soldatov, Debashish Pal, M. Nguyen, G. R. Young, H. Qu, François Fleuret, R. S. Towell, M. B. Deaton, A. S. Nyanin, Christophe Pierre Suire, Alexander Milov, I. Garishvili, Akio Kiyomichi, S. Sawada, Y. S. Lai, S. Batsouli, Rachid Nouicer, Nikolay Tyurin, I. J. Choi, A. Kravitz, I. Nakagawa, A. V. Kazantsev, M. Naglis, Hideki Hamagaki, K. Aoki, G. David, N. Kurihara, Frank Ellinghaus, Y. Tanaka, V. Babintsev, C. L. Silva, B. Azmoun, J. Ying, E. R. Kinney, K. S. Sim, D. P. Morrison, T. K. Shea, S. Campbell, A. Král, M. J. Kweon, L. Tomášek, A. Franz, M. N. Wagner, Marcus Hohlmann, J. L. Nagle, M. L. Brooks, V. E. Semenov, Junji Tojo, Y. Kwon, P. Mikeš, M. Reuter, H. Iinuma, M. C. McCain, J. Zimányi, Masayasu Ishihara, Tatsuya Chujo, Torsten Dahms, K. Dehmelt, M. G. Hur, C. Y. Chi, H. Hiejima, Jen-Chieh Peng, Susumu Sato, F. Staley, L. Baksay, E. J. Desmond, N. Grau, A. P.T. Palounek, M. Oka, Xiao-yan Li, K. Shoji, K. Imai, Marisilvia Donadelli, V. Bumazhnov, T. C. Awes, Kyoichiro Ozawa, T. Liška, A. Dion, M. Togawa, Jun Kikuchi, Saskia Mioduszewski, Jan Rak, P. W. Stankus, J. Park, R. Lacey, K. Kurita, A. Enokizono, H. Pereira, Florian Bauer, W. A. Zajc, S. Kelly, R. Granier de Cassagnac, A. Adare, V. Baublis, S. Belikov, K. S. Joo, N. Kamihara, A. Rakotozafindrabe, N. N. Ajitanand, A. Denisov, V. Cianciolo, J. Jin, E. M. Takagui, Sergey Fokin, Y. Tsuchimoto, J. E. Frantz, Laurent Bernard Aphecetche, Herve Borel, A. Glenn, A. Taketani, V. L. Rykov, O. Zaudtke, M. Virius, Takahiro Nakamura, R. Armendariz, T. Horaguchi, C. R. Cleven, C. Haegemann, Y. Inoue, Rushan Han, M. N. Hagiwara, S. Esumi, D. Sharma, Y. Cobigo, I. Ravinovich, Susumu Oda, I. E. Yushmanov, Tae-Yeon Lee, Martin Purschke, C. A. Aidala, F. Gastineau, Y. Nagata, P. J. Kroon, T. Shohjoh, A. Durum, A. Drees, Dong-Hun Kim, H. A. Gustafsson, S. S. Ryu, Eun-Hee Kim, Catherine Micaela Silvestre, Agneta Oskarsson, D. Kotchetkov, D. S. Brown, C. Zhang, R. Bennett, A. Morreale, Ahmed Al-Jamel, J. Kubart, M. Finger, Z. Fraenkel, Y. Berdnikov, Viktor Riabov, M. Ouchida, Y. Akiba, R. Pak, S. F. Pate, M. Mishra, S. Nagamiya, J. Asai, Kazuhiro Tanaka, O. Drapier, J. Egdemir, H. Al-Bataineh, D. E. Fields, B. V. Jacak, M. McCumber, A. K. Purwar, Jason Kamin, Vaclav Vrba, Klaus Johannes Reygers, S. P. Stoll, V. Papavassiliou, Shingo Sakai, M. Mitrovski, M. Wysocki, S. S.E. Rosendahl, G. Bunce, A. Churyn, D. Jouan, Johannes Peter Wessels, C. A. Ogilvie, T. K. Hemmick, Yasuo Miake, L. Kochenda, M. Issah, T. Kawagishi, Hiroaki Ohnishi, M. D. Malik, E. Vznuzdaev, N. Willis, A. Hadj Henni, Wei Xie, Xingguo Li, R. A. Soltz, M. Grosse Perdekamp, D. Winter, M. P. Comets, D. Yu Peressounko, P. Tarján, T. Tabaru, Senta Greene, B. E. Norman, E. O'Brien, Xiong Wang, Dong Jo Kim, M. Chiu, T. A. Shibata, D. Isenhower, A. Toia, L. Mašek, J. L. Charvet, T. E. Miller, E. T. Atomssa, P. Chung, M. Holmes, W. S. Emam, H. Kanou, Taku Gunji, H. Gong, J. Seele, F. Kajihara, H. Delagrange, S. Zhou, and Y. S. Kim

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Angular momentum, Quantitative Biology::Neurons and Cognition, Hadron, Kinetic energy, Particle identification, Nuclear physics, High Energy Physics::Experiment, Impact parameter, Nuclear Experiment, Anisotropy, Energy (signal processing)
Abstract

We have studied the dependence of azimuthal anisotropy $v_2$ for inclusive and identified charged hadrons in Au$+$Au and Cu$+$Cu collisions on collision energy, species, and centrality. The values of $v_2$ as a function of transverse momentum $p_T$ and centrality in Au$+$Au collisions at $\sqrt{s_{_{NN}}}$=200~GeV and 62.4~GeV are the same within uncertainties. However, in Cu$+$Cu collisions we observe a decrease in $v_2$ values as the collision energy is reduced from 200 to 62.4~GeV. The decrease is larger in the more peripheral collisions. By examining both Au$+$Au and Cu$+$Cu collisions we find that $v_2$ depends both on eccentricity and the number of participants, $N_{\rm part}$. We observe that $v_2$ divided by eccentricity ($\varepsilon$) monotonically increases with $N_{\rm part}$ and scales as ${N_{\rm part}^{1/3}}$. The Cu$+$Cu data at 62.4 GeV falls below the other scaled $v_{2}$ data. For identified hadrons, $v_2$ divided by the number of constituent quarks $n_q$ is independent of hadron species as a function of transverse kinetic energy $KE_T=m_T-m$ between $0.1

Published
2015
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20. Measurement ofKS0andK*0inp+p,d+Au, and Cu + Cu collisions atsNN=200 GeV

Author

P. Sett, Jen-Chieh Peng, J. G. Rubin, Martin Purschke, C. A. Aidala, C. Baumann, Y. Ikeda, D. Reynolds, S. Dairaku, M. Mitrovski, Takafumi Niida, Inkyu Park, J. G. Boissevain, M. S. Daugherity, C. P. Singh, Xiong Wang, C. Silvestre, Serpil Yalcin, D. Kotchetkov, Pawan Kumar Netrakanti, Z. Conesa del Valle, M. K. Dayananda, Masashi Kaneta, B. M. Johnson, O. Zaudtke, Dong Jo Kim, A. Morreale, Prakhar Garg, Z. Fraenkel, B. Bannier, V. Khachatryan, R. Akimoto, M. Virius, E. T. Atomssa, R. J. Petti, A. Isupov, C. Suire, Aaron Angerami, R. A. Soltz, R. K. Choudhury, C. Pinkenburg, Marisilvia Donadelli, S. Campbell, J. D. Orjuela Koop, G. S. Kyle, A. Veicht, K. Dehmelt, C. H. Chen, J. Sziklai, G. Roche, James Alexander, C. L. Woody, A. Berdnikov, V. Bumazhnov, M. P. Comets, D. Black, Y. J. Mao, S. Kametani, W. A. Zajc, L. Xue, V. Baublis, A. Denisov, Yuki Watanabe, M. Wysocki, M. Vargyas, A. Manion, Brian Cole, J. H. Kang, T. L. Thomas, Sung Keun Park, M. Grosse Perdekamp, F. Giordano, M. E. Connors, V. Cianciolo, B. Meredith, B. Azmoun, Ryugo S. Hayano, Y. Riabov, J. S. Haggerty, A. Caringi, A. Romana, A. Král, Kenta Shigaki, M. J. Kweon, I. Ravinovich, R. Averbeck, Byung-Sik Hong, M. Nguyen, A. S. Nyanin, Rachid Nouicer, Min Soo Kim, A. N. Zelenski, R. Tanabe, M. Proissl, V. S. Pantuev, Sergey Fokin, Petr Gallus, Y. Nagata, M. Gonin, N. N. Ajitanand, A. Bazilevsky, Atsushi Takahara, A. J. Miller, T. Horaguchi, Philippe Rosnet, Y. S. Lai, M. Rosati, R. S. Towell, Prashant Shukla, S. F. Pate, T. Ichihara, Osamu Jinnouchi, Matthew G. Reuter, Takahiro Fusayasu, M. Oka, P. Kline, K. S. Lee, Alexander Milov, I. Nakagawa, Young-Ki Kim, T. Engelmore, N. Novitzky, G. D. N. Perera, Takahiro Nakamura, A. Sukhanov, K. Kurita, H. Pereira, Y. Morino, Gary Grim, K. V. Dharmawardane, K. A. Drees, J. L. Charvet, Alexandre Lebedev, D. M. Lee, Maya Hachiya Shimomura, R. S. Hollis, Y. I. Makdisi, P. Liebing, I. V. Sourikova, O. Drapier, Frank Ellinghaus, E. R. Kinney, D. McGlinchey, Susumu Oda, C. O. Kim, M. Bai, I. Garishvili, Akio Kiyomichi, F. Wei, J. Gosset, H. Iinuma, A. P.T. Palounek, A. A. Vinogradov, Ke. Nakamura, M. Beaumier, K. S. Joo, D. P. Morrison, H. Al-Bataineh, J. A. Key, S. P. Sorensen, S. K. Park, Dylan Walker, A. Durum, J. Klatsky, O. Chvala, X. He, O. O. Omiwade, J. Hamblen, T. E. Miller, Alexander Malakhov, K. Kihara, V. E. Semenov, J. Zimányi, Tatsuya Chujo, Y. Onuki, K. Yamaura, S. Yokkaichi, J. G. Lajoie, H. A. Gustafsson, A. Hadj Henni, M. Alfred, T. Hachiya, M. Ouchida, N. Means, J. Asai, S. Whitaker, Shingo Sakai, Inseok Yoon, Zhiying You, R. Bennett, M. Kawashima, N. Kurihara, J. Bryslawskyj, Jennifer E. Perry, Jiangyong Jia, Y. Goto, D. Kleinjan, D. Ivanishchev, T. Jones, I. Tserruya, Peter Christiansen, D. Winter, S. Afanasiev, A. Ster, N. Feege, Y. Aramaki, V. Peresedov, Jan Rak, R. Lacey, C. Zhang, M. Jezghani, Yu. Efremenko, S. Esumi, P. Ružička, R. Granier de Cassagnac, D. Silvermyr, J. Koster, R. Ichimiya, A. Kravitz, A. Adare, A. Enokizono, M. Finger, Hiroaki Ohnishi, Jongmin Lee, D. Yu Peressounko, Viktor Riabov, V. Papavassiliou, Sébastien Gadrat, J. Newby, Beomkyu Kim, Wei Xie, T. Sumita, A. V. Kazantsev, C. Y. Chi, T. Murakami, K. Okada, K. Das, Hongfang Liu, D. E. Fields, S. Batsouli, H. Masui, A. K. Dubey, V. Singh, Y. Fukao, A. Shevel, Rushan Han, B. Komkov, E. P. Hartouni, Herve Borel, D. Lynch, M. J. Tannenbaum, O. Dietzsch, L. S. Zolin, Robert F. Hobbs, W. J. Park, P. Tarján, H. En'yo, M. J. Leitch, B. V. Jacak, P. Chung, A. A. Bickley, A. Mwai, B. Love, L. Ding, Y. Nakamiya, A. Taketani, H. Valle, M. Kofarago, I. J. Choi, B. Xia, Dipanwita Dutta, Christopher Rosen, M. Kurosawa, T. Koblesky, D. Hornback, N. S. Bandara, S. Butsyk, K. S. Sim, V. Dzhordzhadze, Saskia Mioduszewski, P. D. Barnes, A. Yanovich, M. Naglis, Dennis Perepelitsa, D. Roach, K. M. Kijima, M. McCumber, T. Tabaru, C. Gal, V. L. Rykov, T. Dahms, A. G. Litvinenko, Junji Tojo, Y. Kwon, Vladimir Samsonov, Julia Velkovska, T. Hester, H. Torii, B. K. Schmoll, Debashish Pal, S. Sawada, M. Towell, J. Ying, A. Franz, Tsutomu Mibe, H. Nakagomi, T. Hoshino, Y. Gu, M. A. L. Leite, R. Yang, H. Hiejima, A. Taranenko, Senta Greene, Christine Nattrass, T. Todoroki, N. Riveli, A. Sexton, Xingguo Li, S. Taneja, L. Tomášek, A. T. Basye, B. E. Norman, Susumu Sato, W. S. Emam, A. Datta, Kazushi Miki, S. J. Jeon, B. Fadem, E. O'Brien, P. Mikeš, H. Asano, K. B. Lee, J. Hanks, Tamas Ferenc Csorgo, A. Kozlov, R. Seto, K. Haruna, K. Imai, D. Sharma, M. I. Nagy, D. Watanabe, A. Kim, D. Mukhopadhyay, Brajesh K. Singh, S. Rembeczki, J. Jin, K. Karatsu, E. M. Takagui, S. H. Lim, J. L. Nagle, I. Danchev, S. Takagi, K. N. Barish, A. Glenn, Anne Marie Sickles, B. Schaefer, E. Joo, M. D. Malik, E. Vznuzdaev, Eunja Kim, Masayasu Ishihara, M. Stepanov, L. Patel, John Hill, M. K. Lee, J. S. Bok, T. C. Awes, Ajit Kumar Mohanty, Hari Guragain, G. Baksay, S. Sano, R. Belmont, J. S. Kapustinsky, L. Aphecetche, H. Ozaki, T. A. Shibata, C. L. Silva, J. S. Kang, Toru Sugitate, G. R. Young, S. Tarafdar, J. H. Do, M. L. Brooks, T. Sato, Kyoichiro Ozawa, T. Liška, A. Dion, Jun Kikuchi, L. D. Isenhower, V. Babintsev, Tadaaki Isobe, Johannes Peter Wessels, Eva Haslum, B. Lenzi, J. Chiba, Alice Mignerey, L. D'Orazio, S. Miyasaka, François Fleuret, X. Jiang, P. L. McGaughey, Z. Rowan, M. Mendoza, S. N. White, M. Chiu, Deepa Thomas, A. Meles, V-N. Tram, S. Beckman, Hiroyuki Sako, N. Grau, S. W. Nam, D. Kawall, Takao Sakaguchi, A. Sen, M. Leitgab, D. Isenhower, Minghui Liu, C. Klein-Boesing, A. D. Frawley, M. Heffner, Kenneth Francis Read, H. Themann, Motoi Inaba, V. I. Kochetkov, R. M. Wright, A. Toia, T. Moon, M. Sarsour, Mate Csanad, A. Iordanova, S. Y. Han, L. Mašek, S. Huang, J. Murata, S. H. Aronson, Gerd Joachim Kunde, M. Nihashi, I. Shein, W. Holzmann, David D'Enterria, H. Kanou, Taku Gunji, H. Gong, J. Seele, K. Sedgwick, R. P. Pisani, M. Patel, F. Kajihara, Alberto Baldisseri, Mihael Makek, A. Deshpande, B. Sahlmueller, H. Delagrange, M. N. Wagner, S. Zhou, Y. J. Kim, Y. Watanabe, J. T. Mitchell, S. D. Rolnick, I. Younus, R. Seidl, Vladislav Manko, A. Soldatov, M. Slunečka, S. Hasegawa, A. Kiss, S. Belikov, Z. Yasin, Henner Buesching, Steve Edwards, Marcus Hohlmann, C. Vale, L. A. Linden Levy, B. S. Chang, A. Timilsina, J. Klay, K. O. Eyser, A. K. Purwar, K. Fujiwara, Y. L. Yamaguchi, F. Matathias, Kensuke Homma, E. Richardson, S. Mizuno, P. Constantin, S. Chernichenko, B. Bassalleck, M. Konno, H. W. Van Hecke, S. Bathe, Agneta Oskarsson, Y. Berdnikov, S. Wolin, R. Pak, S. H. Lee, Y. Akiba, C. McKinney, M. Mishra, S. Nagamiya, Vaclav Vrba, Klaus Johannes Reygers, N. Kamihara, Rui Wei, R. Armendariz, N. Apadula, C. Oakley, A. Drees, Y. Imazu, J. Kubart, Steven E. Skutnik, H. Qu, Hideki Hamagaki, K. Aoki, G. David, K. I. Hahn, K. Watanabe, C. A. Ogilvie, K. Shoji, M. Tomášek, T. K. Hemmick, P. W. Stankus, J. M. Durham, Yasuo Miake, P. Montuenga, C. R. Cleven, K. DeBlasio, L. Kochenda, M. Issah, C. Haegemann, Y. Inoue, T. Kempel, R. Pinson, K. Sakashita, D. Kotov, J. Egdemir, D. S. Jumper, Charles Maguire, Jason Kamin, S. P. Stoll, Kiyoshi Tanida, E. Kistenev, P. Lichtenwalner, H. Harada, J. Sun, H. Pei, S. S.E. Rosendahl, G. Bunce, H. J. Kim, A. Churyn, M. B. Deaton, D. Jouan, Y. Tanaka, E. Mannel, Nagahiro Saito, H. J. Moon, F. Staley, L. Baksay, R. Vértesi, J. E. Frantz, Dmitry Blau, E. J. Desmond, M. Togawa, E. Vazquez-Zambrano, J. Park, A. Rakotozafindrabe, M. Kasai, Y. Tsuchimoto, Y. Iwanaga, I. E. Yushmanov, Eun-Hee Kim, Alexei Khanzadeev, E. Stenlund, J. B. Choi, H. Sakata, Dipak Kumar Mishra, D. H. Kim, J. H. Bhom, T. V. Moukhanova, Zvi Hirsh Citron, H. Ge, K. Nakano, W. E. Sondheim, D. Ivanischev, K. Boyle, P. A. Rukoyatkin, and Tae-Yeon Lee

Subjects
Physics, Quark, Nuclear and High Energy Physics, Meson, Nuclear Theory, Strangeness, Phi meson, Baryon, Nuclear physics, Deuterium, High Energy Physics::Experiment, Impact parameter, Nuclear Experiment, Relativistic Heavy Ion Collider
Abstract

The PHENIX experiment at the Relativistic Heavy Ion Collider has performed a systematic study of K-S(0) and K*(0) meson production at midrapidity in p + p, d + Au, and Cu + Cu collisions at root s(NN) = 200 GeV. The K-S(0) and K*(0) mesons are reconstructed via their K-S(0) -> pi(0)(-> gamma gamma) pi(0)(-> gamma gamma) and K*(0) -> K-+/-pi(-/+) decay modes, respectively. The measured transverse-momentum spectra are used to determine the nuclear modification factor of K-S(0) and K*(0) mesons in d + Au and Cu + Cu collisions at different centralities. In the d + Au collisions, the nuclear modification factor of K-S(0) and K*(0) mesons is almost constant as a function of transverse momentum and is consistent with unity, showing that cold-nuclear-matter effects do not play a significant role in the measured kinematic range. In Cu + Cu collisions, within the uncertainties no nuclear modification is registered in peripheral collisions. In central collisions, both mesons show suppression relative to the expectations from the p + p yield scaled by the number of binary nucleon-nucleon collisions in the Cu + Cu system. In the p(T) range 2-5 GeV/c, the strange mesons (K-S(0), K*(0)) similarly to the phi meson with hidden strangeness, showan intermediate suppression between the more suppressed light quark mesons (pi(0)) and the nonsuppressed baryons (p, (p) over bar). At higher transverse momentum, p(T) > 5 GeV/c, production of all particles is similarly suppressed by a factor of approximate to 2.

Published
2014
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21. System-size dependence of open-heavy-flavor production in nucleus-nucleus collisions atsNN=200GeV

Author

L. Aphecetche, V. S. Pantuev, Mate Csanad, Alexei Khanzadeev, Johannes Peter Wessels, P. Tarján, Y. L. Yamaguchi, E. Stenlund, Eva Haslum, B. Lenzi, B. Komkov, R. Pak, John Hill, H. A. Torii, Toru Sugitate, L. D. Isenhower, N. Kamihara, Saskia Mioduszewski, R. Armendariz, N. Apadula, H. Sakata, A. Drees, J. Kubart, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, K. Okada, S. F. Pate, Y. J. Mao, S. Kametani, David D'Enterria, M. A. L. Leite, D. McGlinchey, T. Tabaru, S. Afanasiev, A. Ster, H. Al-Bataineh, Maya Hachiya Shimomura, A. V. Kazantsev, N. N. Ajitanand, M. Issah, H. En'yo, M. J. Leitch, François Fleuret, T. Ichihara, T. V. Moukhanova, M. Rosati, M. D. Malik, E. Vznuzdaev, D. Kawall, R. Vértesi, Osamu Jinnouchi, Matthew G. Reuter, Takahiro Fusayasu, Y. I. Makdisi, Alexander Milov, I. Nakagawa, Senta Greene, K. S. Joo, M. N. Wagner, J. Jin, Takahiro Nakamura, K. S. Sim, J. H. Kang, Alexander Malakhov, J. S. Haggerty, V. Papavassiliou, Jason Newby, V. Dzhordzhadze, Sébastien Gadrat, F. Matathias, J. E. Frantz, Robert F. Hobbs, E. M. Takagui, O. Drapier, Frank Ellinghaus, B. E. Norman, E. O'Brien, S. P. Sorensen, A. A. Vinogradov, D. Hornback, D. Silvermyr, Y. Fukao, A. Shevel, V. Babintsev, L. S. Zolin, E. R. Kinney, W. J. Park, L. Tomášek, V. I. Kochetkov, Rushan Han, A. Romana, S. Butsyk, B. Love, Kensuke Homma, P. Mikeš, Dylan Walker, A. Hadj Henni, P. D. Barnes, D. P. Morrison, Junji Tojo, A. Yanovich, S. Campbell, Y. Kwon, Susumu Oda, Vladimir Samsonov, T. Hester, J. Murata, Jiangyong Jia, Y. Goto, Debashish Pal, R. A. Soltz, H. Borel, S. Sawada, C. P. Singh, A. Taranenko, H. Iinuma, B. M. Johnson, E. J. Desmond, A. Durum, Wei Xie, J. Ying, V. E. Semenov, A. Franz, M. B. Deaton, Gerd Joachim Kunde, J. Zimányi, M. Togawa, P. Constantin, Kazushi Miki, S. Chernichenko, J. Park, A. P.T. Palounek, A. Rakotozafindrabe, S. N. White, I. Shein, H. Hiejima, S. Esumi, A. Isupov, C. Suire, Tatsuya Chujo, K. Dehmelt, M. J. Tannenbaum, D. Sharma, Y. Tsuchimoto, Catherine Micaela Silvestre, B. Bassalleck, Jen-Chieh Peng, J. Sziklai, M. Grosse Perdekamp, K. Nakano, Tamas Ferenc Csorgo, A. G. Litvinenko, I. E. Yushmanov, Eun-Hee Kim, Tae-Yeon Lee, J. G. Lajoie, Martin Purschke, T. C. Awes, Kyoichiro Ozawa, T. Liška, M. Konno, W. E. Sondheim, Brian Cole, J. L. Nagle, K. Das, C. A. Aidala, T. Hachiya, M. K. Lee, H. A. Gustafsson, K. Imai, D. Mukhopadhyay, M. Mitrovski, R. S. Towell, V-N. Tram, K. Boyle, P. A. Rukoyatkin, Y. Tanaka, Y. S. Lai, Jun Kikuchi, I. Garishvili, Akio Kiyomichi, Xiong Wang, Z. Yasin, E. P. Hartouni, Henner Buesching, Y. Nakamiya, D. Kotchetkov, Dong Jo Kim, I. J. Choi, A. Kravitz, N. Kurihara, S. Baumgart, C. Zhang, J. Gosset, M. Naglis, M. Wysocki, S. Rembeczki, G. Baksay, Jan Rak, C. L. Silva, O. Dietzsch, Minghui Liu, Motoi Inaba, R. Lacey, A. Kozlov, A. Morreale, D. E. Fields, B. V. Jacak, C. Y. Chi, G. S. Kyle, I. Tserruya, R. Granier de Cassagnac, A. Adare, E. T. Atomssa, M. Heffner, Kenneth Francis Read, Yu. Efremenko, H. Valle, M. Gonin, Viktor Riabov, Nagahiro Saito, Z. Fraenkel, V. Singh, Masayasu Ishihara, J. Chiba, M. McCumber, R. Seto, K. Haruna, Tadaaki Isobe, James Alexander, F. Staley, B. Sahlmueller, A. Deshpande, L. Baksay, B. Azmoun, A. Král, M. J. Kweon, Marcus Hohlmann, S. Yokkaichi, W. A. Zajc, H. Pei, V. Baublis, P. L. McGaughey, J. T. Mitchell, Takao Sakaguchi, D. Winter, R. Averbeck, A. Denisov, V. Cianciolo, Byung-Sik Hong, Julia Velkovska, D. Yu Peressounko, Anne Marie Sickles, K. Kurita, A. Bazilevsky, H. Pereira, M. Chiu, Sergey Fokin, X. He, O. O. Omiwade, J. G. Boissevain, M. Oka, R. Seidl, Philippe Rosnet, Vladislav Manko, A. Dion, Masashi Kaneta, C. Klein-Boesing, Alexandre Lebedev, A. D. Frawley, Y. Watanabe, V. Peresedov, T. Horaguchi, M. Slunečka, D. M. Lee, S. Bathe, C. Pinkenburg, A. Enokizono, I. Younus, S. H. Aronson, G. R. Young, C. A. Ogilvie, T. K. Hemmick, Yasuo Miake, M. Stepanov, G. Roche, L. Kochenda, Hiroaki Ohnishi, Agneta Oskarsson, John Matthew Durham, A. Soldatov, J. Egdemir, S. Batsouli, H. Masui, A. K. Dubey, S. Belikov, W. Holzmann, Jason Kamin, Charles Maguire, S. P. Stoll, Y. Berdnikov, Y. Akiba, A. A. Bickley, S. S.E. Rosendahl, G. Bunce, M. Mishra, A. Churyn, D. Jouan, S. Nagamiya, T. L. Thomas, C. Vale, B. S. Chang, S. Takagi, K. N. Barish, Vaclav Vrba, Klaus Johannes Reygers, J. Klay, Kiyoshi Tanida, E. Kistenev, Xingguo Li, K. O. Eyser, A. K. Purwar, K. Fujiwara, Ryugo S. Hayano, H. Harada, Y. Riabov, Kenta Shigaki, M. Nguyen, M. L. Brooks, H. W. Van Hecke, A. S. Nyanin, Rachid Nouicer, M. Ouchida, J. Asai, D. Lynch, Shingo Sakai, C. R. Cleven, C. Haegemann, Y. Inoue, A. Taketani, C. L. Woody, Dong-Hun Kim, V. L. Rykov, T. Dahms, N. Grau, K. Shoji, O. Zaudtke, P. W. Stankus, M. Virius, I. V. Sourikova, Steven E. Skutnik, A. Glenn, I. Ravinovich, Y. Nagata, H. Qu, R. Bennett, M. Finger, Hideki Hamagaki, K. Aoki, G. David, T. A. Shibata, D. Isenhower, A. Toia, L. Mašek, H. Kanou, Taku Gunji, H. Gong, J. Seele, F. Kajihara, H. Delagrange, S. Zhou, A. Baldisseri, J. L. Charvet, T. E. Miller, P. Chung, Susumu Sato, and W. S. Emam

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Quantitative Biology::Neurons and Cognition, 010308 nuclear & particles physics, Hadron, chemistry.chemical_element, Electron, 01 natural sciences, 7. Clean energy, Copper, Nuclear physics, medicine.anatomical_structure, chemistry, 0103 physical sciences, medicine, High Energy Physics::Experiment, Charm (quantum number), Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Relativistic Heavy Ion Collider, Nucleus
Abstract

The PHENIX Collaboration at the Relativistic Heavy Ion Collider has measured open-heavy-flavor production in Cu + Cu collisions at v root s(NN) = 200 GeV through the measurement of electrons at midrapidity that originate from semileptonic decays of charm and bottom hadrons. In peripheral Cu + Cu collisions an enhanced production of electrons is observed relative to p + p collisions scaled by the number of binary collisions. In the transverse momentum range from 1 to 5 GeV/c the nuclear modification factor is R-AA similar to 1.4. As the system size increases to more central Cu + Cu collisions, the enhancement gradually disappears and turns into a suppression. For p(T) > 3 GeV/c, the suppression reaches R-AA similar to 0.8 in the most central collisions. The p(T) and centrality dependence of R-AA in Cu + Cu collisions agree quantitatively with R-AA in d + Au and Au + Au collisions, if compared at a similar number of participating nucleons .

Published
2014
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22. MicroTCA-based image processing system at SPring-8

Author

Souroku Ueda, Akio Kiyomichi, and Takemasa Masuda

Subjects
Engineering, Advanced Mezzanine Card, Robustness (computer science), business.industry, Embedded system, Scalability, Hot swapping, Camera Link, Image processing, Field-programmable gate array, business, Computer hardware, PCI Express
Abstract

We have developed a new image processing system based on MicroTCA that has advantages over PC-based systems in terms of robustness, flexibility, and scalability, due to its hotswappable modular architecture. The system was built with commercial off-the-shelf products to reduce development costs and time. It consists of a Camera Link FMC, a user-configurable Spartan6 FPGA AMC with an FMC slot and processor AMCs (PrAMCs) with the Linux OS. The Camera Link FPGA IP core has been newly developed in compliance with the AXI4 open-bus to enhance reusability. The FPGA AMC is connected with the PrAMC by PCI Express x1. The image data captured by the Camera Link interface is transmitted to the PrAMC using DMA transfer. The Linux device driver and library have been developed to acquire images and control the camera exposure time, gain and so on. The hot swapping procedure of the FPGA AMC is also realized on Linux.

Published
2014
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23. Data acquisition system of over Giga-Bps of data rate for user experiment at X-ray Free-Electron Laser facility SACLA

Author

Toru Ohata, Akio Kiyomichi, Kensuke Okada, Toshinori Abe, T. Hirono, Yukito Furukawa, Yasumasa Joti, Mitsuhiro Yamaga, Takashi Sugimoto, Arnaud Amselem, Ryotaro Tanaka, Takashi Kameshima, and Takaki Hatsui

Subjects
SACLA, Data acquisition, Beamline, Robustness (computer science), Computer science, Data stream mining, Detector, Real-time computing, Free-electron laser, Supercomputer
Abstract

The data acquisition and control system for user experiments at the X-ray Free Electron Laser facility, SACLA, has been in stable operation since March 2012. The system handles up to 5 Gbps throughput of X-ray imaging data that are produced by a mega-pixel two-dimensional detector, in synchronization with the 60 Hz of the beam repetition cycle. In the autumn of 2014, a new beamline, now under construction, will be in commissioning towards the public use. The data acquisition system will be upgraded to handle two data streams from simultaneous experiments on two beamlines. A tag number distribution system and the MADOCA II framework provide more flexibility and robustness for the system. A 90 TFLOPS supercomputer has been set up this spring, to cope with the anticipated increase in the of users' requirement for the analysis of large data sets.

Published
2014
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24. Transverse-energy distributions at midrapidity inp+p,d+Au, andAu+Aucollisions atsNN=62.4–200 GeV and implications for particle-production models

Author

J. M. Burward-Hoy, R. A. Soltz, V. Bumazhnov, M. P. Comets, P. Rosnet, Vladislav Manko, Y. J. Kwon, Saskia Mioduszewski, W. C. Smith, Robert F. Hobbs, L. Sanfratello, W. C. Chang, Ferenc Deák, N. Kamihara, M. K. Lee, Yves Roland Schutz, F. Matathias, R. Armendariz, X. Camard, M. N. Hagiwara, Debashish Pal, S. Sawada, S. Butsyk, C. Vale, Vladimir Samsonov, A. Drees, I. Otterlund, J. Jin, A. Franz, A. Devismes, E. M. Takagui, T. L. Thomas, Taku Gunji, B. D. Fox, F. Kajihara, B. Espagnon, K. Das, E. P. Hartouni, R. S. Towell, H. Delagrange, C. H. Kuberg, Tamas Ferenc Csorgo, Akio Kiyomichi, O. Zaudtke, J. Chiba, H. W. Van Hecke, J. L. Nagle, V. S. Pantuev, N. Kurihara, S. Zhou, M. A. Volkov, M. Harvey, Y. S. Kim, M. Wysocki, B. Khachaturov, T. Matsumoto, M. G. Hur, C. Y. Chi, Y. Cobigo, M. Grosse Perdekamp, Ryugo S. Hayano, K. Hasuko, C. A. Ogilvie, M. Chiu, Ajit Kumar Mohanty, Kensuke Homma, T. A. Shibata, A. Deshpande, J. L. Drachenberg, K. Okada, T. K. Hemmick, N. N. Ajitanand, H. Kobayashi, A. Pierson, S. Bathe, Agneta Oskarsson, I. Ravinovich, G. C. Mishra, Y. Nagata, S. Chernichenko, H. En'yo, P. Constantin, Yasuo Miake, M. J. Leitch, H. Lim, Marie Germain, T. Ichihara, S. C. Johnson, B. Bassalleck, Y. Berdnikov, D. Isenhower, Joakim Nystrand, Takao Sakaguchi, S. S. Ryu, N. Grau, S. F. Pate, Eva Haslum, C. P. Singh, Y. Akiba, C. Klein-Boesing, Osamu Jinnouchi, H. Pei, M. Konno, German Martinez, Y. Riabov, Kenta Shigaki, David Olle Rickard Silvermyr, K. Shoji, S. Nagamiya, Kazuhiro Tanaka, B. M. Johnson, Takahiro Nakamura, A. D. Frawley, L. Kochenda, F. K. Wohn, Matthew G. Reuter, Klaus Johannes Reygers, B. Azmoun, M. J. Kweon, R. Bennett, A. Isupov, C. Suire, X. R. Wang, S. Afanasiev, M. Nguyen, D. Winter, D. Yu Peressounko, A. Ster, P. W. Stankus, Ahmed Al-Jamel, S. H. Aronson, T. Kawagishi, T. E. Miller, A. G. Litvinenko, J. E. Frantz, J. Sziklai, R. Santo, A. Enokizono, A. S. Nyanin, A. Kiss, G. Roche, Y. Le Bornec, S. P. Sorensen, W. Holzmann, Herve Borel, Brian Cole, M. Holmes, P. Tarján, Sean A. Kelly, Henner Buesching, A. Glenn, A. Taketani, R. Kohara, I. D. Ojha, Alexander Malakhov, V. L. Rykov, T. Dahms, Viktor Veszpremi, V. Papavassiliou, Maya Hachiya Shimomura, P. Chand, Y. I. Makdisi, J. Egdemir, T. Shohjoh, Y. Watanabe, A. Durum, C. R. Cleven, A. Dion, B. Forestier, M. T. Bjorndal, J. G. Boissevain, I. Younus, Masashi Kaneta, E. Kim, S. P. Stoll, A. Kozlov, L. S. Zolin, K. S. Sim, T. Tabaru, P. J. Kroon, R. Seto, K. Haruna, A. Taranenko, M. J. Tannenbaum, D. S. Brown, Senta Greene, W. J. Park, S. Belikov, K. S. Joo, V. V. Ikonnikov, Junji Tojo, S. S.E. Rosendahl, B. Sahlmueller, G. Bunce, A. Soldatov, B. E. Norman, E. O'Brien, K. Katou, P. D. Barnes, Steven E. Skutnik, D. Mukhopadhyay, V. Dzhordzhadze, D. Bucher, H. J. Kim, H. Qu, A. Yanovich, C. L. Woody, M. Inuzuka, Hideki Hamagaki, K. Aoki, D. E. Fields, G. David, X. He, O. O. Omiwade, B. V. Jacak, C. Pinkenburg, M. Naglis, S. Y. Fung, H. Hiejima, D. Jouan, A. K. Purwar, V. Peresedov, C. L. Silva, John Hill, K. Oyama, M. Stepanov, S. Esumi, Toru Sugitate, L. D. Isenhower, D. Sharma, Masayasu Ishihara, Susumu Sato, H. Masui, A. K. Dubey, J. Gosset, J. P. Sullivan, S. Takagi, M. Muniruzzaman, Martin Purschke, C. A. Aidala, F. Gastineau, K. N. Barish, I. V. Sourikova, H. Torii, François Fleuret, K. Imai, S. N. White, J. G. Lajoie, V. I. Kochetkov, J. Murata, T. J. Uam, D. Kotchetkov, M. L. Brooks, Gerd Joachim Kunde, W. E. Sondheim, I. Shein, S. Yokkaichi, J. M. Heuser, T. Hachiya, K. Boyle, P. A. Rukoyatkin, Alberto Baldisseri, Z. Fraenkel, Y. J. Mao, S. Kametani, Pàl Hidas, Anne Marie Sickles, Y. Tanaka, J. H. Kang, J. S. Haggerty, T. K. Shea, A. Romana, R. K. Choudhury, A. G. Hansen, Shingo Sakai, S. Gadrat, Nagahiro Saito, F. Staley, Charles Maguire, S. Leckey, G. R. Young, I. J. Choi, Josh Moss, Kiyoshi Tanida, E. Kistenev, Hiroaki Ohnishi, H. Harada, Y. Fukao, Jan Rak, R. Lacey, R. Granier de Cassagnac, V-N. Tram, J. M. Qualls, Motoi Inaba, M. Sarsour, Mate Csanad, David D'Enterria, R. P. Pisani, Xingguo Li, M. Gonin, Nikolay Tyurin, V.N. Penev, M. N. Wagner, K. Kurita, H. Pereira, Minghui Liu, M. Heffner, Kenneth Francis Read, Tadaaki Isobe, J. S. Chai, P. L. McGaughey, A. V. Kazantsev, Alexei Khanzadeev, N. Bruner, E. Stenlund, Jen-Chieh Peng, T. V. Moukhanova, E. J. Desmond, Dong Jo Kim, Jean-Pierre Cussonneau, M. Togawa, T. C. Awes, Kyoichiro Ozawa, J. Park, Florian Bauer, Jun Kikuchi, Y. Tsuchimoto, I. E. Yushmanov, Eun-Hee Kim, R. Vértesi, Ch. Finck, Jason Newby, Alexander Milov, O. Drapier, M. Rosati, M. Velkovsky, E. R. Kinney, D. P. Morrison, A. A. Vinogradov, Henrik Tydesjö, H. A. Gustafsson, S. Campbell, Jiangyong Jia, Y. Goto, V. E. Semenov, J. Zimányi, C. Zhang, Tatsuya Chujo, I. Tserruya, Yu. Efremenko, V. Singh, G. B. Kim, Viktor Riabov, B. Komkov, O. Dietzsch, H. Valle, S. Batsouli, Dipanwita Dutta, Julia Velkovska, M. A. L. Leite, Hirohiko Sato, S. K. Tuli, H. Iinuma, M. C. McCain, A. P.T. Palounek, V. Babintsev, W. A. Zajc, V. Baublis, A. Denisov, V. Cianciolo, Sergey Fokin, T. Horaguchi, A. Hoover, S. S. Adler, G. S. Kyle, N. Willis, James Alexander, M. Issah, M. D. Malik, E. Vznuzdaev, R. Averbeck, Byung-Sik Hong, A. Bazilevsky, Alexandre Lebedev, D. M. Lee, Xiaopeng Zong, L. Aphecetche, Takeo Kawabata, Johannes Peter Wessels, A. Hadj Henni, Wei Xie, and J. T. Mitchell

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Transverse plane, Deuterium, Production model, High Energy Physics::Experiment, Nuclear Experiment, 16. Peace & justice, Nucleon, Glauber, Ansatz
Abstract

Measurements of the midrapidity transverse-energy distribution, dE(T)/d eta, are presented for p + p, d+Au, and Au+Au collisions atv root s(NN) = 200 GeV and additionally for Au+Au collisions atv root s(NN) = 62.4 and 130 GeV. The dE(T)/d eta distributions are first compared with the number of nucleon participants N-part, number of binary collisions N-coll, and number of constituent-quark participants N-qp calculated from a Glauber model based on the nuclear geometry. For Au+Au, /N-part increases with N-part, while /N-qp is approximately constant for all three energies. This indicates that the two-component ansatz, dE(T)/d eta alpha (1 - x)N-part/2 + xN(coll), which was used to represent E-T distributions, is simply a proxy for N-qp, and that the N-coll term does not represent a hard-scattering component in E-T distributions. The dE(T)/d eta distributions of Au+Au and d+Au are then calculated from the measured p + p E-T distribution using two models that both reproduce the Au+Au data. However, while the number-of-constituent-quark-participant model agrees well with the d+Au data, the additive-quark model does not.

Published
2014
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25. Experimental Investigation for Mass Modification of Vector Mesons at J-PARC

Author

Tomonori Takahashi, Yoki Aramaki, S. Yokkaichi, Yosuke Watanabe, Wataru Nakai, D. Kawama, Yuki Obara, Junpei Kanaya, S. Sawada, Hideki Hamagaki, Michiko Sekimoto, Megumi Naruki, Kenta Shigaki, Yuhei Morino, Akio Kiyomichi, Ryotaro Muto, Y. Komatsu, H. En'yo, Shinichi Masumoto, Kyoichiro Ozawa, Kazuya Aoki, Koki Kanno, Fuminori Sakuma, Takuya Shibukawa, and Hikari Murakami

Subjects
Physics, Particle physics, Meson, J-PARC
Published
2014
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26. Medium Modification of Jet Fragmentation inAu+AuCollisions atsNN=200 GeVMeasured in Direct Photon-Hadron Correlations

Author

K. Dehmelt, M. Kurosawa, Jen-Chieh Peng, F. Matathias, L. D'Orazio, Y. J. Mao, S. Kametani, Kensuke Homma, E. Richardson, Saskia Mioduszewski, P. Constantin, S. Miyasaka, Takao Sakaguchi, J. H. Kang, J. S. Haggerty, S. R. Lee, S. Chernichenko, B. Meredith, B. Bassalleck, C. Klein-Boesing, John Hill, Inkyu Park, P. D. Barnes, Jongmin Lee, A. D. Frawley, T. Tabaru, M. Konno, Hongfang Liu, Toru Sugitate, D. E. Fields, S. Huang, C. Silvestre, L. D. Isenhower, B. V. Jacak, B. Lewis, B. Komkov, Xiong Wang, O. Dietzsch, S. H. Aronson, J. Jin, E. M. Takagui, H. Valle, M. McCumber, Dong Jo Kim, W. Holzmann, Y. S. Lai, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, K. Sakashita, Herve Borel, D. Lynch, J. Hanks, Hiroaki Ohnishi, K. B. Lee, François Fleuret, R. A. Soltz, Dipanwita Dutta, Y. Nakamiya, D. Kotov, Norio Saito, Tsutomu Mibe, M. A. L. Leite, Y. Tsuchimoto, C. Gal, Y. Miyachi, Sung Keun Park, Tomoya Tsuji, M. Mendoza, S. N. White, N. N. Ajitanand, A. Taketani, D. S. Jumper, Takahiro Nakamura, Julia Velkovska, R. Tanabe, D. Layton, D. McGlinchey, Y. Ikeda, Maya Hachiya Shimomura, R. S. Hollis, Susumu Oda, A. Durum, J. Egdemir, Zvi Hirsh Citron, Y. I. Makdisi, M. Grosse Perdekamp, S. H. Lim, K. Yamaura, K. O. Eyser, A. K. Purwar, K. Fujiwara, K. Nakano, J. G. Boissevain, R. Belmont, M. Stepanov, G. Baksay, Jason Kamin, M. B. Deaton, A. Sen, Masashi Kaneta, V. L. Rykov, T. Dahms, K. B. Kim, L. Ding, W. E. Sondheim, J. S. Kapustinsky, M. E. Connors, D. Ivanischev, V. Babintsev, S. P. Stoll, V. S. Pantuev, M. Sano, I. Tserruya, Y. L. Yamaguchi, D. Roach, K. M. Kijima, Yu. Efremenko, Tae-Yeon Lee, Martin Purschke, C. A. Aidala, S. Tarafdar, R. Akimoto, C. Pinkenburg, M. Rosati, W. C. Chang, R. Vértesi, K. Boyle, P. A. Rukoyatkin, C. R. Cleven, V. Singh, Y. Tanaka, J. Hamblen, C. Haegemann, Y. Inoue, C. Baumann, B. Sahlmueller, K. Hashimoto, E. Leitner, I. Ravinovich, M. Tomášek, G. S. Kyle, S. S.E. Rosendahl, G. Bunce, Y. J. Kim, M. J. Tannenbaum, H. Torii, Junji Tojo, James Alexander, J. Zimanyi, G. Roche, B. Love, A. Yu. Semenov, Rushan Han, S. Butsyk, Vladimir Samsonov, A. A. Vinogradov, E. Mannel, M. S. Daugherity, C. P. Singh, T. Ichihara, B. M. Johnson, Osamu Jinnouchi, M. Javani, Xingguo Li, Peter Christiansen, D. Winter, D. Yu Peressounko, Matthew G. Reuter, Atsushi Takahara, K. A. Drees, K. Karatsu, Filip Krizek, J. Gosset, Y. Hori, Anne Marie Sickles, Y. Nagata, Takahiro Fusayasu, R. Averbeck, E. C. Aschenauer, A. Churyn, Byung-Sik Hong, A. Bazilevsky, D. Mukhopadhyay, E. Tennant, S. Rembeczki, R. J. Petti, K. Okada, H. W. Van Hecke, J. T. Mitchell, D. Jouan, Philippe Rosnet, M. Bai, T. Kempel, Dong-Hun Kim, Eva Haslum, B. Lenzi, A. Morreale, S. Kaneti, R. Seidl, Vladislav Manko, S. Belikov, S. Baumgart, H. En'yo, M. J. Leitch, Christine Nattrass, T. Todoroki, Jiangyong Jia, C. L. Woody, A. Berdnikov, Y. Goto, A. Isupov, C. Suire, M. Naglis, Alexander Malakhov, Z. Fraenkel, H. J. Moon, F. Staley, L. Baksay, A. Glenn, J. Sziklai, D. Silvermyr, L. S. Zolin, Alexandre Lebedev, A. G. Litvinenko, D. M. Lee, K. Gainey, J. E. Frantz, M. Slunečka, Zhiying You, D. Kotchetkov, R. Bennett, C. A. Ogilvie, Brian Cole, Minghui Liu, Tamas Ferenc Csorgo, S. Afanasiev, A. Ster, W. J. Park, Eunja Kim, K. Watanabe, Christopher Rosen, R. S. Towell, R. K. Choudhury, S. P. Sorensen, D. Kleinjan, A. Yanovich, Dylan Walker, J. P. Wood, P. Tarján, I. Garishvili, Akio Kiyomichi, F. Wei, J. Klatsky, X. Bing, O. Chvala, M. Kawashima, S. Yokkaichi, K. Kiriluk, M. Finger, S. Dairaku, T. K. Hemmick, Seong H. Kim, J. M. Durham, E. H. Kim, Dmitry Blau, B. Azmoun, A. Král, M. J. Kweon, X. Jiang, Yasuo Miake, Masayasu Ishihara, O. Zaudtke, K. Shoji, G. R. Young, C. Vale, B. S. Chang, J. Newby, A. Kozlov, Alexander Milov, M. Heffner, Kyeongpil Lee, R. Seto, I. Nakagawa, R. Luechtenborg, Tomofumi Nagae, J. L. Nagle, P. Castera, Kenneth Francis Read, A. Kiss, M. Soumya, P. W. Stankus, Young-Ki Kim, N. Kurihara, K. Haruna, H. Pei, E. J. Desmond, T. Engelmore, N. Novitzky, J. G. Lajoie, J. Ide, Z. Yasin, T. Hachiya, Henner Buesching, O. Drapier, Frank Ellinghaus, M. Virius, E. T. Atomssa, L. Kochenda, M. Issah, M. Togawa, E. Vazquez-Zambrano, J. Klay, M. K. Lee, J. S. Kang, Steve Edwards, I. Danchev, S. Takagi, M. Oka, E. R. Kinney, Tadaaki Isobe, C. Y. Chi, A. Nederlof, J. Park, D. Hornback, D. P. Morrison, P. Kline, K. S. Lee, K. Das, H. J. Kim, A. Rakotozafindrabe, A. Kravitz, E. P. Hartouni, S. Campbell, M. Gonin, D. Kawall, B. H. Kang, Senta Greene, V. E. Semenov, K. N. Barish, Y. Komatsu, H. Themann, S. Wolin, R. Pak, C. H. Chen, M. Kasai, N. Kamihara, Steven E. Skutnik, K. S. Sim, V. Dzhordzhadze, M. I. Nagy, Y. Kwon, A. Garishvili, X. Gong, Marcus Hohlmann, V. I. Kochetkov, P. L. McGaughey, A. Taranenko, S. Sano, P. Liebing, H. Al-Ta'Ani, A. Sukhanov, K. Kurita, D. Watanabe, L. A. Linden Levy, Tatsuya Chujo, H. Pereira, A. T. Basye, I. V. Sourikova, I. E. Yushmanov, A. Manion, B. E. Norman, R. Armendariz, Y. Morino, M. Chiu, J. Murata, Byoungchoo Park, A. Drees, R. Yang, H. Qu, H. Hiejima, K. S. Joo, S. Taneja, Kazushi Miki, T. Horaguchi, Brajesh K. Singh, S. Bathe, Gerd Joachim Kunde, Charles Maguire, L. Guo, Alexei Khanzadeev, Agneta Oskarsson, Shinichi Masumoto, S. Choi, B. Fadem, E. O'Brien, C. O. Kim, I. Shein, E. Stenlund, J. B. Choi, H. Sakata, J. Kubart, A. V. Kazantsev, M. Vargyas, M. L. Brooks, Hideki Hamagaki, K. Aoki, G. David, K. Imai, K. I. Hahn, Y. Onuki, M. D. Malik, X. He, Y. Berdnikov, S. H. Lee, Y. Akiba, C. McKinney, E. Vznuzdaev, K. Sedgwick, M. Mishra, S. Nagamiya, Dipak Kumar Mishra, Kiyoshi Tanida, O. O. Omiwade, E. Kistenev, L. Tomášek, N. Apadula, P. Mikeš, Alberto Baldisseri, Mihael Makek, Jan Rak, M. Ouchida, N. Means, R. Lacey, Y. Aramaki, V. Peresedov, R. Granier de Cassagnac, A. Adare, Vaclav Vrba, Klaus Johannes Reygers, Rui Wei, J. Asai, H. Harada, J. Sun, J. Koster, L. Patel, A. Deshpande, T. V. Moukhanova, S. Batsouli, Shingo Sakai, T. L. Thomas, A. Vossen, H. Masui, A. K. Dubey, T. C. Awes, Kyoichiro Ozawa, T. Liška, J. S. Bok, A. A. Bickley, Jun Kikuchi, A. Veicht, Y. Watanabe, Ryugo S. Hayano, A. Romana, I. Younus, Y. Riabov, Kenta Shigaki, M. Nguyen, A. S. Nyanin, S. Esumi, D. Sharma, Rachid Nouicer, A. N. Zelenski, M. Proissl, R. Ichimiya, A. Soldatov, C. Zhang, A. Hadj Henni, Beomkyu Kim, H. Å Gustafsson, Wei Xie, P. Ružička, I. J. Choi, L. Aphecetche, A. Dion, Johannes Peter Wessels, Viktor Riabov, K. V. Dharmawardane, H. Iinuma, A. P.T. Palounek, Aaron Angerami, W. A. Zajc, V. Baublis, A. Denisov, Yuki Watanabe, V. Cianciolo, Y. Tomita, Sergey Fokin, Ajit Kumar Mohanty, T. A. Shibata, C. L. Silva, T. Sato, D. Isenhower, A. Toia, L. Mašek, H. Kanou, Taku Gunji, H. Gong, J. Seele, F. Kajihara, H. Delagrange, S. Zhou, C. M. Camacho, S. D. Rolnick, Prashant Shukla, S. F. Pate, J. L. Charvet, Ke. Nakamura, T. E. Miller, H. Al-Bataineh, A. Enokizono, P. Chung, J. Imrek, S. Motschwiller, Susumu Sato, W. S. Emam, V. Papavassiliou, Sébastien Gadrat, A. Datta, H. Asano, M. Mitrovski, Takafumi Niida, Bum-Hoon Lee, M. Wysocki, B. Bannier, T. Murakami, Robert F. Hobbs, Debashish Pal, S. Sawada, J. Ying, A. Franz, R. Reynolds, M. Sarsour, Mate Csanad, A. Iordanova, M. Nihashi, David D'Enterria, R. P. Pisani, M. N. Wagner, Y. Fukao, A. Shevel, T. Hester, N. A. Sparks, V-N. Tram, N. Grau, M. Leitgab, Motoi Inaba, R. M. Wright, J. Chiba, and Alice Mignerey

Subjects
Physics, Energy loss, Photon, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, 7. Clean energy, 01 natural sciences, Nuclear physics, Fragmentation (mass spectrometry), 0103 physical sciences, Fragmentation function, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

The jet fragmentation function is measured with direct photon-hadron correlations in p + p and Au + Au collisions at root S-NN = 200 GeV. The P-T of the photon is an excellent approximation to the initial P-T of the jet and the ratio Z(T) = P-T(h)/P-T(gamma) is used as a proxy for the jet fragmentation function. A statistical subtraction is used to extract the direct photon-hadron yields in Au + Au collisions while a photon isolation cut is applied in p + p. I-AA, the ratio of hadron yield opposite the photon in Au + Au to that in p + p, indicates modification of the jet fragmentation function. Suppression, most likely due to energy loss in the medium, is seen at high Z(T). The associated hadron yield at low Z(T) is enhanced at large angles. Such a trend is expected from redistribution of the lost energy into increased production of low-momentum particles.

Published
2013
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27. Direct photon production ind+Au collisions atsNN=200GeV

Author

A. Devismes, Y. Onuki, Taku Gunji, H. Gong, J. Seele, Alexander Milov, I. Nakagawa, Jan Rak, T. Engelmore, F. Kajihara, S. V. Afanasiev, L. Aphecetche, Takeo Kawabata, H. Pei, M. C. McCain, R. Lacey, Aaron Angerami, Tadaaki Isobe, O. Drapier, S. S. Adler, G. S. Kyle, H. Delagrange, Frank Ellinghaus, N. Willis, R. Granier de Cassagnac, A. Adare, E. R. Kinney, D. P. Morrison, James Alexander, S. Campbell, W. A. Zajc, Hongfang Liu, D. E. Fields, A. Dion, M. Slunečka, R. Averbeck, P. L. McGaughey, Byung-Sik Hong, V. Baublis, S. Zhou, A. Denisov, V. E. Semenov, J. Zimányi, B. V. Jacak, A. Bazilevsky, V. Cianciolo, Johannes Peter Wessels, Hiroaki Ohnishi, K. B. Lee, H. J. Kim, Y. Fukao, S. D. Rolnick, T. Murakami, Y. Tomita, Philippe Rosnet, Sergey Fokin, C. Silvestre, M. McCumber, A. K. Purwar, Robert F. Hobbs, J. M. Qualls, T. Hester, Alexandre Lebedev, R. Vértesi, A. Hoover, A. Hadj Henni, Dmitry Blau, Ch. Finck, Jason Newby, J. Murata, I. Tserruya, Yu. Efremenko, D. M. Lee, Xiaopeng Zong, E. J. Desmond, Masamichi Ishihara, B. Khachaturov, Beomkyu Kim, Jean-Pierre Cussonneau, M. Togawa, J. Hanks, E. Vazquez-Zambrano, D. Roach, S. Belikov, K. S. Joo, Florian Bauer, K. Watanabe, V. Singh, K. Shoji, A. Rakotozafindrabe, P. Tarján, Marisilvia Donadelli, K. M. Kijima, V. Bumazhnov, M. P. Comets, G. B. Kim, Sean A. Kelly, Minghui Liu, Wei Xie, V. S. Pantuev, M. Kasai, T. Matsumoto, K. Kiriluk, M. Chiu, Ajit Kumar Mohanty, Y. Tsuchimoto, Y. Iwanaga, Maya Hachiya Shimomura, I. E. Yushmanov, Eun-Hee Kim, M. Ouchida, Alexei Khanzadeev, Viktor Veszpremi, T. A. Shibata, C. L. Silva, T. Sato, N. Bruner, N. Means, E. Stenlund, Sung Keun Park, J. B. Choi, M. Heffner, P. W. Stankus, Kenneth Francis Read, S. Sawada, J. Ying, A. Franz, K. Hasuko, B. D. Fox, S. Tarafdar, K. S. Sim, J. Hamblen, A. Yu. Semenov, J. Asai, J. H. Bhom, H. A. Gustafsson, T. Ichihara, N. Apadula, R. Tanabe, D. Layton, N. N. Ajitanand, T. V. Moukhanova, Margaret Harvey, V-N. Tram, N. Grau, O. Dietzsch, B. Komkov, E. T. Atomssa, Y. I. Makdisi, Xingguo Li, Junji Tojo, Y. Kwon, J. Gosset, H. Valle, D. Isenhower, A. Toia, L. Mašek, A. G. Hansen, Shingo Sakai, Hirohiko Sato, Takahiro Nakamura, A. V. Kazantsev, Y. Tanaka, E. Mannel, T. K. Shea, J. P. Sullivan, R. Yang, H. Hiejima, Dipanwita Dutta, B. Espagnon, Joakim Nystrand, Eunja Kim, Eva Haslum, B. Lenzi, K. A. Drees, C. Zhang, German Martinez, Motoi Inaba, P. Ružička, Senta Greene, S. Taneja, K. Okada, Jen-Chieh Peng, W. C. Chang, D. McGlinchey, M. I. Nagy, Julia Velkovska, R. M. Wright, L. Tomášek, M. Rosati, M. Velkovsky, S. P. Sorensen, H. En'yo, D. Watanabe, Susumu Oda, A. T. Basye, M. D. Malik, C. L. Woody, A. Berdnikov, J. L. Charvet, Viktor Riabov, K. Imai, P. Constantin, M. J. Leitch, E. Vznuzdaev, H. Qu, H. J. Moon, F. Staley, L. Baksay, O. Chvala, M. Nihashi, A. Durum, B. Fadem, E. O'Brien, Gary Grim, M. J. Tannenbaum, Rushan Han, S. Esumi, S. Batsouli, K. V. Dharmawardane, A. Caringi, T. E. Miller, K. Karatsu, Inkyu Park, M. Inuzuka, R. A. Soltz, D. S. Brown, K. Yamaura, Z. Conesa del Valle, Hideki Hamagaki, K. Aoki, Seong H. Kim, Charles Maguire, S. Leckey, Takafumi Niida, Anne Marie Sickles, A. A. Vinogradov, Henrik Tydesjö, T. C. Awes, Kyoichiro Ozawa, T. Liška, R. Santo, Jiangyong Jia, Y. Goto, A. Ster, A. Enokizono, J. S. Bok, Jun Kikuchi, J. G. Lajoie, T. Hachiya, David D'Enterria, G. David, M. Grosse Perdekamp, V. V. Ikonnikov, K. I. Hahn, P. Chung, Dong Jo Kim, M. E. Connors, A. Pierson, J. M. Burward-Hoy, Josh Moss, Kiyoshi Tanida, M. K. Dayananda, M. Wysocki, D. Sharma, J. Imrek, D. Kleinjan, R. P. Pisani, D. Mukhopadhyay, R. Ichimiya, S. Rembeczki, S. Butsyk, Vladimir Samsonov, H. Iinuma, I. Otterlund, A. Veicht, A. Datta, E. Kistenev, I. J. Choi, A. Kravitz, J. M. Heuser, M. Gonin, Nikolay Tyurin, D. Bucher, I. V. Sourikova, H. Torii, T. L. Thomas, S. Yokkaichi, A. P.T. Palounek, C. H. Kuberg, G. R. Young, L. Sanfratello, David Olle Rickard Silvermyr, T. Jones, Peter Christiansen, K. Das, P. Lichtenwalner, D. Hornback, Tae-Yeon Lee, V.N. Penev, Martin Purschke, M. A. Volkov, J. Chiba, Alice Mignerey, Ryugo S. Hayano, L. D'Orazio, C. A. Aidala, D. Winter, D. Yu Peressounko, C. M. Camacho, E. P. Hartouni, A. Sukhanov, K. Kurita, H. Pereira, Prashant Shukla, G. C. Mishra, Y. Riabov, Kenta Shigaki, P. J. Kroon, Y. Ikeda, A. Taranenko, M. Nguyen, Kazushi Miki, Takao Sakaguchi, Tamas Ferenc Csorgo, T. Kempel, Dong-Hun Kim, J. G. Boissevain, S. F. Pate, Y. Morino, Masashi Kaneta, A. S. Nyanin, C. Klein-Boesing, Ke. Nakamura, Brajesh K. Singh, Rachid Nouicer, Norio Saito, M. Proissl, Tsutomu Mibe, J. L. Nagle, H. Al-Bataineh, X. R. Wang, K. Katou, A. D. Frawley, R. Pak, S. Huang, S. H. Aronson, C. Pinkenburg, V. Papavassiliou, W. Holzmann, Sébastien Gadrat, D. Kotchetkov, M. Stepanov, G. Roche, S. Kametani, T. Horaguchi, Pàl Hidas, J. H. Kang, J. S. Haggerty, A. Romana, A. Morreale, M. A. L. Leite, Z. Fraenkel, J. L. Drachenberg, Y. S. Lai, R. K. Choudhury, S. C. Johnson, B. Azmoun, Y. J. Mao, A. Král, M. J. Kweon, Y. Le Bornec, M. Oka, K. S. Lee, P. Liebing, C. A. Ogilvie, T. K. Hemmick, R. Belmont, J. S. Kapustinsky, J. M. Durham, V. Babintsev, A. Kiss, Henner Buesching, Steve Edwards, Yasuo Miake, P. Chand, Marcus Hohlmann, L. A. Linden Levy, P. Mikeš, X. Jiang, L. Kochenda, M. Issah, H. Kobayashi, Agneta Oskarsson, Y. Berdnikov, Y. Akiba, M. Mishra, S. Nagamiya, Kazuhiro Tanaka, K. Sakashita, Vaclav Vrba, Klaus Johannes Reygers, R. Kohara, Jason Kamin, M. Csanad, Rui Wei, S. P. Stoll, S. S.E. Rosendahl, G. Bunce, J.-G. Park, A. Churyn, D. Jouan, Ferenc Deák, N. Kamihara, Aram Kim, R. Armendariz, C. Oakley, A. Drees, Xiao-yan Li, K. O. Eyser, K. Fujiwara, S. W. Nam, Y. L. Yamaguchi, I. Ravinovich, M. Bai, S. S. Ryu, Zhiying You, R. Bennett, H. W. Van Hecke, M. Kawashima, Ahmed Al-Jamel, M. Finger, S. Dairaku, O. Zaudtke, M. Virius, C. H. Chen, Y. Cobigo, J. E. Frantz, Jongmin Lee, Herve Borel, A. Glenn, A. Taketani, D. S. Jumper, V. L. Rykov, T. Dahms, X. He, Y. Aramaki, V. Peresedov, J. Koster, H. Masui, A. K. Dubey, A. A. Bickley, S. Takagi, S. Y. Fung, B. Meredith, K. N. Barish, S. Bathe, F. Matathias, Kensuke Homma, E. Richardson, John Hill, K. Oyama, S. Chernichenko, S. Sano, H. Lim, B. Bassalleck, Toru Sugitate, L. D. Isenhower, T. J. Uam, M. Konno, M. L. Brooks, B. Love, François Fleuret, Marie Germain, A. G. Litvinenko, J. T. Mitchell, Osamu Jinnouchi, F. K. Wohn, A. Kozlov, R. Seto, K. Haruna, Matthew G. Reuter, Takahiro Fusayasu, R. Seidl, Vladislav Manko, I. D. Ojha, Alexander Malakhov, V. Dzhordzhadze, I. Danchev, L. S. Zolin, W. J. Park, Christopher Rosen, P. D. Barnes, A. Yanovich, S. N. White, Deepa Thomas, T. Chujo, Zvi Hirsh Citron, K. Nakano, W. E. Sondheim, D. Ivanischev, K. Boyle, P. A. Rukoyatkin, X. Camard, C. Vale, B. S. Chang, J. Klay, Y. Nakamiya, D. Lynch, G. Baksay, M. T. Bjorndal, B. Sahlmueller, Y. J. Kim, A. Deshpande, Y. Watanabe, I. Younus, A. Soldatov, D. Kawall, H. Themann, V. I. Kochetkov, Gerd Joachim Kunde, I. Shein, M. Kurosawa, Saskia Mioduszewski, K. Sedgwick, Alberto Baldisseri, Yves Roland Schutz, D. Pal, J. Jin, M. Naglis, E. M. Takagui, C. Baumann, C. P. Singh, B. M. Johnson, R. J. Petti, A. Isupov, C. Suire, J. Sziklai, Brian Cole, R. S. Towell, Susumu Sato, M. Muniruzzaman, I. Garishvili, Akio Kiyomichi, F. Wei, and C. Y. Chi

Subjects
Physics, Nuclear and High Energy Physics, Photon, 010308 nuclear & particles physics, Virtual particle, 01 natural sciences, 7. Clean energy, Photon yield, Nuclear physics, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

Direct photons have been measured in root s(NN) = 200 GeV d + Au collisions at midrapidity. A wide p(T) range is covered by measurements of nearly real virtual photons (1 < p(T) < 6 GeV/c) and real photons (5 < p(T) < 16 GeV/c). The invariant yield of the direct photons in d + Au collisions over the scaled p + p cross section is consistent with unity. Theoretical calculations assuming standard cold-nuclear-matter effects describe the data well for the entire p(T) range. This indicates that the large enhancement of direct photons observed in Au + Au collisions for 1.0 < p(T) < 2.5 GeV/c is attributable to a source other than the initial-state nuclear effects.

Published
2013
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28. Nuclear-modification factor for open-heavy-flavor production at forward rapidity in Cu+Cu collisions atsNN=200GeV

Author

Tadaaki Isobe, T. E. Miller, P. L. McGaughey, I. Tserruya, P. Chung, W. S. Emam, M. Chiu, S. F. Pate, Yu. Efremenko, H. Al-Bataineh, V. Singh, V. Papavassiliou, Sébastien Gadrat, T. A. Shibata, S. Takagi, K. N. Barish, M. L. Brooks, A. V. Kazantsev, Mate Csanad, L. Tomášek, P. Mikeš, Robert F. Hobbs, D. Isenhower, A. Toia, L. Mašek, B. Love, Alexander Milov, A. G. Litvinenko, T. C. Awes, Kyoichiro Ozawa, T. Liška, D. E. Fields, I. Nakagawa, B. V. Jacak, Jun Kikuchi, O. Drapier, Frank Ellinghaus, A. Kozlov, E. R. Kinney, R. Seto, H. Kanou, Taku Gunji, H. Gong, R. Vértesi, G. S. Kyle, Debashish Pal, D. P. Morrison, K. Haruna, M. McCumber, J. Seele, S. Sawada, S. Campbell, F. Kajihara, V. E. Semenov, J. Ying, A. Franz, Minghui Liu, J. Zimányi, X. He, O. O. Omiwade, M. Heffner, Tatsuya Chujo, K. Dehmelt, H. Delagrange, Kenneth Francis Read, V. Peresedov, Jen-Chieh Peng, S. Zhou, N. N. Ajitanand, S. Batsouli, H. Masui, A. K. Dubey, A. A. Bickley, Xiong Wang, Dong Jo Kim, M. Mitrovski, James Alexander, Takahiro Nakamura, Susumu Oda, J. Egdemir, C. Silvestre, Hiroaki Ohnishi, M. B. Deaton, M. Wysocki, A. Durum, Steven E. Skutnik, Jason Kamin, S. P. Stoll, R. Averbeck, Byung-Sik Hong, David D'Enterria, S. S.E. Rosendahl, G. Bunce, A. Bazilevsky, Marisilvia Donadelli, Y. Tanaka, M. Ouchida, Philippe Rosnet, A. Churyn, V. Bumazhnov, M. P. Comets, J. Chiba, D. Jouan, Jan Rak, R. Lacey, R. Pak, N. Kamihara, K. S. Joo, V. S. Pantuev, R. Armendariz, Alexandre Lebedev, H. Qu, Andry Malala Rakotozafindrabe, A. Drees, J. Asai, R. Granier de Cassagnac, A. Adare, D. M. Lee, H. Iinuma, R. A. Soltz, J. T. Mitchell, J. Kubart, O. Dietzsch, F. Staley, L. Baksay, Hideki Hamagaki, K. Aoki, G. David, E. T. Atomssa, Shingo Sakai, H. Valle, J. E. Frantz, C. A. Ogilvie, R. Seidl, T. K. Hemmick, Yasuo Miake, Y. L. Yamaguchi, Vladislav Manko, B. Komkov, A. P.T. Palounek, L. Kochenda, H. Pei, M. Issah, M. N. Wagner, C. L. Woody, Takao Sakaguchi, Junji Tojo, M. Slunečka, Norio Saito, C. Klein-Boesing, M. D. Malik, E. Vznuzdaev, M. A. L. Leite, Eva Haslum, B. Lenzi, Julia Velkovska, Rushan Han, S. Esumi, N. Grau, D. Sharma, S. Belikov, S. Butsyk, K. Shoji, K. S. Sim, V. Dzhordzhadze, A. D. Frawley, Vladimir Samsonov, P. W. Stankus, E. J. Desmond, K. Okada, Y. Kwon, S. Afanasiev, A. Ster, T. Tabaru, A. Garishvili, V. Babintsev, Xingguo Li, M. Togawa, I. V. Sourikova, H. Hiejima, S. H. Aronson, Tae-Yeon Lee, T. L. Thomas, Tamas Ferenc Csorgo, W. A. Zajc, Martin Purschke, M. Grosse Perdekamp, B. Sahlmueller, H. En'yo, J. Park, L. Aphecetche, V. Baublis, A. Denisov, M. J. Leitch, V. Cianciolo, S. P. Sorensen, Dylan Walker, Y. Fukao, E. H. Kim, J. L. Nagle, J. Newby, C. Vale, Charles Maguire, Y. Tsuchimoto, Ryugo S. Hayano, W. Holzmann, Maya Hachiya Shimomura, K. Imai, Sergey Fokin, B. S. Chang, Y. Riabov, T. Horaguchi, Y. I. Makdisi, Christine Angela Aidala, Kiyoshi Tanida, Kenta Shigaki, M. Rosati, I. E. Yushmanov, D. Kotchetkov, J. Klay, M. Nguyen, E. Kistenev, Anne Marie Sickles, C. R. Cleven, Johannes Peter Wessels, Alexei Khanzadeev, J. G. Lajoie, A. Morreale, T. Hachiya, A. S. Nyanin, Rachid Nouicer, A. Hadj Henni, E. Stenlund, D. Hornback, Z. Fraenkel, H. A. Gustafsson, H. Sakata, K. Das, F. Matathias, C. Haegemann, Y. Inoue, H. Harada, K. Boyle, Wei Xie, M. K. Lee, M. J. Tannenbaum, C. Zhang, A. A. Vinogradov, Kensuke Homma, M. Naglis, Dong-Hun Kim, C. L. Silva, I. J. Choi, A. Kravitz, G. R. Young, A. Taranenko, E. P. Hartouni, M. Gonin, Kazushi Miki, Jiangyong Jia, D. Mukhopadhyay, P. Constantin, Y. Goto, S. Chernichenko, B. Azmoun, Viktor Riabov, A. Král, S. Rembeczki, B. Bassalleck, M. J. Kweon, K. O. Eyser, A. K. Purwar, M. Konno, T. V. Moukhanova, K. Fujiwara, Masayasu Ishihara, K. Kurita, H. Pereira, D. Winter, Y. Nakamiya, M. Oka, Susumu Sato, G. Baksay, D. Yu Peressounko, P. Tarján, A. Dion, A. Deshpande, A. Enokizono, Herve Borel, D. Lynch, Y. Watanabe, I. Younus, A. Taketani, H. W. Van Hecke, A. Soldatov, Senta Greene, D. Kawall, V. I. Kochetkov, B. E. Norman, E. O'Brien, J. Murata, A. Kiss, V. L. Rykov, T. Dahms, Gerd Joachim Kunde, I. Shein, Z. Yasin, Henner Buesching, Alberto Baldisseri, Marcus Hohlmann, S. Bathe, Agneta Oskarsson, Y. Berdnikov, Y. Akiba, M. Mishra, S. Nagamiya, Vaclav Vrba, Klaus Johannes Reygers, O. Zaudtke, M. Virius, S. N. White, K. Nakano, W. E. Sondheim, P. A. Rukoyatkin, John Hill, Saskia Mioduszewski, H. A. Torii, Toru Sugitate, L. D. Isenhower, A. Glenn, I. Ravinovich, François Fleuret, T. Ichihara, Osamu Jinnouchi, Matthew G. Reuter, Takahiro Fusayasu, Y. Nagata, A. Shevel, T. Hester, Alexander Malakhov, V-N. Tram, D. Silvermyr, L. S. Zolin, W. J. Park, Motoi Inaba, P. D. Barnes, A. Yanovich, R. Bennett, M. Finger, J. G. Boissevain, Masashi Kaneta, C. Pinkenburg, M. Stepanov, G. Roche, J. Gosset, S. Yokkaichi, Y. J. Mao, S. Kametani, J. H. Kang, J. S. Haggerty, A. Romana, Y. S. Lai, J. Jin, E. M. Takagui, C. P. Singh, B. M. Johnson, A. Isupov, C. Suire, J. Sziklai, Brian Cole, R. S. Towell, I. Garishvili, Akio Kiyomichi, N. Kurihara, C. Y. Chi, and J. L. Charvet

Subjects
Semileptonic decay, Physics, Nuclear and High Energy Physics, Particle physics, Muon, Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, 01 natural sciences, Upper and lower bounds, Spectral line, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Rapidity, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

Background: Heavy-flavor production in p + p collisions is a good test of perturbative-quantum-chromodynamics (pQCD) calculations. Modification of heavy-flavor production in heavy-ion collisions relative to binary-collision scaling from p + p results, quantified with the nuclear-modification factor (R-AA), provides information on both cold-and hot-nuclear-matter effects. Midrapidity heavy-flavor R-AA measurements at the Relativistic Heavy Ion Collider have challenged parton-energy-loss models and resulted in upper limits on the viscosity-entropy ratio that are near the quantum lower bound. Such measurements have not been made in the forward-rapidity region. Purpose: Determine transverse-momentum (p(T)) spectra and the corresponding R-AA for muons from heavy-flavor meson decay in p + p and Cu + Cu collisions at root s(NN) = 200 GeV and y = 1.65. Method: Results are obtained using the semileptonic decay of heavy-flavor mesons into negative muons. The PHENIX muon-arm spectrometers measure the p(T) spectra of inclusive muon candidates. Backgrounds, primarily due to light hadrons, are determined with a Monte Carlo calculation using a set of input hadron distributions tuned to match measured-hadron distributions in the same detector and statistically subtracted. Results: The charm-production cross section in p + p collisions at root s = 200 GeV, integrated over p(T) and in the rapidity range 1.4 < y < 1.9, is found to be d(sigma e (e) over bar)/dy = 0.139 +/- 0.029 (stat)(-0.058)(+0.051) (syst) mb. This result is consistent with a perturbative fixed-order-plus-next-to-leading-log calculation within scale uncertainties and is also consistent with expectations based on the corresponding midrapidity charm-production cross section measured by PHENIX. The R-AA for heavy-flavor muons in Cu + Cu collisions is measured in three centrality bins for 1 < p(T) < 4 GeV/c. Suppression relative to binary-collision scaling (R-AA < 1) increases with centrality. Conclusions: Within experimental and theoretical uncertainties, the measured charm yield in p + p collisions is consistent with state-of-the-art pQCD calculations. Suppression in central Cu + Cu collisions suggests the presence of significant cold-nuclear-matter effects and final-state energy loss.

Published
2012
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29. Primary proton beam line at the J-PARC hadron experimental facility

Author

Yutaka Yamanoi, Yoshihiro Suzuki, Hiroyuki Noumi, Yoshinori Sato, Yoshihisa Shirakabe, Yoji Katoh, Minoru Takasaki, Keizo Agari, Akihisa Toyoda, Michifumi Minakawa, Masami Iio, Megumi Naruki, Ryotaro Muto, Masaharu Ieiri, S. Sawada, Hiroaki Watanabe, Kazuhiro Tanaka, Hitoshi Takahashi, Akio Kiyomichi, and Erina Hirose

Subjects
Physics, Proton, Nuclear Theory, Hadron, General Physics and Astronomy, Particle accelerator, law.invention, Nuclear physics, Beamline, law, Antiproton, Physics::Accelerator Physics, High Energy Physics::Experiment, J-PARC, Particle physics experiments, Nuclear Experiment, Beam (structure)
Abstract

A brief description of the primary beam line at the hadron experimental facility at the Japan Proton Accelerator Research Complex (J-PARC) is presented. The facility has been constructed in Tokai, Japan, and the first beam was successfully introduced into the experimental hall in January 2009. The facility utilizes a high-intensity proton beam with an energy of 50 GeV and a power of 750 kW and provides various secondary beams such as pions, kaons, and antiprotons for nuclear and particle physics experiments. We have developed beam-line components with sufficient radiation hardness and heat resistance to handle the high-power proton beam.

Published
2012
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30. Heavy-quark production inp+pand energy loss and flow of heavy quarks in Au + Au collisions atsNN=200GeV

Author

S. Y. Fung, M. Chiu, Maya Hachiya Shimomura, T. A. Shibata, Y. I. Makdisi, Z. Fraenkel, Steven E. Skutnik, S. Bathe, John Hill, Agneta Oskarsson, V. S. Pantuev, H. A. Torii, Toru Sugitate, L. D. Isenhower, Y. Berdnikov, Y. Akiba, M. Harvey, M. J. Tannenbaum, J. T. Mitchell, R. Seidl, Vladislav Manko, M. Slunečka, D. Isenhower, A. Toia, L. Mašek, M. Mishra, S. Nagamiya, Kazuhiro Tanaka, Vaclav Vrba, Klaus Johannes Reygers, H. Qu, C. Vale, Junji Tojo, B. S. Chang, Christine Angela Aidala, J. Klay, D. Mukhopadhyay, S. Rembeczki, M. Rosati, François Fleuret, D. Bucher, B. Forestier, I. Ravinovich, Y. Nagata, J. Gosset, J. P. Sullivan, R. Vértesi, K. Okada, B. Sahlmueller, H. En'yo, P. Constantin, Saskia Mioduszewski, S. N. White, S. F. Pate, Anne Marie Sickles, S. Kelly, Hideki Hamagaki, K. Aoki, G. David, F. Matathias, S. S. Ryu, M. J. Leitch, M. Gonin, J. Chiba, N. N. Ajitanand, Mate Csanad, P. Tarján, A. A. Vinogradov, Henrik Tydesjö, K. Nakano, Kensuke Homma, S. Chernichenko, H. Lim, B. Bassalleck, M. Konno, Y. Nakamiya, G. C. Mishra, G. Baksay, M. T. Bjorndal, R. Bennett, Ahmed Al-Jamel, M. Finger, Y. L. Yamaguchi, B. Komkov, Takao Sakaguchi, H. Al-Bataineh, W. E. Sondheim, Norio Saito, Takahiro Nakamura, M. A. L. Leite, C. Klein-Boesing, K. Dehmelt, A. Kiss, D. Kawall, C. L. Woody, Z. Yasin, Henner Buesching, Jiangyong Jia, Y. Goto, O. Zaudtke, A. D. Frawley, T. Tabaru, Jen-Chieh Peng, S. Yokkaichi, P. A. Rukoyatkin, H. Pei, G. R. Young, J. M. Burward-Hoy, H. Pereira, V. I. Kochetkov, Alexei Khanzadeev, J. M. Heuser, T. Ichihara, Osamu Jinnouchi, S. H. Aronson, J. Jin, E. M. Takagui, Marcus Hohlmann, M. Virius, W. Holzmann, C. P. Singh, B. M. Johnson, J. Murata, B. Azmoun, A. Král, M. J. Kweon, Y. Le Bornec, Gerd Joachim Kunde, Matthew G. Reuter, Takahiro Fusayasu, I. D. Ojha, Alexander Malakhov, Susumu Oda, T. Shohjoh, A. Durum, W. C. Smith, V. Babintsev, K. O. Eyser, K. Fujiwara, C. R. Cleven, C. Haegemann, Y. Inoue, Y. Cobigo, D. Silvermyr, V. Papavassiliou, Sébastien Gadrat, A. Isupov, C. Suire, I. Shein, D. S. Brown, Jan Rak, Xiong Wang, J. G. Boissevain, I. V. Sourikova, Masashi Kaneta, R. Pak, N. Kamihara, X. He, O. O. Omiwade, V. Peresedov, Dong Jo Kim, E. Stenlund, H. Sakata, M. K. Lee, E. H. Kim, L. S. Zolin, David D'Enterria, P. J. Kroon, Dong-Hun Kim, P. D. Barnes, J. E. Frantz, Hiroaki Ohnishi, R. Lacey, J. Sziklai, W. J. Park, Alberto Baldisseri, R. Armendariz, C. Pinkenburg, A. Yanovich, M. Oka, S. K. Tuli, R. Granier de Cassagnac, Herve Borel, D. Lynch, A. Adare, M. Naglis, Senta Greene, D. E. Fields, K. Hasuko, B. V. Jacak, Brian Cole, R. P. Pisani, C. L. Silva, R. S. Towell, M. Stepanov, G. Roche, Kazuyoshi Kurita, H. Masui, A. K. Dubey, A. Glenn, O. Dietzsch, E. T. Atomssa, Masayasu Ishihara, Y. J. Mao, S. Kametani, A. Dion, Susumu Sato, I. Garishvili, Akio Kiyomichi, M. Mitrovski, A. Deshpande, M. McCumber, A. K. Purwar, H. Valle, Alexander Milov, I. Nakagawa, H. W. Van Hecke, V. L. Rykov, T. Dahms, A. A. Bickley, A. Drees, N. Grau, J. H. Kang, J. S. Haggerty, T. V. Moukhanova, K. Shoji, J. Kubart, O. Drapier, Frank Ellinghaus, B. E. Norman, Xiao-yan Li, N. Kurihara, S. Takagi, M. Ouchida, Nikolay Tyurin, Y. Watanabe, Atsushi Taketani, K. N. Barish, E. R. Kinney, I. Younus, D. P. Morrison, S. Campbell, E. O'Brien, R. A. Soltz, Julia Velkovska, P. W. Stankus, A. Soldatov, J. Asai, A. Enokizono, M. Wysocki, V. E. Semenov, M. B. Deaton, E. J. Desmond, M. N. Wagner, Y. Fukao, G. S. Kyle, A. Shevel, M. Grosse Perdekamp, Y. Tanaka, N. Willis, James Alexander, K. S. Sim, Tatsuya Chujo, Y. S. Lai, I. Tserruya, M. G. Hur, C. Y. Chi, Tae-Yeon Lee, J. Egdemir, M. Togawa, Yu. Efremenko, V. Singh, T. K. Shea, R. Averbeck, Martin Purschke, T. Hester, Robert F. Hobbs, Byung-Sik Hong, A. Bazilevsky, Y. Kwon, Joakim Nystrand, J. Park, M. L. Brooks, Florian Bauer, Philippe Rosnet, Jason Kamin, F. Gastineau, H. Hiejima, B. Love, Alexandre Lebedev, F. Staley, L. Baksay, K. Das, D. Winter, Charles Maguire, S. Leckey, D. Yu Peressounko, D. M. Lee, Marie Germain, S. P. Stoll, Eva Haslum, B. Lenzi, Shingo Sakai, Josh Moss, Kiyoshi Tanida, Xingguo Li, Debashish Pal, Y. Tsuchimoto, J. L. Drachenberg, S. Sawada, E. P. Hartouni, A. G. Litvinenko, K. Imai, E. Kistenev, Hirohiko Sato, J. Ying, A. Franz, T. L. Thomas, H. Harada, S. S.E. Rosendahl, G. Bunce, D. Kotchetkov, A. Kozlov, R. Seto, S. P. Sorensen, K. Haruna, Dylan Walker, B. Espagnon, V. Dzhordzhadze, S. Afanasiev, A. Morreale, V-N. Tram, I. E. Yushmanov, J. G. Lajoie, A. Churyn, D. Jouan, A. Ster, T. Hachiya, Motoi Inaba, I. J. Choi, A. Kravitz, Ryugo S. Hayano, A. Romana, J. Newby, K. S. Joo, Y. Riabov, Kenta Shigaki, C. A. Ogilvie, T. K. Hemmick, D. Hornback, M. Nguyen, A. Taranenko, Yasuo Miake, Kazushi Miki, S. Esumi, D. Sharma, A. S. Nyanin, L. Kochenda, Rachid Nouicer, T. Kawagishi, S. Belikov, L. Aphecetche, Minghui Liu, M. Heffner, C. Silvestre, Kenneth Francis Read, A. V. Kazantsev, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, L. Tomášek, P. Mikeš, Andry Malala Rakotozafindrabe, T. C. Awes, Kyoichiro Ozawa, T. Liška, Jun Kikuchi, Johannes Peter Wessels, Tadaaki Isobe, J. S. Chai, P. L. McGaughey, Rushan Han, M. N. Hagiwara, M. Issah, C. Zhang, J. Zimányi, S. Butsyk, Vladimir Samsonov, M. D. Malik, I. Otterlund, E. Vznuzdaev, Viktor Riabov, W. A. Zajc, Tamas Ferenc Csorgo, V. Baublis, A. Hadj Henni, J. L. Nagle, A. Denisov, V. Cianciolo, Sergey Fokin, T. Horaguchi, K. Boyle, H. Å Gustafsson, Wei Xie, S. Batsouli, H. Iinuma, M. C. McCain, A. P.T. Palounek, H. Kanou, Taku Gunji, H. Gong, J. Seele, F. Kajihara, H. Delagrange, S. Zhou, Y. S. Kim, J. L. Charvet, T. E. Miller, P. Chung, M. Holmes, and W. S. Emam

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Electron, 01 natural sciences, 7. Clean energy, Spectral line, Nuclear physics, Flow (mathematics), 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Anisotropy, Relativistic Heavy Ion Collider
Abstract

Transverse momentum spectra of electrons (p(T)(e)) from semileptonic weak decays of heavy-flavor mesons in the range of 0.3 < p(T)(e) < 9.0 GeV/c have been measured at midrapidity (|y| < 0.35) by the PHENIX experiment at the Relativistic Heavy Ion Collider in p + p and Au + Au collisions at root s(NN) = 200 GeV. In addition, the azimuthal anisotropy parameter v(2) has been measured for 0.3 < p(T)(e) < 5.0 GeV/c in Au + Au collisions. The substantial modification in the p(T)(e) spectra in Au + Au compared with p + p collisions as well as the nonzero v(2) indicate substantial interactions and flow of heavy quarks in traversing the produced medium. Comparisons of these observables with detailed theoretical calculations can be used to identify the nature of these interactions and to quantify their extent.

Published
2011
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31. Event structure and double helicity asymmetry in jet production from polarizedp+pcollisions ats=200 GeV

Author

Maya Hachiya Shimomura, J. H. Kang, J. S. Haggerty, A. Romana, R. Pak, N. Kamihara, Y. I. Makdisi, Y. Nakamiya, G. Baksay, R. Armendariz, Kazuyoshi Kurita, A. Drees, J. L. Charvet, J. Kubart, E. H. Kim, Y. S. Lai, M. J. Tannenbaum, T. E. Miller, D. Mukhopadhyay, R. A. Soltz, John Hill, C. A. Ogilvie, Herve Borel, D. Lynch, S. Rembeczki, X. He, O. O. Omiwade, T. K. Hemmick, M. Grosse Perdekamp, S. P. Sorensen, H. A. Torii, Yasuo Miake, Dylan Walker, Toru Sugitate, L. D. Isenhower, J. Gosset, P. Chung, V. Peresedov, L. Kochenda, S. Yokkaichi, M. Rosati, J. G. Boissevain, Masashi Kaneta, V. L. Rykov, T. Dahms, Charles Maguire, S. Butsyk, A. Kiss, Vladimir Samsonov, L. Aphecetche, C. Pinkenburg, W. S. Emam, H. Kanou, M. Stepanov, G. Roche, Taku Gunji, H. Gong, J. Seele, R. Vértesi, A. V. Kazantsev, F. Kajihara, Z. Yasin, Henner Buesching, S. Batsouli, H. Masui, A. K. Dubey, H. Delagrange, J. Chiba, N. N. Ajitanand, A. A. Bickley, K. Dehmelt, C. R. Cleven, C. Haegemann, Y. Inoue, A. A. Vinogradov, S. Afanasiev, François Fleuret, B. Love, Marcus Hohlmann, V. S. Pantuev, S. Zhou, J. G. Lajoie, T. Hachiya, I. J. Choi, A. Kravitz, D. Winter, D. Yu Peressounko, S. F. Pate, A. Ster, J. Egdemir, Jason Kamin, Jiangyong Jia, Y. Goto, Kiyoshi Tanida, E. Kistenev, J. T. Mitchell, A. G. Litvinenko, R. Seidl, Vladislav Manko, P. MikeÅ, Takao Sakaguchi, Dong-Hun Kim, M. Slunečka, Y. L. Yamaguchi, B. Komkov, Johannes Peter Wessels, S. N. White, Tamas Ferenc Csorgo, A. Hadj Henni, J. L. Nagle, M. Gonin, Jen-Chieh Peng, Jan Rak, R. Lacey, P. Tarján, H. Al-Bataineh, Takahiro Nakamura, S. P. Stoll, J. Newby, O. Zaudtke, S. Belikov, C. Klein-Boesing, Junji Tojo, Mate Csanad, K. Boyle, M. Ouchida, Norio Saito, C. Silvestre, M. A. L. Leite, H. Harada, H. Pereira, K. Nakano, J. Asai, A. Kozlov, M. Virius, R. Seto, N. Grau, Wei Xie, R. Granier de Cassagnac, A. Adare, D. Hornback, Xiong Wang, C. Vale, B. S. Chang, J. E. Frantz, K. Haruna, A. Taranenko, S. S.E. Rosendahl, Susumu Oda, W. A. Zajc, V. Baublis, A. Denisov, V. Cianciolo, T. A. Shibata, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Andry Malala Rakotozafindrabe, Kazushi Miki, W. E. Sondheim, K. Okada, Senta Greene, Dong Jo Kim, M. B. Deaton, Y. Tanaka, Hiroaki Ohnishi, V. Papavassiliou, Sébastien Gadrat, Christine Angela Aidala, J. Klay, B. Sahlmueller, H. En'yo, D. Isenhower, A. Toia, P. A. Rukoyatkin, T. Ichihara, Osamu Jinnouchi, A. D. Frawley, T. Tabaru, S. H. Aronson, Shingo Sakai, T. L. Thomas, Alexei Khanzadeev, E. Stenlund, H. Sakata, S. Takagi, B. E. Norman, K. N. Barish, E. O'Brien, Matthew G. Reuter, Takahiro Fusayasu, F. Matathias, K. Das, E. P. Hartouni, M. J. Leitch, A. Durum, K. Shoji, Ryugo S. Hayano, K. O. Eyser, A. K. Purwar, K. Fujiwara, Kensuke Homma, P. W. Stankus, Sergey Fokin, T. C. Awes, Y. Riabov, Kyoichiro Ozawa, Kenta Shigaki, F. Staley, L. Baksay, Rushan Han, V. Babintsev, T. Horaguchi, Jun Kikuchi, Eva Haslum, B. Lenzi, Alexander Malakhov, D. Silvermyr, Alexander Milov, A. Glenn, I. Ravinovich, M. Nguyen, I. Nakagawa, P. Constantin, Steven E. Skutnik, W. Holzmann, H. Pei, M. Mitrovski, L. S. Zolin, W. J. Park, David D'Enterria, A. S. Nyanin, S. Chernichenko, Rachid Nouicer, M. Issah, Y. Nagata, O. Drapier, Frank Ellinghaus, G. S. Kyle, O. Dietzsch, K. S. Sim, V. Dzhordzhadze, E. R. Kinney, E. T. Atomssa, M. K. Lee, Y. Kwon, Xingguo Li, D. P. Morrison, S. Campbell, B. Bassalleck, C. L. Woody, M. Wysocki, H. W. Van Hecke, H. Valle, M. D. Malik, L. TomáÅek, P. D. Barnes, E. Vznuzdaev, A. Yanovich, H. Qu, D. E. Fields, James Alexander, B. V. Jacak, V. E. Semenov, M. Konno, J. Zimányi, H. Hiejima, Tatsuya Chujo, I. Tserruya, R. Averbeck, Robert F. Hobbs, Byung-Sik Hong, T. V. Moukhanova, Yu. Efremenko, S. Bathe, H. Iinuma, V. Singh, Agneta Oskarsson, A. Bazilevsky, Minghui Liu, Hideki Hamagaki, K. Aoki, Julia Velkovska, Y. Berdnikov, G. David, A. P.T. Palounek, M. McCumber, M. N. Wagner, Philippe Rosnet, Y. Akiba, M. Mishra, S. Nagamiya, I. V. Sourikova, E. J. Desmond, Y. Fukao, A. Shevel, Debashish Pal, M. L. Brooks, K. Imai, S. Sawada, Vaclav Vrba, Klaus Johannes Reygers, T. Hester, J. Ying, A. Franz, Alexandre Lebedev, H. A. Gustafsson, M. Togawa, C. Zhang, D. M. Lee, J. Park, V-N. Tram, M. Heffner, Anne Marie Sickles, Kenneth Francis Read, Motoi Inaba, Viktor Riabov, Y. Tsuchimoto, I. E. Yushmanov, G. R. Young, Tadaaki Isobe, R. Bennett, P. L. McGaughey, M. Chiu, M. Finger, B. Azmoun, A. Král, M. J. Kweon, M. Oka, A. Dion, Atsushi Taketani, A. Enokizono, K. S. Joo, T. LiÅka, S. Esumi, D. Sharma, Tae-Yeon Lee, Martin Purschke, D. Kotchetkov, A. Morreale, Z. Fraenkel, G. Bunce, A. Churyn, D. Jouan, A. Deshpande, Y. Watanabe, I. Younus, A. Soldatov, M. Naglis, C. L. Silva, Masayasu Ishihara, Susumu Sato, D. Kawall, V. I. Kochetkov, J. Murata, Gerd Joachim Kunde, I. Shein, Alberto Baldisseri, C. P. Singh, B. M. Johnson, A. Isupov, C. Suire, J. Sziklai, Brian Cole, L. MaÅek, Saskia Mioduszewski, J. Jin, E. M. Takagui, R. S. Towell, I. Garishvili, Akio Kiyomichi, N. Kurihara, C. Y. Chi, Y. J. Mao, and S. Kametani

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Photon, 010308 nuclear & particles physics, media_common.quotation_subject, Lambda, 01 natural sciences, 7. Clean energy, Helicity, Asymmetry, Charged particle, Gluon, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Event generator, media_common
Abstract

We report on the event structure and double helicity asymmetry (A(LL)) of jet production in longitudinally polarized p + p collisions at root s = 200 GeV. Photons and charged particles were measured by the PHENIX experiment at midrapidity vertical bar eta vertical bar 2 GeV/c) photon in the event. Event structure, such as multiplicity, p(T) density and thrust in the PHENIX acceptance, were measured and compared with the results from the PYTHIA event generator and the GEANT detector simulation. The shape of jets and the underlying event were well reproduced at this collision energy. For the measurement of jet A(LL), photons and charged particles were clustered with a seed-cone algorithm to obtain the cluster pT sum (p(T)(reco)). The effect of detector response and the underlying events on p(T)(reco) was evaluated with the simulation. The production rate of reconstructed jets is satisfactorily reproduced with the next-to-leading-order and perturbative quantum chromodynamics jet production cross section. For 4 = 49% we measured Lambda(LL) = -0.0014 +/- 0.0037(stat) at the lowest p(T)(reco) bin (4-5 GeV= c) and -0.0181 +/- 0.0282(stat) at the highest p(T)(reco) bin (10-12 GeV= c) with a beam polarization scale error of 9.4% and a pT scale error of 10%. Jets in the measured p(T)(reco) range arise primarily from hard-scattered gluons with momentum fraction 0: 02 < x < 0: 3 according to PYTHIA. The measured A(LL) is compared with predictions that assume various Delta G(x) distributions based on the Gluck-Reya-Stratmann-Vogelsang parameterization. The present result imposes the limit -a.1 < integral(0.3)(0.02) dx Delta G(x, mu(2) = GeV2) < 0.4 at 95% confidence level or integral(0.3)(0.002) dx Delta G(x, mu(2) = 1 GeV2) < 0.5 at 99% confidence level.

Published
2011
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32. Identified charged hadron production inp+pcollisions ats=200and 62.4 GeV

Author

S. Bathe, K. S. Sim, V. Dzhordzhadze, Y. L. Yamaguchi, B. Komkov, Agneta Oskarsson, L. Aphecetche, Y. Kwon, Mate Csanad, Y. Berdnikov, Y. Akiba, Norio Saito, Hiroaki Ohnishi, K. B. Lee, R. Yang, M. A. L. Leite, H. Hiejima, M. Rosati, M. Mishra, S. Nagamiya, Vaclav Vrba, Klaus Johannes Reygers, Alexander Milov, I. Nakagawa, T. Engelmore, K. Imai, M. Ouchida, J. S. Kapustinsky, S. N. White, V. Babintsev, N. Means, Johannes Peter Wessels, J. Asai, V. S. Pantuev, Y. Ikeda, C. M. Camacho, Tae-Yeon Lee, A. A. Vinogradov, D. Roach, K. M. Kijima, Martin Purschke, O. Drapier, Frank Ellinghaus, E. R. Kinney, D. P. Morrison, S. Campbell, David D'Enterria, C. Baumann, H. Pei, J. G. Boissevain, E. J. Mannel, S. Afanasiev, A. Ster, Prashant Shukla, S. F. Pate, Masashi Kaneta, Zvi Hirsh Citron, R. A. Soltz, Shingo Sakai, H. Liu, Anne Marie Sickles, K. O. Eyser, A. K. Purwar, K. Fujiwara, Jiangyong Jia, Y. Goto, C. P. Singh, H. Iinuma, A. P.T. Palounek, D. Kotchetkov, K. Nakano, B. M. Johnson, V. E. Semenov, J. Zimányi, J. Newby, K. A. Drees, Maya Hachiya Shimomura, Xingguo Li, M. Naglis, C. L. Silva, H. Al-Bataineh, A. Morreale, W. A. Zajc, K. Shoji, M. I. Nagy, M. Issah, V. Baublis, A. Denisov, Y. Tomita, T. L. Thomas, Junji Tojo, I. Ravinovich, E. H. Kim, Tatsuya Chujo, W. E. Sondheim, D. Ivanischev, Sergey Fokin, M. Gonin, A. Isupov, C. Suire, Z. Fraenkel, I. Tserruya, R. Pak, Yu. Efremenko, C. Pinkenburg, Y. I. Makdisi, N. Kamihara, P. A. Rukoyatkin, P. W. Stankus, Masayasu Ishihara, M. D. Malik, E. Vznuzdaev, M. Grosse Perdekamp, D. E. Fields, H. A. Gustafsson, J. Sziklai, C. Zhang, M. N. Wagner, R. Vértesi, R. K. Choudhury, Y. Nagata, V. Singh, M. Bai, B. V. Jacak, Ryugo S. Hayano, G. R. Young, K. S. Joo, Brian Cole, D. Hornback, Y. Riabov, A. Sukhanov, H. Pereira, M. Stepanov, Susumu Sato, G. Roche, Y. J. Mao, S. Butsyk, S. Kametani, T. Horaguchi, B. Meredith, Y. Morino, P. Ružička, K. Okada, H. Hamagaki, R. S. Towell, A. Hadj Henni, Minghui Liu, Vladimir Samsonov, Viktor Riabov, R. Armendariz, Kenta Shigaki, Y. Fukao, A. Shevel, M. Nguyen, M. McCumber, I. Garishvili, Akio Kiyomichi, F. Wei, Y. Onuki, T. Hester, A. Taranenko, D. Kawall, H. Themann, H. W. Van Hecke, M. J. Tannenbaum, John Hill, J. H. Kang, J. S. Haggerty, V. I. Kochetkov, Beomkyu Kim, K. Boyle, Jan Rak, Ajit Kumar Mohanty, Wei Xie, T. A. Shibata, R. Hobbs, N. Kurihara, B. Sahlmueller, Kazushi Miki, M. Heffner, A. S. Nyanin, Kenneth Francis Read, H. En'yo, M. J. Leitch, Rachid Nouicer, G. S. Kyle, James Alexander, R. Lacey, Toru Sugitate, L. D. Isenhower, Kazuyoshi Kurita, A. Drees, A. Romana, J. Murata, H. Torii, Gerd Joachim Kunde, S. Esumi, D. Sharma, R. Granier de Cassagnac, A. Adare, O. Dietzsch, Steven E. Skutnik, R. Bennett, Brajesh K. Singh, C. Y. Chi, E. T. Atomssa, M. B. Deaton, T. Sato, J. E. Frantz, M. Finger, S. Dairaku, A. V. Kazantsev, K. Das, R. Averbeck, Byung-Sik Hong, H. Valle, C. L. Woody, A. Berdnikov, A. Bazilevsky, Philippe Rosnet, R. Ichimiya, Tamas Ferenc Csorgo, K. Dehmelt, D. Mukhopadhyay, I. Shein, S. Rembeczki, Y. Tanaka, J. Kubart, Dipanwita Dutta, K. Sakashita, O. Zaudtke, V. Cianciolo, H. Qu, S. P. Sorensen, Alexandre Lebedev, Jen-Chieh Peng, Alexei Khanzadeev, Dylan Walker, M. Virius, E. P. Hartouni, V-N. Tram, N. Grau, D. M. Lee, L. Tomášek, François Fleuret, A. Kiss, J. L. Nagle, P. Mikeš, B. Azmoun, K. Sedgwick, Alberto Baldisseri, A. Král, F. Matathias, A. Deshpande, M. J. Kweon, E. Stenlund, H. Sakata, Y. S. Lai, Julia Velkovska, N. N. Ajitanand, Takahiro Nakamura, K. Aoki, K. Kiriluk, G. David, J. Egdemir, Z. Yasin, D. Winter, Motoi Inaba, I. V. Sourikova, Xiong Wang, Saskia Mioduszewski, J. Chiba, Y. Watanabe, Seong H. Kim, T. Ichihara, M. Oka, A. Yu. Semenov, Dong Jo Kim, J. G. Lajoie, T. Hachiya, D. Yu Peressounko, Susumu Oda, Jason Kamin, Osamu Jinnouchi, Henner Buesching, S. P. Stoll, A. Glenn, S. Gadrat, C. Silvestre, Kensuke Homma, T. C. Awes, A. Dion, Kyoichiro Ozawa, T. Liška, I. Younus, Takao Sakaguchi, Matthew G. Reuter, Takahiro Fusayasu, J. Gosset, A. Durum, A. Veicht, C. Klein-Boesing, F. Staley, L. Baksay, Eva Haslum, B. Lenzi, P. Tarján, T. V. Moukhanova, C. R. Cleven, C. Haegemann, Y. Inoue, S. S.E. Rosendahl, G. Bunce, Alexander Malakhov, Herve Borel, D. Lynch, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Charles Maguire, Jun Kikuchi, Tadaaki Isobe, I. J. Choi, A. Soldatov, Atsushi Taketani, A. Enokizono, P. Liebing, A. Kravitz, J. Jin, E. M. Takagui, A. D. Frawley, T. Tabaru, Marcus Hohlmann, Andry Malala Rakotozafindrabe, D. Silvermyr, K. Yamaura, D. Isenhower, A. Toia, A. Churyn, E. J. Desmond, V. L. Rykov, T. Dahms, R. Tanabe, D. Layton, S. Huang, S. H. Aronson, P. L. McGaughey, M. Togawa, L. S. Zolin, W. J. Park, J. Park, S. Yokkaichi, T. Kempel, Dong-Hun Kim, Kiyoshi Tanida, E. Kistenev, P. D. Barnes, A. Yanovich, L. Mašek, D. Jouan, W. Holzmann, M. K. Lee, P. Constantin, S. Chernichenko, Y. Tsuchimoto, W. C. Chang, M. Chiu, H. Harada, I. E. Yushmanov, Rushan Han, C. A. Ogilvie, Senta Greene, T. K. Hemmick, B. Bassalleck, Yasuo Miake, A. T. Basye, B. E. Norman, T. Niita, B. Fadem, E. O'Brien, M. Konno, L. Kochenda, H. Kanou, Taku Gunji, H. Gong, J. T. Mitchell, J. Seele, F. Kajihara, R. Seidl, Vladislav Manko, M. Slunečka, H. Delagrange, S. Belikov, C. Vale, B. S. Chang, Christine Angela Aidala, J. Klay, Y. Nakamiya, S. Zhou, G. Baksay, S. D. Rolnick, J. L. Charvet, T. E. Miller, M. Kurosawa, P. Chung, J. Imrek, W. S. Emam, V. Papavassiliou, Debashish Pal, S. Sawada, J. Ying, A. Franz, M. Mitrovski, M. Wysocki, S. Takagi, K. N. Barish, M. L. Brooks, B. Love, A. G. Litvinenko, A. Kozlov, R. Seto, K. Haruna, X. He, O. O. Omiwade, V. Peresedov, J. Koster, S. Batsouli, H. Masui, A. K. Dubey, and A. A. Bickley

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Hadron, 7. Clean energy, 01 natural sciences, Nuclear physics, Baryon, Pion, Antimatter, 0103 physical sciences, Rapidity, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, Nucleon
Abstract

Transverse momentum distributions and yields for pi(+/-), K-+/-, p, and (p) over bar in p + p collisions at root s = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC). These data provide important baseline spectra for comparisons with identified particle spectra in heavy ion collisions at RHIC. We present the inverse slope parameter T-inv, mean transverse momentum , and yield per unit rapidity dN/dy at each energy, and compare them to other measurements at different root s in p + p and p + (p) over bar collisions. We also present the scaling properties such as m(T) scaling and x(T) scaling on the p(T) spectra between different energies. To discuss the mechanism of the particle production in p + p collisions, the measured spectra are compared to next-to-leading-order or next-to-leading-logarithmic perturbative quantum chromodynamics calculations.

Published
2011
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33. Measurement of neutral mesons inp+pcollisions ats=200 GeVand scaling properties of hadron production

Author

X. He, O. O. Omiwade, L. Aphecetche, K. Sakashita, P. Tarján, V. Peresedov, C. L. Woody, A. Berdnikov, J. Egdemir, Jason Kamin, T. Csörgő, S. P. Stoll, W. A. Zajc, J. Koster, V. S. Pantuev, Senta Greene, V. Baublis, A. Denisov, S. S.E. Rosendahl, Johannes Peter Wessels, V. Cianciolo, Y. Tomita, G. Bunce, A. T. Basye, Maya Hachiya Shimomura, M. Rosati, B. Meredith, Sergey Fokin, I. V. Sourikova, E. H. Kim, B. E. Norman, B. Fadem, E. O'Brien, J. T. Mitchell, A. Churyn, A. V. Kazantsev, S. Batsouli, H. Masui, A. K. Dubey, C. Baumann, Junji Tojo, Anne Marie Sickles, C. P. Singh, D. Jouan, B. M. Johnson, A. Isupov, Y. I. Makdisi, M. B. Deaton, J. Sziklai, Brian Cole, John Hill, R. Seidl, A. A. Bickley, R. A. Soltz, K. Okada, Toru Sugitate, L. D. Isenhower, A. Hadj Henni, M. Grosse Perdekamp, B. Sahlmueller, Y. Tanaka, H. En'yo, G. R. Young, S. Takagi, Vladislav Manko, M. J. Leitch, M. J. Tannenbaum, Beomkyu Kim, K. Boyle, Wei Xie, H. A. Gustafsson, M. Ouchida, M. Slunečka, Mate Csanad, N. Means, J. Asai, K. N. Barish, C. A. Ogilvie, G. S. Kyle, H. Torii, François Fleuret, I. Tserruya, C. Zhang, T. K. Hemmick, James Alexander, Yu. Efremenko, M. Mitrovski, P. Ružička, D. Winter, Yasuo Miake, D. Mukhopadhyay, S. Rembeczki, R. Averbeck, Byung-Sik Hong, K. S. Sim, A. Bazilevsky, T. Ichihara, S. Belikov, L. Tomášek, D. Yu Peressounko, P. Mikeš, A. A. Vinogradov, Viktor Riabov, V. Dzhordzhadze, Y. Kwon, Matthew G. Reuter, Philippe Rosnet, Hiroaki Ohnishi, K. B. Lee, Takahiro Fusayasu, Shingo Sakai, K. A. Drees, T. L. Thomas, F. Staley, L. Baksay, V. Singh, S. Bathe, H. Pei, Alexander Malakhov, L. Kochenda, R. Yang, M. Wysocki, H. Hiejima, M. L. Brooks, H. Iinuma, J. Chiba, Ryugo S. Hayano, Y. Riabov, I. Ravinovich, Takao Sakaguchi, B. Azmoun, A. Král, M. J. Kweon, Agneta Oskarsson, M. K. Lee, Alexandre Lebedev, D. M. Lee, K. Kiriluk, Y. L. Yamaguchi, B. Komkov, Y. Berdnikov, Jiangyong Jia, Y. Goto, B. Love, Robert F. Hobbs, Y. Akiba, C. Klein-Boesing, M. I. Nagy, A. P.T. Palounek, R. Pak, N. Kamihara, C. Vale, B. S. Chang, Christine Angela Aidala, J. Klay, M. Issah, Kenta Shigaki, M. Nguyen, M. Mishra, S. Nagamiya, A. D. Frawley, T. Tabaru, K. Imai, Norio Saito, M. D. Malik, E. Vznuzdaev, R. Armendariz, M. A. L. Leite, F. Matathias, K. Das, E. P. Hartouni, David D'Enterria, Vaclav Vrba, Klaus Johannes Reygers, A. G. Litvinenko, S. Huang, Kensuke Homma, R. Vértesi, A. S. Nyanin, S. H. Aronson, Kazuyoshi Kurita, T. C. Awes, Kyoichiro Ozawa, T. Liška, Y. Onuki, K. O. Eyser, A. K. Purwar, K. Fujiwara, J. S. Kapustinsky, P. Constantin, S. Chernichenko, D. Roach, Y. Nagata, A. Drees, W. Holzmann, K. M. Kijima, C. R. Cleven, M. Oka, V. Babintsev, Jun Kikuchi, Jan Rak, Rachid Nouicer, B. Bassalleck, C. Haegemann, Y. Inoue, A. Dion, A. Kozlov, J. Kubart, R. Lacey, Ajit Kumar Mohanty, M. Bai, Debashish Pal, M. Konno, R. Seto, K. Haruna, S. Sawada, R. Granier de Cassagnac, T. A. Shibata, A. Adare, T. Sato, J. E. Frantz, Atsushi Taketani, A. Enokizono, Y. Nakamiya, P. Liebing, M. N. Wagner, Y. Fukao, J. Ying, A. Franz, H. W. Van Hecke, A. Shevel, Charles Maguire, Xingguo Li, Alexei Khanzadeev, Tae-Yeon Lee, G. Baksay, K. Dehmelt, E. Stenlund, Martin Purschke, H. Sakata, T. Hester, Kiyoshi Tanida, A. Kiss, O. Dietzsch, Jen-Chieh Peng, E. Kistenev, Z. Yasin, Henner Buesching, E. T. Atomssa, H. Valle, S. P. Sorensen, Dylan Walker, Dipanwita Dutta, D. Isenhower, T. V. Moukhanova, C. M. Camacho, D. Kotchetkov, Marcus Hohlmann, Prashant Shukla, A. Toia, E. J. Desmond, H. Harada, A. Morreale, Julia Velkovska, V-N. Tram, N. Grau, S. F. Pate, Minghui Liu, L. Mašek, Seong H. Kim, D. E. Fields, M. Togawa, J. Park, T. Kempel, Dong-Hun Kim, Xiong Wang, B. V. Jacak, Z. Fraenkel, Motoi Inaba, M. Heffner, J. G. Lajoie, Y. Tsuchimoto, T. Hachiya, R. Bennett, T. Niita, Dong Jo Kim, Osamu Jinnouchi, Kenneth Francis Read, I. E. Yushmanov, H. Al-Bataineh, I. J. Choi, A. Kravitz, M. McCumber, R. K. Choudhury, Tadaaki Isobe, M. Gonin, K. S. Joo, J. L. Charvet, V. Papavassiliou, M. Finger, Sébastien Gadrat, A. Veicht, P. L. McGaughey, A. Sukhanov, H. Pereira, M. Chiu, Y. Morino, T. E. Miller, M. Kurosawa, Christophe Pierre Suire, Alexander Milov, I. Nakagawa, T. Engelmore, O. Drapier, Frank Ellinghaus, S. Esumi, N. N. Ajitanand, E. R. Kinney, Herve Borel, D. P. Morrison, S. Campbell, D. Lynch, D. Sharma, V. E. Semenov, J. Zimányi, R. Ichimiya, Tatsuya Chujo, P. Chung, Eva Haslum, B. Lenzi, Steven E. Skutnik, J. Imrek, V. L. Rykov, T. Dahms, Takahiro Nakamura, S. Dairaku, W. S. Emam, S. Afanasiev, O. Zaudtke, Susumu Oda, A. Ster, H. Kanou, Taku Gunji, H. Gong, J. Seele, M. Virius, F. Kajihara, J. Newby, H. Delagrange, A. Durum, K. Yamaura, S. Zhou, A. Glenn, S. D. Rolnick, D. Hornback, H. Qu, A. Taranenko, Kazushi Miki, Hideki Hamagaki, K. Aoki, D. Silvermyr, L. S. Zolin, W. J. Park, P. D. Barnes, A. Yanovich, G. David, Brajesh K. Singh, H. Liu, S. N. White, K. Shoji, Zvi Hirsh Citron, K. Nakano, P. W. Stankus, W. E. Sondheim, D. Ivanischev, Saskia Mioduszewski, P. A. Rukoyatkin, J. Jin, E. M. Takagui, R. S. Towell, I. Garishvili, Akio Kiyomichi, F. Wei, N. Kurihara, C. Y. Chi, Y. Ikeda, J. G. Boissevain, E. J. Mannel, Masashi Kaneta, C. Pinkenburg, M. Stepanov, G. Roche, Y. J. Mao, S. Kametani, T. Horaguchi, J. H. Kang, J. S. Haggerty, A. Romana, Y. S. Lai, A. Yu. Semenov, J. Gosset, S. Butsyk, Vladimir Samsonov, S. Yokkaichi, J. L. Nagle, C. Silvestre, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Andry Malala Rakotozafindrabe, R. Tanabe, D. Layton, W. C. Chang, Rushan Han, D. Kawall, H. Themann, V. I. Kochetkov, J. Murata, Gerd Joachim Kunde, I. Shein, K. Sedgwick, Alberto Baldisseri, M. Naglis, C. L. Silva, Masayasu Ishihara, Susumu Sato, A. Deshpande, Y. Watanabe, I. Younus, and A. Soldatov

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Hadron, Omega baryon, 01 natural sciences, 7. Clean energy, Omega, Nuclear physics, Baryon, Particle decay, 0103 physical sciences, Tsallis distribution, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the invariant differential cross section for production of K-S(0), omega, eta', and phi mesons in p + p collisions at root s 200 GeV. Measurements of omega and phi production in different decay channels give consistent results. New results for the omega are in agreement with previously published data and extend the measured p(T) coverage. The spectral shapes of all hadron transverse momentum distributions measured by PHENIX are well described by a Tsallis distribution functional form with only two parameters, n and T, determining the high-p(T) and characterizing the low-p(T) regions of the spectra, respectively. The values of these parameters are very similar for all analyzed meson spectra, but with a lower parameter T extracted for protons. The integrated invariant cross sections calculated from the fitted distributions are found to be consistent with existing measurements and with statistical model predictions.

Published
2011
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34. Nuclear modification factors ofϕmesons ind+Au,Cu+Cu, andAu+Aucollisions atsNN=200 GeV

Author

Aaron Angerami, J. M. Burward-Hoy, W. A. Zajc, V. Baublis, A. Denisov, V. Cianciolo, Hongfang Liu, D. E. Fields, W. C. Smith, H. A. Gustafsson, C. Zhang, B. V. Jacak, P. Ružička, Viktor Riabov, Sergey Fokin, T. Horaguchi, M. McCumber, A. K. Purwar, M. K. Lee, J. L. Drachenberg, R. A. Soltz, H. Borel, Gary Grim, S. Batsouli, K. V. Dharmawardane, M. Grosse Perdekamp, J. Hanks, Prashant Shukla, S. F. Pate, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, M. E. Connors, K. A. Drees, J. Gosset, A. V. Kazantsev, S. Belikov, K. S. Joo, J. L. Charvet, H. Iinuma, M. C. McCain, A. P.T. Palounek, Ke. Nakamura, V. S. Pantuev, Sung Keun Park, S. Kelly, N. N. Ajitanand, J. P. Sullivan, K. Sakashita, D. Watanabe, M. D. Malik, T. E. Miller, K. Tanida, E. Vznuzdaev, Takahiro Nakamura, T. Jones, J. Hamblen, Peter Christiansen, S. P. Sorensen, K. Watanabe, M. Rosati, L. Tomášek, R. Tanabe, H. Al-Bataineh, K. Das, A. Enokizono, Dylan Walker, K. Shoji, D. Winter, D. Yu Peressounko, Y. Fukao, Susumu Oda, A. Shevel, P. Mikeš, P. Tarján, P. Chung, D. Kotov, N. Apadula, R. Vértesi, K. Okada, M. Holmes, E. P. Hartouni, B. Sahlmueller, T. Shohjoh, A. Durum, X. Jiang, S. Yokkaichi, H. En'yo, S. V. Afanasiev, Catherine Micaela Silvestre, L. Aphecetche, P. W. Stankus, P. Constantin, M. J. Leitch, W. S. Emam, A. Datta, D. S. Brown, K. Yamaura, H. Kanou, Y. Ikeda, S. Bathe, J. G. Boissevain, T. Hester, J. Egdemir, Taku Gunji, H. Gong, J. Seele, Masashi Kaneta, T. Tabaru, Senta Greene, F. Kajihara, Agneta Oskarsson, A. Dion, M. I. Nagy, T. C. Awes, H. Delagrange, S. Esumi, Kyoichiro Ozawa, T. Liška, C. Pinkenburg, A. T. Basye, Johannes Peter Wessels, J. S. Bok, O. Chvala, Jun Kikuchi, C. R. Cleven, B. E. Norman, B. Fadem, E. O'Brien, D. Sharma, R. Ichimiya, Jason Kamin, Rushan Han, M. N. Hagiwara, Y. Berdnikov, C. Haegemann, Y. Inoue, A. Hadj Henni, V. Papavassiliou, Sébastien Gadrat, Xiao-yan Li, T. Murakami, M. Stepanov, Robert F. Hobbs, G. Roche, S. Kametani, S. Butsyk, S. Zhou, A. A. Vinogradov, Henrik Tydesjö, Y. Akiba, B. Azmoun, Y. J. Mao, M. Mishra, A. Král, M. J. Kweon, J. H. Kang, Beomkyu Kim, J. S. Haggerty, P. J. Kroon, Wei Xie, Vladimir Samsonov, I. Otterlund, A. Baldisseri, A. Romana, S. Nagamiya, Kazuhiro Tanaka, S. P. Stoll, T. Kempel, S. D. Rolnick, Masamichi Ishihara, Y. Le Bornec, Y. S. Kim, Dong-Hun Kim, S. W. Nam, Vaclav Vrba, Minghui Liu, B. Komkov, Klaus Johannes Reygers, Jiangyong Jia, Y. Goto, M. Chiu, Ajit Kumar Mohanty, Debashish Pal, M. Heffner, Kenneth Francis Read, Tamas Ferenc Csorgo, T. A. Shibata, C. L. Silva, T. Sato, T. Ichihara, Y. S. Lai, J. L. Nagle, J. Murata, M. Oka, S. Sawada, Tadaaki Isobe, J. Ying, A. Franz, Steven E. Skutnik, K. S. Lee, J. S. Chai, Margaret Harvey, V-N. Tram, N. Grau, Norio Saito, Tsutomu Mibe, D. Isenhower, A. Toia, S. S.E. Rosendahl, G. Bunce, M. Slunečka, P. L. McGaughey, B. Espagnon, P. Liebing, Tae-Yeon Lee, M. A. L. Leite, J. G. Lajoie, L. Mašek, Martin Purschke, F. Gastineau, D. Kotchetkov, H. Qu, Alexei Khanzadeev, A. Morreale, Z. Fraenkel, A. Kiss, Motoi Inaba, T. Hachiya, Hideki Hamagaki, K. Aoki, G. David, K. I. Hahn, R. K. Choudhury, A. Churyn, R. Belmont, J. S. Kapustinsky, R. M. Wright, Mate Csanad, M. Mitrovski, V. Babintsev, Z. Yasin, Henner Buesching, E. Stenlund, D. Jouan, G. S. Kyle, Steve Edwards, N. Willis, J. B. Choi, H. Sakata, James Alexander, O. Dietzsch, R. Averbeck, Byung-Sik Hong, A. Bazilevsky, M. Nihashi, E. T. Atomssa, H. Valle, I. J. Choi, A. Kravitz, Philippe Rosnet, J. M. Heuser, Marcus Hohlmann, Alexandre Lebedev, David D'Enterria, Dipanwita Dutta, D. M. Lee, C. A. Ogilvie, Julia Velkovska, R. P. Pisani, M. Gonin, Maya Hachiya Shimomura, M. K. Dayananda, L. A. Linden Levy, T. K. Hemmick, M. Wysocki, J. M. Durham, Nikolay Tyurin, J. H. Bhom, Yasuo Miake, K. O. Eyser, K. Fujiwara, M. N. Wagner, Y. L. Yamaguchi, Y. I. Makdisi, T. V. Moukhanova, L. Kochenda, M. Issah, Dmitry Blau, A. Sukhanov, M. B. Deaton, K. Kurita, H. Pereira, H. W. Van Hecke, Y. Morino, T. Kawagishi, E. J. Desmond, R. Pak, Hiroaki Ohnishi, K. B. Lee, Y. Tanaka, E. Mannel, M. Togawa, E. Vazquez-Zambrano, T. K. Shea, J. Park, Florian Bauer, N. Kamihara, M. J. Tannenbaum, A. Rakotozafindrabe, Aram Kim, M. Kasai, R. Armendariz, Y. Tsuchimoto, Y. Iwanaga, H. Torii, I. E. Yushmanov, C. Oakley, A. Drees, Eun-Hee Kim, H. J. Moon, L. Baksay, J. Kubart, Charles Maguire, S. Leckey, D. Mukhopadhyay, S. Rembeczki, D. Bucher, Josh Moss, D. Kawall, J. Chiba, Alice Mignerey, E. Kistenev, H. Themann, L. D'Orazio, V. I. Kochetkov, G. C. Mishra, P. Lichtenwalner, Takao Sakaguchi, M. Kurosawa, Y. Nakamiya, D. Lynch, C. Klein-Boesing, Gerd Joachim Kunde, H. Harada, I. Shein, A. D. Frawley, H. Pei, G. Baksay, Saskia Mioduszewski, M. T. Bjorndal, K. Sedgwick, S. Huang, S. H. Aronson, S. Dairaku, A. Deshpande, W. Holzmann, O. Zaudtke, Y. J. Kim, J. T. Mitchell, Y. Watanabe, R. Seidl, I. Younus, A. Soldatov, Vladislav Manko, M. Naglis, J. Jin, M. Virius, Susumu Sato, E. M. Takagui, F. Staley, C. Vale, B. S. Chang, R. S. Towell, Christine Angela Aidala, J. Klay, N. Borggren, C. H. Chen, I. Garishvili, Akio Kiyomichi, F. Wei, F. Matathias, Y. Cobigo, Kensuke Homma, E. Richardson, X. He, O. O. Omiwade, S. Chernichenko, J. E. Frantz, Jongmin Lee, H. Lim, Y. Aramaki, V. Peresedov, B. Bassalleck, N. Kurihara, J. Koster, M. Konno, H. Masui, A. K. Dubey, A. Glenn, A. Taketani, A. A. Bickley, D. S. Jumper, B. Love, Marie Germain, V. L. Rykov, T. Dahms, M. G. Hur, C. Y. Chi, A. G. Litvinenko, I. Ravinovich, A. Kozlov, Y. Nagata, R. Seto, M. Bai, K. Haruna, S. S. Ryu, C. Baumann, V. Dzhordzhadze, I. Danchev, S. Takagi, K. N. Barish, Zhiying You, R. Bennett, M. Kawashima, K. S. Sim, C. P. Singh, B. M. Johnson, Ahmed Al-Jamel, M. Finger, S. Sano, Junji Tojo, Y. Kwon, R. J. Petti, R. Yang, H. Hiejima, M. Ouchida, N. Means, A. Isupov, C. Suire, J. Sziklai, I. Tserruya, M. L. Brooks, S. Taneja, Yu. Efremenko, J. Asai, Brian Cole, V. Singh, K. Imai, Shingo Sakai, Hirohiko Sato, S. K. Tuli, Eunja Kim, T. L. Thomas, K. Dehmelt, Jen-Chieh Peng, S. Y. Fung, K. Karatsu, Inkyu Park, Xiong Wang, Z. Conesa del Valle, Anne Marie Sickles, Dong Jo Kim, B. Meredith, A. Veicht, Ryugo S. Hayano, Alexander Milov, I. Nakagawa, T. Engelmore, O. Drapier, John Hill, Frank Ellinghaus, E. R. Kinney, Y. Riabov, D. P. Morrison, S. Campbell, V. E. Semenov, J. Zimányi, Kenta Shigaki, G. R. Young, Tatsuya Chujo, Toru Sugitate, M. Nguyen, L. D. Isenhower, Y. Onuki, A. Ster, D. Roach, K. M. Kijima, A. S. Nyanin, Jan Rak, J. Newby, Rachid Nouicer, Xingguo Li, M. Proissl, R. Lacey, D. Hornback, François Fleuret, B. Forestier, A. Taranenko, Kazushi Miki, Brajesh K. Singh, R. Granier de Cassagnac, A. Adare, C. L. Woody, A. Berdnikov, K. Hasuko, S. Tarafdar, S. N. White, A. Caringi, Joakim Nystrand, Eva Haslum, B. Lenzi, Deepa Thomas, I. V. Sourikova, Zvi Hirsh Citron, K. Nakano, W. E. Sondheim, D. Ivanischev, K. Boyle, P. A. Rukoyatkin, Osamu Jinnouchi, Matthew G. Reuter, Takahiro Fusayasu, I. D. Ojha, Alexander Malakhov, D. Silvermyr, L. S. Zolin, W. J. Park, Christopher Rosen, P. D. Barnes, and A. Yanovich

Subjects
Physics, Nuclear and High Energy Physics, Valence (chemistry), Meson, Proton, 010308 nuclear & particles physics, Hadron, Phi meson, 01 natural sciences, 7. Clean energy, Baryon, Nuclear physics, Antiproton, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

The PHENIX experiment at the Relativistic Heavy Ion Collider has performed systematic measurements of phi meson production in the K+K- decay channel at midrapidity in p + p, d + Au, Cu + Cu, and Au + Au collisions at root s(NN) = 200 GeV. Results are presented on the phi invariant yield and the nuclear modification factor R-AA for Au + Au and Cu + Cu, and R-dA for d + Au collisions, studied as a function of transverse momentum (1 < p(T) < 7 GeV/c) and centrality. In central and midcentral Au + Au collisions, the R-AA of phi exhibits a suppression relative to expectations from binary scaled p + p results. The amount of suppression is smaller than that of the pi(0) and the. in the intermediate p(T) range (2-5 GeV/c), whereas, at higher p(T), the phi, pi(0), and. show similar suppression. The baryon (proton and antiproton) excess observed in central Au + Au collisions at intermediate p(T) is not observed for the phi meson despite the similar masses of the proton and the phi. This suggests that the excess is linked to the number of valence quarks in the hadron rather than its mass. The difference gradually disappears with decreasing centrality, and, for peripheral collisions, the R-AA values for both particle species are consistent with binary scaling. Cu + Cu collisions show the same yield and suppression as Au + Au collisions for the same number of N-part. The R-dA of phi shows no evidence for cold nuclear effects within uncertainties.

Published
2011
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35. HighpTdirect photon andπ0triggered azimuthal jet correlations and measurement ofkTfor isolated direct photons inp+pcollisions ats=200 GeV

Author

Ajit Kumar Mohanty, P. Tarján, T. A. Shibata, T. Sato, David D'Enterria, S. Bathe, Agneta Oskarsson, Alexander Milov, I. Nakagawa, T. Engelmore, O. Drapier, Frank Ellinghaus, Y. Nakamiya, Y. Berdnikov, Y. Akiba, A. V. Kazantsev, E. R. Kinney, D. P. Morrison, S. Campbell, M. Mishra, D. Isenhower, A. Toia, S. Nagamiya, V. E. Semenov, M. N. Wagner, J. Zimányi, C. Baumann, D. Lynch, Tatsuya Chujo, G. Baksay, L. Tomášlek, C. P. Singh, Tae-Yeon Lee, Martin Purschke, L. Mašek, Vaclav Vrba, Klaus Johannes Reygers, I. Tserruya, Yu. Efremenko, S. Butsyk, Vladimir Samsonov, K. Dehmelt, Jen-Chieh Peng, Senta Greene, B. M. Johnson, Xiong Wang, V. Singh, Dong Jo Kim, G. S. Kyle, Osamu Jinnouchi, A. Veicht, James Alexander, A. Isupov, C. Suire, Y. Fukao, T. Niita, A. Shevel, A. T. Basye, B. E. Norman, Maya Hachiya Shimomura, M. Naglis, C. L. Silva, P. Mikeš, J. Sziklai, Y. J. Mao, J. T. Mitchell, S. Kametani, T. Horaguchi, V. L. Rykov, T. Dahms, R. Averbeck, Byung-Sik Hong, Brian Cole, D. Kotchetkov, T. Hester, B. Fadem, I. Ravinovich, Y. I. Makdisi, E. O'Brien, A. Bazilevsky, R. Seidl, J. L. Charvet, Vladislav Manko, M. Slunečka, M. Mitrovski, Philippe Rosnet, B. Love, R. S. Towell, A. Morreale, I. Garishvili, Akio Kiyomichi, F. Wei, Masayasu Ishihara, Y. Nagata, K. O. Eyser, A. K. Purwar, M. Bai, K. Fujiwara, Z. Fraenkel, S. Belikov, Tamas Ferenc Csorgo, R. A. Soltz, H. Borel, E. J. Desmond, T. C. Awes, Kyoichiro Ozawa, T. Liška, T. E. Miller, M. Kurosawa, Jun Kikuchi, H. Iinuma, Alexandre Lebedev, O. Dietzsch, N. Kurihara, E. T. Atomssa, M. J. Tannenbaum, A. G. Litvinenko, D. M. Lee, C. Vale, B. S. Chang, J. L. Nagle, M. Togawa, K. S. Sim, V. Dzhordzhadze, M. Grosse Perdekamp, H. Torii, J. Park, Christine Angela Aidala, R. K. Choudhury, J. Klay, Y. Kwon, H. Valle, Susumu Sato, C. Y. Chi, V-N. Tram, N. Grau, Dipanwita Dutta, Tadaaki Isobe, A. P.T. Palounek, C. A. Ogilvie, K. S. Joo, M. E. Connors, P. Chung, R. Yang, R. Bennett, J. H. Kang, J. S. Haggerty, A. Romana, D. Mukhopadhyay, A. Kozlov, S. Rembeczki, J. Imrek, H. Hiejima, C. L. Woody, A. Berdnikov, K. A. Drees, F. Staley, K. Kiriluk, T. K. Hemmick, M. Wysocki, S. Taneja, R. Seto, K. Haruna, Y. Tsuchimoto, F. Matathias, Saskia Mioduszewski, M. Finger, H. A. Gustafsson, H. W. Van Hecke, Yasuo Miake, P. L. McGaughey, Eva Haslum, J. Chiba, W. S. Emam, M. K. Lee, B. Lenzi, H. Liu, Kensuke Homma, K. Imai, K. Shoji, Motoi Inaba, Julia Velkovska, I. E. Yushmanov, M. Chiu, M. Rosati, P. Constantin, S. Chernichenko, E. H. Kim, S. Dairaku, X. He, O. O. Omiwade, C. Zhang, Alexei Khanzadeev, H. Kanou, Taku Gunji, H. Gong, J. Seele, O. Zaudtke, D. Sharma, D. Winter, D. Kawall, S. Afanasiev, P. W. Stankus, L. Kochenda, B. Bassalleck, A. Ster, H. Themann, J. Jin, M. Konno, V. Peresedov, E. Stenlund, H. Sakata, E. M. Takagui, Takao Sakaguchi, R. Ichimiya, P. Ružička, D. Yu Peressounko, A. Kiss, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, C. Klein-Boesing, J. Newby, J. Koster, F. Kajihara, H. Delagrange, Anne Marie Sickles, M. Virius, B. Azmoun, A. Král, M. J. Kweon, K. Sakashita, A. D. Frawley, T. Tabaru, Robert F. Hobbs, Andry Malala Rakotozafindrabe, Viktor Riabov, Y. S. Lai, S. Batsouli, H. Masui, A. K. Dubey, Z. Yasin, Henner Buesching, V. I. Kochetkov, S. Huang, S. H. Aronson, A. A. Bickley, R. Tanabe, D. Layton, V. S. Pantuev, J. Murata, I. V. Sourikova, J. Egdemir, D. Hornback, Minghui Liu, A. A. Vinogradov, S. Takagi, Jason Kamin, S. Esumi, M. Heffner, S. Zhou, W. Holzmann, K. N. Barish, A. Baldisseri, S. D. Rolnick, M. Oka, C. R. Cleven, G. R. Young, C. Haegemann, Y. Inoue, Junji Tojo, S. P. Stoll, Kenneth Francis Read, A. Taranenko, Jiangyong Jia, Y. Goto, Y. L. Yamaguchi, B. Komkov, A. Dion, T. V. Moukhanova, Gerd Joachim Kunde, I. Shein, W. C. Chang, W. A. Zajc, Y. Ikeda, J. G. Boissevain, E. J. Mannel, Masashi Kaneta, A. Glenn, Kazushi Miki, V. Baublis, A. Denisov, V. Cianciolo, K. Das, R. Vértesi, Y. Onuki, Atsushi Taketani, Marcus Hohlmann, Brajesh K. Singh, S. S.E. Rosendahl, G. Bunce, A. Enokizono, M. Ouchida, T. Kempel, Dong-Hun Kim, K. Sedgwick, P. Liebing, Norio Saito, T. Ichihara, M. A. L. Leite, A. Deshpande, Y. Tomita, Jan Rak, Sergey Fokin, M. L. Brooks, Rushan Han, K. Okada, E. P. Hartouni, R. Lacey, N. Means, J. Asai, B. Sahlmueller, A. Churyn, D. Jouan, Debashish Pal, C. Pinkenburg, R. Granier de Cassagnac, A. Adare, J. E. Frantz, H. En'yo, M. J. Leitch, Steven E. Skutnik, R. Pak, N. Kamihara, S. Sawada, Y. Watanabe, J. S. Kapustinsky, M. Stepanov, G. Roche, A. Yu. Semenov, V. Babintsev, I. Younus, Shingo Sakai, T. L. Thomas, R. Armendariz, J. Ying, A. Franz, H. Qu, Kazuyoshi Kurita, A. Soldatov, J. Gosset, Matthew G. Reuter, A. Drees, Takahiro Fusayasu, J. Kubart, Ryugo S. Hayano, Hideki Hamagaki, K. Aoki, G. David, Y. Riabov, Kenta Shigaki, S. Yokkaichi, M. Nguyen, A. S. Nyanin, Rachid Nouicer, Alexander Malakhov, C. M. Camacho, Prashant Shukla, S. F. Pate, D. Silvermyr, H. Al-Bataineh, L. S. Zolin, W. J. Park, V. Papavassiliou, Sébastien Gadrat, P. D. Barnes, A. Yanovich, S. N. White, Zvi Hirsh Citron, K. Nakano, W. E. Sondheim, D. Ivanischev, P. A. Rukoyatkin, B. Meredith, John Hill, Toru Sugitate, L. D. Isenhower, François Fleuret, Hiroaki Ohnishi, K. B. Lee, D. Roach, K. M. Kijima, Xingguo Li, M. Gonin, A. Sukhanov, H. Pereira, Y. Morino, D. E. Fields, B. V. Jacak, M. B. Deaton, Y. Tanaka, M. McCumber, A. Hadj Henni, S. P. Sorensen, Dylan Walker, Beomkyu Kim, K. Boyle, Seong H. Kim, Wei Xie, J. G. Lajoie, T. Hachiya, N. N. Ajitanand, L. Baksay, I. J. Choi, A. Kravitz, Takahiro Nakamura, Charles Maguire, Susumu Oda, A. Durum, Catherine Micaela Silvestre, K. Yamaura, Kiyoshi Tanida, E. Kistenev, H. Harada, H. Pei, M. I. Nagy, M. Issah, M. D. Malik, E. Vznuzdaev, L. Aphecetche, Johannes Peter Wessels, and Mate Csanad

Subjects
Elastic scattering, Physics, Nuclear and High Energy Physics, Photon, Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Hadron, Compton scattering, Elementary particle, 7. Clean energy, 01 natural sciences, Gluon, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

Correlations of charged hadrons of 1< p(T) < 10 Gev/c with high pT direct photons and pi(0) mesons in the range 5< p(T) < 15 Gev/c are used to study jet fragmentation in the gamma + jet and dijet channels, respectively. The magnitude of the partonic transverse momentum, k(T), is obtained by comparing to a model incorporating a Gaussian kT smearing. The sensitivity of the associated charged hadron spectra to the underlying fragmentation function is tested and the data are compared to calculations using recent global fit results. The shape of the direct photon-associated hadron spectrum as well as its charge asymmetry are found to be consistent with a sample dominated by quark-gluon Compton scattering. No significant evidence of fragmentation photon correlated production is observed within experimental uncertainties.

Published
2010
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36. Enhanced Production of Direct Photons inAu+AuCollisions atsNN=200 GeVand Implications for the Initial Temperature

Author

V. Peresedov, Marisilvia Donadelli, S. Y. Fung, H. Kanou, H. Gong, J. Seele, V. Bumazhnov, M. P. Comets, F. Kajihara, K. Hasuko, J. Rak, Hiroyuki Okada, Joakim Nystrand, D. J. Kim, F. Matathias, H. Masui, A. K. Dubey, E. J. Desmond, Eva Haslum, B. Lenzi, Kensuke Homma, S. Afanasiev, A. Ster, J. Newby, Charles Maguire, S. Leckey, A. A. Bickley, D. Hornback, M. Heffner, A. Taranenko, Kazushi Miki, John Hill, S. Zhou, M. Togawa, S. Chernichenko, Anne Marie Sickles, C. P. Singh, A. Deshpande, H. Lim, B. M. Johnson, Josh Moss, B. Bassalleck, A. Baldisseri, J. Park, Florian Bauer, I. Ravinovich, J. Egdemir, A. Isupov, C. Suire, P. Tarján, L. D. Isenhower, Y. S. Kim, B. Love, Y. Nagata, M. Konno, M. Gonin, J. Sziklai, G. R. Young, K. Shigaki, E. Kistenev, Y. Tsuchimoto, J. L. Charvet, François Fleuret, I. Tserruya, Yu. Efremenko, V. Singh, S. S. Ryu, Rushan Han, M. N. Hagiwara, Jason Kamin, S. P. Stoll, W. A. Zajc, V. Baublis, Brian Cole, Y. Watanabe, B. Forestier, D. E. Fields, J. T. Mitchell, Mate Csanad, I. Younus, V. S. Pantuev, T. E. Miller, R. Vértesi, H. Pereira, B. V. Jacak, H. Harada, M. Mitrovski, Y. L. Yamaguchi, A. G. Litvinenko, R. Bennett, A. Denisov, V. Cianciolo, M. Harvey, J. H. Kang, M. Wysocki, Hirohiko Sato, T. Ichihara, S. Butsyk, P. Chung, R. Seidl, Vladislav Manko, S. S.E. Rosendahl, M. Slunečka, M. McCumber, A. K. Purwar, G. Bunce, Vladimir Samsonov, I. Otterlund, Ahmed Al-Jamel, A. Soldatov, Robert F. Hobbs, S. K. Tuli, M. Finger, Junji Tojo, Matthew G. Reuter, M. Holmes, A. Kozlov, Saskia Mioduszewski, Takahiro Fusayasu, J. Chiba, Senta Greene, K. S. Sim, O. Zaudtke, Y. Kwon, M. Naglis, C. L. Silva, R. Seto, K. Haruna, I. D. Ojha, Alexander Malakhov, ShinIchi Esumi, K. Dehmelt, H. Hiejima, B. Komkov, Tamas Ferenc Csorgo, A. Churyn, D. Jouan, K. Okada, B. Sahlmueller, G. C. Mishra, H. Pei, H. En'yo, Jen-Chieh Peng, B. E. Norman, E. O'Brien, P. Constantin, O. Dietzsch, V. Dzhordzhadze, D. Silvermyr, A. Kiss, L. S. Zolin, W. J. Park, Z. Yasin, C. Vale, S. Takagi, J. L. Drachenberg, J. Jin, E. M. Takagui, T. Horaguchi, M. J. Leitch, K. Imai, Xiong Wang, J. L. Nagle, Osamu Jinnouchi, David D'Enterria, S. P. Sorensen, M. Virius, Dylan Walker, Norio Saito, E. T. Atomssa, Christine Angela Aidala, Masayasu Ishihara, Susumu Sato, J. Klay, H. Borel, Tae-Yeon Lee, Martin Purschke, T. Chujo, N. Grau, K. N. Barish, K. Shoji, P. D. Barnes, A. Yanovich, H. Valle, F. Gastineau, S. Kelly, R. S. Towell, M. A. L. Leite, I. Garishvili, Akio Kiyomichi, S. Batsouli, N. N. Ajitanand, W. S. Emam, Takao Sakaguchi, Y. Mao, J. M. Burward-Hoy, B. Chang, M. Chiu, T. A. Shibata, Debashish Pal, S. Sawada, J. Ying, A. Franz, B. Espagnon, Y. Nakamiya, F. Staley, D. Kawall, K. Das, S. Gadrat, Marcus Hohlmann, M. Grosse Perdekamp, N. Kurihara, Alexander Milov, I. Nakagawa, E. P. Hartouni, E. Stenlund, H. Sakata, C. Klein-Boesing, C. A. Ogilvie, T. K. Hemmick, K. Tanida, S. F. Pate, Julia Velkovska, Takahiro Nakamura, O. Drapier, Frank Ellinghaus, A. D. Frawley, R. Lacey, T. Tabaru, P. W. Stankus, E. R. Kinney, S. N. White, D. P. Morrison, V. I. Kochetkov, Y. Cobigo, W. C. Smith, R. Granier de Cassagnac, M. Rosati, J. G. Lajoie, Susumu Oda, M. G. Hur, C. Y. Chi, G. Baksay, T. Hachiya, A. Adare, S. Campbell, D. Kotchetkov, R. P. Pisani, V. E. Semenov, Nikolay Tyurin, P. Rosnet, J. Zimányi, H. Al-Bataineh, J. Murata, L. Kochenda, T. Shohjoh, K. Ozawa, A. Durum, Steven E. Skutnik, S. H. Aronson, S. Bathe, M. K. Lee, I. J. Choi, A. Morreale, V. Babintsev, J. E. Frantz, M. C. McCain, M. T. Bjorndal, Catherine Micaela Silvestre, A. Kravitz, D. Winter, Hiroaki Ohnishi, D. Isenhower, Y. Akiba, K. Nakano, Gerd Joachim Kunde, W. Holzmann, M. N. Wagner, I. Shein, M. Mishra, A. Toia, E. H. Kim, A. A. Vinogradov, Henrik Tydesjö, T. Kawagishi, D. S. Brown, M. L. Brooks, D. Yu Peressounko, S. Nagamiya, Kazuhiro Tanaka, Maya Hachiya Shimomura, Y. Fukao, A. Shevel, Z. Fraenkel, V. Papavassiliou, Vaclav Vrba, A. Rakotozafindrabe, W. E. Sondheim, A. P.T. Palounek, D. Lynch, H. Qu, R. Pak, L. Mašek, Y. Berdnikov, T. V. Moukhanova, Klaus Johannes Reygers, Y. I. Makdisi, A. Oskarsson, Jiangyong Jia, Y. Goto, I. Yushmanov, T. Gunji, Y. Miake, H. Buesching, P. A. Rukoyatkin, N. Kamihara, S. Fokin, J. P. Wessels, K. O. Eyser, K. Fujiwara, T. C. Awes, S. Belikov, K. S. Joo, K. Aoki, A. Glenn, G. David, R. Armendariz, Xiao-yan Li, T. Hester, Xingguo Li, V. L. Rykov, T. Dahms, Kazuyoshi Kurita, H. A. Gustafsson, M. B. Deaton, G. S. Kyle, A. Drees, M. J. Tannenbaum, N. Willis, James Alexander, H. Torii, H. W. Van Hecke, C. R. Cleven, C. Haegemann, Y. Inoue, J. Kubart, R. Soltz, Y. Tanaka, R. Averbeck, M. Inaba, C. Zhang, Byung-Sik Hong, A. Bazilevsky, T. K. Shea, P. J. Kroon, D. Mukhopadhyay, S. Rembeczki, Dong-Hun Kim, D. Bucher, A. Khanzadeev, Alexandre Lebedev, D. Sharma, D. M. Lee, L. Baksay, V-N. Tram, M. Germain, Viktor Riabov, B. Azmoun, A. Král, M. J. Kweon, Y. Le Bornec, M. Oka, A. Dion, Atsushi Taketani, A. Enokizono, T. L. Thomas, Ryugo S. Hayano, J. Gosset, J. P. Sullivan, Y. Riabov, S. Yokkaichi, J. M. Heuser, M. Nguyen, H. Delagrange, J. G. Boissevain, Masashi Kaneta, A. S. Nyanin, C. Pinkenburg, M. Stepanov, G. Roche, S. Kametani, J. S. Haggerty, A. Romana, Y. S. Lai, M. Ouchida, J. Asai, Shingo Sakai, C. L. Woody, Minghui Liu, T. Sugitate, Kenneth Francis Read, I. V. Sourikova, Tadaaki Isobe, J. S. Chai, H. Hamagaki, P. L. McGaughey, A. V. Kazantsev, L. Tomášek, P. Mikeš, T. Liška, Jun Kikuchi, L. Aphecetche, M. Issah, M. D. Malik, E. Vznuzdaev, A. Hadj Henni, K. Boyle, Wei Xie, X. He, and O. O. Omiwade

Subjects
Physics, Quantum chromodynamics, Antiparticle, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, Elementary particle, 01 natural sciences, 7. Clean energy, Nuclear physics, Internal conversion, Pair production, Antimatter, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Lepton
Abstract

The production of e(+)e(-) pairs for m(e+e-) < 0.3 GeV/c(2) and 1< p(T) < 5 GeV/c is measured in p + p and Au + Au collisions at root s(NN) = 200 GeV. An enhanced yield above hadronic sources is observed. Treating the excess as photon internal conversions, the invariant yield of direct photons is deduced. In central Au + Au collisions, the excess of the direct photon yield over p + p is exponential in transverse momentum, with an inverse slope T = 221 +/- 19(stat) +/- 19(syst) MeV. Hydrodynamical models with initial temperatures ranging from T-init similar to 300-600 MeV at times of similar to 0.6-0.15 fm/c after the collision are in qualitative agreement with the data. Lattice QCD predicts a phase transition to quark gluon plasma at similar to 170 MeV.

Published
2010
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37. Detailed measurement of thee+e−pair continuum inp+pandAu+Aucollisions atsNN=200GeV and implications for direct photon production

Author

Tae-Yeon Lee, Martin Purschke, F. Gastineau, Tadaaki Isobe, J. S. Chai, C. Silvestre, Anne Marie Sickles, Y. Fukao, A. Shevel, P. L. McGaughey, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, O. Dietzsch, E. T. Atomssa, H. Valle, Julia Velkovska, T. Hester, D. Kotchetkov, A. Kiss, Andry Malala Rakotozafindrabe, G. R. Young, Z. Yasin, Henner Buesching, D. Kawall, K. Tanida, G. S. Kyle, N. Willis, James Alexander, A. Morreale, M. Rosati, A. A. Vinogradov, Henrik Tydesjö, R. Vértesi, Jiangyong Jia, Y. Goto, T. Ichihara, M. Ouchida, R. Averbeck, J. Chiba, Z. Fraenkel, Byung-Sik Hong, J. Asai, Matthew G. Reuter, Takahiro Fusayasu, Marcus Hohlmann, Jan Rak, I. D. Ojha, Alexander Malakhov, P. Tarján, A. Bazilevsky, G. C. Mishra, X. He, Philippe Rosnet, I. Ravinovich, V-N. Tram, Charles Maguire, S. Leckey, J. Gosset, J. M. Burward-Hoy, S. Kelly, J. P. Sullivan, Minghui Liu, R. Lacey, D. Silvermyr, V. I. Kochetkov, Shingo Sakai, R. Granier de Cassagnac, Takao Sakaguchi, Alexandre Lebedev, K. O. Eyser, K. Fujiwara, O. O. Omiwade, C. Klein-Boesing, C. L. Woody, S. Belikov, K. S. Joo, C. P. Singh, R. Pak, A. Adare, Josh Moss, Y. Nagata, L. S. Zolin, N. Kamihara, D. M. Lee, Kenneth Francis Read, A. D. Frawley, B. M. Johnson, V. Peresedov, W. J. Park, T. Tabaru, Y. Nakamiya, E. Kistenev, Motoi Inaba, K. Hasuko, N. N. Ajitanand, J. Murata, R. Armendariz, A. Isupov, C. Suire, W. C. Smith, Rushan Han, M. N. Hagiwara, S. H. Aronson, Kazuyoshi Kurita, P. D. Barnes, A. Yanovich, Hiroyuki Okada, S. S. Ryu, A. V. Kazantsev, I. V. Sourikova, T. L. Thomas, J. Sziklai, M. K. Lee, S. Yokkaichi, G. Baksay, A. Drees, Brian Cole, N. Grau, H. Harada, Alexei Khanzadeev, W. Holzmann, J. M. Heuser, Joakim Nystrand, Eva Haslum, B. Lenzi, J. Kubart, Senta Greene, R. S. Towell, M. T. Bjorndal, Ryugo S. Hayano, S. Butsyk, Y. L. Yamaguchi, Gerd Joachim Kunde, H. W. Van Hecke, Y. Riabov, I. Shein, I. Garishvili, Akio Kiyomichi, L. Aphecetche, D. Sharma, M. B. Deaton, E. Stenlund, Takahiro Nakamura, H. Masui, A. K. Dubey, A. A. Bickley, Vladimir Samsonov, I. Otterlund, Maya Hachiya Shimomura, Mate Csanad, M. Gonin, Kenta Shigaki, S. N. White, H. Sakata, Y. I. Makdisi, P. Mikeš, B. Komkov, M. Nguyen, K. S. Sim, B. Azmoun, K. Shoji, B. Love, B. E. Norman, A. Král, M. J. Kweon, J. G. Boissevain, S. Afanasiev, A. S. Nyanin, N. Kurihara, Rachid Nouicer, Norio Saito, Y. Tanaka, Y. Kwon, M. A. L. Leite, K. Das, A. Ster, H. Hiejima, L. Tomášek, C. A. Ogilvie, Marie Germain, V. S. Pantuev, E. O'Brien, Masashi Kaneta, R. A. Soltz, Y. Le Bornec, J. Newby, Tamas Ferenc Csorgo, T. K. Shea, S. Bathe, E. P. Hartouni, Agneta Oskarsson, P. W. Stankus, T. K. Hemmick, A. G. Litvinenko, M. Harvey, Yasuo Miake, M. G. Hur, C. Y. Chi, Susumu Oda, J. L. Nagle, M. Oka, K. Imai, Alberto Baldisseri, A. Deshpande, Y. Berdnikov, M. Grosse Perdekamp, Y. Akiba, Junji Tojo, M. J. Tannenbaum, T. C. Awes, Kyoichiro Ozawa, T. Liška, Jun Kikuchi, M. Mishra, C. Pinkenburg, F. Matathias, S. Nagamiya, T. Shohjoh, R. Bennett, Kazuhiro Tanaka, Kensuke Homma, A. Dion, F. Staley, L. Baksay, V. Babintsev, L. Kochenda, T. V. Moukhanova, D. Hornback, A. Kozlov, Johannes Peter Wessels, Ahmed Al-Jamel, A. Durum, Vaclav Vrba, Klaus Johannes Reygers, R. Seto, K. Haruna, D. Mukhopadhyay, E. H. Kim, S. Rembeczki, Saskia Mioduszewski, M. Heffner, Atsushi Taketani, T. Kawagishi, A. Enokizono, K. Okada, H. Pereira, B. Sahlmueller, S. Chernichenko, M. Stepanov, G. Roche, E. J. Desmond, M. Finger, Y. J. Mao, S. Kametani, K. Nakano, H. Lim, A. Taranenko, H. En'yo, David D'Enterria, A. Hadj Henni, V. Dzhordzhadze, J. Egdemir, P. Constantin, D. Bucher, M. J. Leitch, B. Bassalleck, M. Togawa, S. Takagi, J. H. Kang, J. S. Haggerty, D. S. Brown, Kazushi Miki, Y. Watanabe, Jason Kamin, J. Jin, J. Park, E. M. Takagui, S. P. Stoll, Xiao-yan Li, J. E. Frantz, M. Konno, D. Winter, D. Yu Peressounko, Florian Bauer, K. Boyle, K. N. Barish, A. Romana, W. E. Sondheim, S. S.E. Rosendahl, G. Bunce, I. Younus, Wei Xie, J. T. Mitchell, C. R. Cleven, R. P. Pisani, Y. Tsuchimoto, A. Churyn, R. Seidl, I. E. Yushmanov, Herve Borel, D. Lynch, Vladislav Manko, A. Soldatov, C. Haegemann, Y. Inoue, M. Slunečka, D. Jouan, M. L. Brooks, Y. S. Lai, A. Glenn, P. A. Rukoyatkin, V. L. Rykov, T. Dahms, M. Naglis, D. E. Fields, C. L. Silva, Nikolay Tyurin, P. J. Kroon, B. V. Jacak, M. N. Wagner, C. Vale, B. S. Chang, Dong-Hun Kim, Christine Angela Aidala, S. Y. Fung, Masayasu Ishihara, J. Klay, J. L. Drachenberg, M. Issah, Susumu Sato, M. D. Malik, E. Vznuzdaev, O. Zaudtke, M. Virius, M. McCumber, A. K. Purwar, S. P. Sorensen, Steven E. Skutnik, Y. Cobigo, John Hill, Dylan Walker, H. A. Torii, H. Qu, Toru Sugitate, S. Esumi, W. A. Zajc, Hideki Hamagaki, K. Aoki, L. D. Isenhower, V. Baublis, J. G. Lajoie, A. Denisov, T. Hachiya, G. David, I. J. Choi, A. Kravitz, Hiroaki Ohnishi, V. Cianciolo, Sergey Fokin, T. Horaguchi, S. Batsouli, M. C. McCain, A. P.T. Palounek, Xingguo Li, François Fleuret, B. Forestier, H. A. Gustafsson, C. Zhang, Viktor Riabov, I. Tserruya, Yu. Efremenko, V. Singh, Hirohiko Sato, S. K. Tuli, Alexander Milov, I. Nakagawa, O. Drapier, Frank Ellinghaus, E. R. Kinney, D. P. Morrison, S. Campbell, V. E. Semenov, J. Zimányi, Tatsuya Chujo, K. Dehmelt, Jen-Chieh Peng, Xiong Wang, Dong Jo Kim, Osamu Jinnouchi, S. F. Pate, H. Al-Bataineh, H. Kanou, V. Papavassiliou, Taku Gunji, H. Gong, J. Seele, Sébastien Gadrat, Robert F. Hobbs, F. Kajihara, H. Delagrange, Debashish Pal, S. Sawada, J. Ying, A. Franz, B. Espagnon, M. Mitrovski, S. Zhou, M. Wysocki, Y. S. Kim, M. Chiu, T. A. Shibata, D. Isenhower, A. Toia, L. Mašek, J. L. Charvet, T. E. Miller, P. Chung, M. Holmes, W. S. Emam, and H. Pei

Subjects
Physics, Nuclear and High Energy Physics, Antiparticle, Meson, 010308 nuclear & particles physics, Hadron, Elementary particle, Quarkonium, 01 natural sciences, Nuclear physics, Antimatter, 0103 physical sciences, Mass spectrum, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics, Lepton
Abstract

PHENIX has measured the e(+)e(-) pair continuum in root s(NN) = 200 GeV Au+Au and p+p collisions over a wide range of mass and transverse momenta. The e(+)e(-) yield is compared to the expectations from hadronic sources, based on PHENIX measurements. In the intermediate-mass region, between the masses of the phi and the J/psi meson, the yield is consistent with expectations from correlated c (c) over bar production, although other mechanisms are not ruled out. In the low-mass region, below the phi, the p+p inclusive mass spectrum is well described by known contributions from light meson decays. In contrast, the Au+Au minimum bias inclusive mass spectrum in this region shows an enhancement by a factor of 4.7 +/- 0.4(stat) +/- 1.5(syst) +/- 0.9(model). At low mass (m(ee) < 0.3 GeV/c(2)) and high p(T) (1 < p(T) < 5 GeV/c) an enhanced e(+)e(-) pair yield is observed that is consistent with production of virtual direct photons. This excess is used to infer the yield of real direct photons. In central Au+Au collisions, the excess of the direct photon yield over the p+p is exponential in p(T), with inverse slope T = 221 +/- 19(stat) +/- 19(syst) MeV. Hydrodynamical models with initial temperatures ranging from T-init similar or equal to 300-600 MeV at times of 0.6-0.15 fm/c after the collision are in qualitative agreement with the direct photon data in Au+Au. For low p(T) < 1 GeV/c the low-mass region shows a further significant enhancement that increases with centrality and has an inverse slope of T similar or equal to 100 MeV. Theoretical models underpredict the low-mass, low-p(T) enhancement.

Published
2010
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38. Double-helicity dependence of jet properties from dihadrons in longitudinally polarizedp+pcollisions ats=200 GeV

Author

J. Chiba, Y. Ikeda, J. G. Boissevain, E. J. Mannel, Masashi Kaneta, David D'Enterria, Takao Sakaguchi, C. Klein-Boesing, B. Azmoun, M. B. Deaton, A. Král, M. J. Kweon, C. Pinkenburg, A. D. Frawley, T. Tabaru, A. Kiss, I. Tserruya, Tadaaki Isobe, D. E. Fields, Y. Onuki, Y. Tanaka, Yu. Efremenko, S. Huang, Jan Rak, M. Stepanov, R. Lacey, G. Roche, S. P. Sorensen, Robert F. Hobbs, V. Singh, R. Granier de Cassagnac, S. H. Aronson, A. Adare, M. N. Wagner, Z. Yasin, P. L. McGaughey, B. V. Jacak, W. Holzmann, M. Oka, Dylan Walker, M. Chiu, Henner Buesching, K. A. Drees, Y. J. Mao, A. Dion, K. S. Sim, Y. Nakamiya, V. Dzhordzhadze, S. Kametani, T. Horaguchi, Y. Kwon, R. Yang, H. Hiejima, M. McCumber, Anne Marie Sickles, K. Imai, Seong H. Kim, M. Ouchida, N. Means, J. Asai, Debashish Pal, S. Sawada, J. H. Kang, J. S. Haggerty, G. R. Young, Marcus Hohlmann, F. Staley, L. Baksay, J. G. Lajoie, G. Baksay, A. Romana, Atsushi Taketani, A. Enokizono, P. Liebing, T. Hachiya, J. Ying, A. Franz, A. V. Kazantsev, C. R. Cleven, Ajit Kumar Mohanty, C. Haegemann, Y. Inoue, T. A. Shibata, Alexander Milov, I. Nakagawa, Maya Hachiya Shimomura, Y. I. Makdisi, Shingo Sakai, T. Engelmore, T. Sato, R. A. Soltz, Y. Fukao, Tae-Yeon Lee, A. Shevel, Martin Purschke, C. M. Camacho, Prashant Shukla, L. Tomášek, P. Mikeš, R. Pak, W. A. Zajc, C. Silvestre, T. Hester, T. Kempel, Dong-Hun Kim, O. Drapier, Frank Ellinghaus, E. R. Kinney, I. J. Choi, D. P. Morrison, S. Campbell, A. Kravitz, H. Pei, S. F. Pate, R. Vértesi, N. Kamihara, Marisilvia Donadelli, D. Isenhower, A. Toia, V. E. Semenov, D. Kotchetkov, J. Zimányi, V. Baublis, R. Armendariz, O. Dietzsch, A. Denisov, E. T. Atomssa, H. Valle, Y. S. Lai, V. Bumazhnov, M. P. Comets, Tatsuya Chujo, V. Cianciolo, M. J. Tannenbaum, T. C. Awes, Kyoichiro Ozawa, T. Liška, X. He, O. O. Omiwade, H. Al-Bataineh, Hiroaki Ohnishi, K. B. Lee, A. Yu. Semenov, L. Mašek, A. Morreale, M. Grosse Perdekamp, Andry Malala Rakotozafindrabe, L. Aphecetche, K. O. Eyser, A. K. Purwar, K. Fujiwara, H. Torii, C. L. Woody, A. Berdnikov, J. Gosset, J. T. Mitchell, Y. Tomita, Jun Kikuchi, Kazuyoshi Kurita, A. Drees, V-N. Tram, N. Grau, Dipanwita Dutta, N. N. Ajitanand, T. Niita, D. Mukhopadhyay, Sergey Fokin, S. Rembeczki, K. Dehmelt, R. Tanabe, D. Layton, Z. Fraenkel, Jen-Chieh Peng, R. Seidl, Vladislav Manko, K. Das, Minghui Liu, J. L. Charvet, J. Kubart, J. E. Frantz, V. Papavassiliou, K. Sakashita, Motoi Inaba, V. Peresedov, Julia Velkovska, Sébastien Gadrat, Takahiro Nakamura, M. Slunečka, H. Liu, M. K. Lee, R. K. Choudhury, Xiong Wang, Eva Haslum, Dong Jo Kim, E. P. Hartouni, B. Lenzi, Kenneth Francis Read, T. E. Miller, M. Kurosawa, J. Egdemir, W. C. Chang, Osamu Jinnouchi, Jason Kamin, E. J. Desmond, D. Roach, S. Yokkaichi, K. M. Kijima, S. Belikov, K. Shoji, M. Mitrovski, Susumu Oda, B. Meredith, H. W. Van Hecke, A. Durum, J. Koster, I. V. Sourikova, Charles Maguire, S. Afanasiev, A. Ster, T. L. Thomas, A. Veicht, S. P. Stoll, M. Rosati, Rushan Han, P. Chung, J. Imrek, M. Togawa, J. Park, V. S. Pantuev, S. Butsyk, Vladimir Samsonov, J. Newby, H. A. Gustafsson, M. Wysocki, S. Bathe, Johannes Peter Wessels, Agneta Oskarsson, Ryugo S. Hayano, S. S.E. Rosendahl, G. Bunce, K. Yamaura, E. Kistenev, Xingguo Li, M. Gonin, W. S. Emam, S. Batsouli, H. Kanou, Y. Tsuchimoto, Y. Riabov, Y. Berdnikov, Y. Akiba, P. W. Stankus, M. Mishra, D. Hornback, A. Churyn, Kenta Shigaki, H. Masui, A. K. Dubey, Taku Gunji, H. Gong, J. Seele, M. Nguyen, M. Heffner, D. Jouan, A. A. Vinogradov, C. Zhang, C. Vale, I. E. Yushmanov, Junji Tojo, F. Kajihara, S. Nagamiya, A. Hadj Henni, Alexei Khanzadeev, Tamas Ferenc Csorgo, H. Harada, J. L. Nagle, Vaclav Vrba, Klaus Johannes Reygers, A. S. Nyanin, A. Taranenko, E. Stenlund, B. S. Chang, Kazushi Miki, Rachid Nouicer, H. Delagrange, Jiangyong Jia, Y. Goto, D. Winter, H. Sakata, D. Yu Peressounko, A. A. Bickley, P. Tarján, A. Sukhanov, K. Okada, H. Pereira, Y. Morino, Christine Angela Aidala, J. Klay, Brajesh K. Singh, C. A. Ogilvie, P. Ružička, T. K. Hemmick, B. Sahlmueller, John Hill, H. En'yo, M. J. Leitch, Beomkyu Kim, K. Boyle, S. Zhou, Yasuo Miake, B. Love, Wei Xie, Steven E. Skutnik, T. V. Moukhanova, S. D. Rolnick, L. Kochenda, Viktor Riabov, A. G. Litvinenko, F. Matathias, Toru Sugitate, L. D. Isenhower, Senta Greene, M. I. Nagy, M. Issah, M. D. Malik, E. Vznuzdaev, A. Kozlov, R. Seto, K. Haruna, A. T. Basye, Kensuke Homma, B. E. Norman, B. Fadem, H. Qu, S. Takagi, E. O'Brien, K. N. Barish, P. Constantin, S. Chernichenko, Hideki Hamagaki, K. Aoki, M. L. Brooks, G. David, François Fleuret, B. Bassalleck, H. Iinuma, T. Ichihara, M. Konno, Matthew G. Reuter, Takahiro Fusayasu, A. P.T. Palounek, Alexander Malakhov, D. Silvermyr, L. S. Zolin, W. J. Park, P. D. Barnes, A. Yanovich, S. N. White, Zvi Hirsh Citron, K. Nakano, W. E. Sondheim, D. Ivanischev, P. A. Rukoyatkin, E. H. Kim, I. Ravinovich, Y. Nagata, Y. L. Yamaguchi, M. Bai, B. Komkov, E. C. Aschenauer, Norio Saito, M. A. L. Leite, R. Bennett, J. S. Kapustinsky, M. Finger, S. Dairaku, V. Babintsev, O. Zaudtke, G. S. Kyle, James Alexander, M. Virius, R. Averbeck, Byung-Sik Hong, A. Bazilevsky, Philippe Rosnet, A. Glenn, Alexandre Lebedev, D. M. Lee, Herve Borel, D. Lynch, K. Kiriluk, V. L. Rykov, T. Dahms, K. S. Joo, S. Esumi, D. Sharma, Saskia Mioduszewski, R. Ichimiya, J. Jin, E. M. Takagui, C. Baumann, M. Naglis, C. P. Singh, C. L. Silva, B. M. Johnson, A. Isupov, C. Suire, Masayasu Ishihara, J. Sziklai, Susumu Sato, Brian Cole, R. S. Towell, I. Garishvili, Akio Kiyomichi, F. Wei, A. Deshpande, N. Kurihara, C. Y. Chi, Y. Watanabe, I. Younus, A. Soldatov, D. Kawall, K. Tanida, H. Themann, V. I. Kochetkov, J. Murata, Gerd Joachim Kunde, I. Shein, K. Sedgwick, Alberto Baldisseri, and Mate Csanad

Subjects
Physics, Nuclear and High Energy Physics, Angular momentum, Particle physics, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Drell–Yan process, 01 natural sciences, Helicity, Baryon, Nuclear physics, Total angular momentum quantum number, 0103 physical sciences, Proton spin crisis, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Nucleon, Spin (physics)
Abstract

It has been postulated that partonic orbital angular momentum can lead to a significant double-helicity dependence in the net transverse momentum of Drell-Yan dileptons produced in longitudinally polarized p + p collisions. Analogous effects are also expected for dijet production. If confirmed by experiment, this hypothesis, which is based on semiclassical arguments, could lead to a new approach for studying the contributions of orbital angular momentum to the proton spin. We report the first measurement of the double-helicity dependence of the dijet transverse momentum in longitudinally polarized p + p collisions at root s = 200 GeV from data taken by the PHENIX experiment in 2005 and 2006. The analysis deduces the transverse momentum of the dijet from the widths of the near-and far-side peaks in the azimuthal correlation of the dihadrons. When averaged over the transverse momentum of the triggered particle, the difference of the root mean square of the dijet transverse momentum between like-and unlike-helicity collisions is found to be -37 +/- 88(stat) +/- 14(sys)t MeV/c.

Published
2010
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39. Construction and Beam Commissioning of J-PARC Hadron Experimental Facility

Author

Yoshinori Sato, Keizo Agari, Erina Hirose, Masaharu Ieiri, Yohji Katoh, Akio Kiyomichi, Michifumi Minakawa, Ryotaro Muto, Megumi Naruki, Hiroyuki Noumi, Shin’ya Sawada, Yoshihisa Shirakabe, Yoshihiro Suzuki, Hitoshi Takahashi, Minoru Takasaki, Kazuhiro Tanaka, Akihisa Toyoda, Yutaka Yamanoi, Hiroaki Watanabe, Akira Ozawa, and Weiping Lu

Subjects
Physics, Particle physics, Proton, Nuclear Theory, Beam commissioning, Hadron, Proton Synchrotron, Nuclear physics, Pion, Physics::Accelerator Physics, High Energy Physics::Experiment, J-PARC, Nuclear Experiment, Beam (structure)
Abstract

J‐PARC Hadron Experimental Facility is designed as a multi‐purpose experimental facility for particle and nuclear physics experiments using high‐intensity secondary particles (Kaons, pions, and so on) produced by 50 GeV‐15 μA (750 kW) primary proton beams. Currently, three secondary beam lines (K 1.8 BR, K 1.8, and KL) have been constructed. The first beam extraction from 50 GeV proton synchrotron was on January 27th, 2009, and the beam commissioning of the primary and secondary beam lines are on going. The present article reports construction status and beam commissioning of Hadron Experimental Facility in detail.

Published
2010
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40. High-pT π0production with respect to the reaction plane inAu+Aucollisions atsNN=200GeV

Author

Youngil Kwon, J. Egdemir, Taku Gunji, F. Kajihara, Tadaaki Isobe, J. S. Chai, S. P. Stoll, H. Delagrange, E. J. Desmond, K. Hasuko, S. S.E. Rosendahl, D. E. Fields, G. Bunce, K. Das, P. L. McGaughey, Hiroyuki Okada, E. P. Hartouni, B. V. Jacak, Y. S. Kim, Joakim Nystrand, M. Togawa, Eva Haslum, J. Park, Florian Bauer, C. A. Ogilvie, T. K. Hemmick, Yasuo Miake, L. Kochenda, A. K. Purwar, D. Jouan, T. Kawagishi, G. S. Kyle, A. V. Kazantsev, M. Chiu, T. A. Shibata, N. Willis, James Alexander, C. R. Cleven, R. Averbeck, Byung-Sik Hong, T. Ichihara, Matthew G. Reuter, N. Kamihara, S. Butsyk, Vladimir Samsonov, A. Bazilevsky, S. Afanasiev, F. Matathias, A. Ster, R. Armendariz, S. Takagi, Kazuyoshi Kurita, A. Drees, Philippe Rosnet, I. D. Ojha, D. Isenhower, Alexander Malakhov, P. J. Kroon, J. Newby, V-N. Tram, Alexandre Lebedev, V. S. Pantuev, L. Aphecetche, K. N. Barish, P. Tarján, T. L. Thomas, D. Silvermyr, M. Gonin, L. S. Zolin, Y. Tsuchimoto, S. Kelly, D. M. Lee, Yoichiro Fukao, N. N. Ajitanand, S. Kametani, W. J. Park, Kensuke Homma, M. Rosati, M. Heffner, Ryugo S. Hayano, Tamas Ferenc Csorgo, M. Harvey, T. C. Awes, Kyoichiro Ozawa, Junji Tojo, Motoi Inaba, S. Esumi, J. L. Nagle, Takahiro Nakamura, J. H. Kang, T. E. Miller, A. Taranenko, A. Enokizono, Jen-Chieh Peng, P. D. Barnes, A. Yanovich, N. Grau, K. Shoji, E. H. Kim, Y. Riabov, Kenta Shigaki, I. E. Yushmanov, Maya Hachiya Shimomura, Johannes Peter Wessels, J. S. Haggerty, A. Romana, W. A. Zajc, M. Wysocki, M. Holmes, T. Shohjoh, A. Durum, H. Pereira, S. Y. Fung, M. Nguyen, R. Vértesi, M. L. Brooks, A. S. Nyanin, K. Okada, K. S. Sim, Y. Watanabe, A. Hadj Henni, S. Chernichenko, H. Lim, V. Baublis, John Hill, P. W. Stankus, H. W. Van Hecke, A. Denisov, V. Cianciolo, J. E. Frantz, B. Bassalleck, A. A. Vinogradov, Henrik Tydesjö, D. S. Brown, Minghui Liu, Robert F. Hobbs, B. Sahlmueller, Y. I. Makdisi, Dong Jo Kim, V. Bumazhnov, M. P. Comets, K. Boyle, Sergey Fokin, Anders Nils Erik Oskarsson, H. En'yo, P. Constantin, M. Konno, H. A. Torii, Osamu Jinnouchi, Wei Xie, Marie Germain, Jiangyong Jia, Y. Goto, M. J. Leitch, Toru Sugitate, A. Kiss, Kenneth Francis Read, L. D. Isenhower, T. Horaguchi, Henner Buesching, Senta Greene, A. G. Litvinenko, J. L. Drachenberg, H. Hiejima, B. Komkov, Steven E. Skutnik, Hans-Åke Gustafsson, Martin Purschke, J. M. Burward-Hoy, Debashish Pal, J. Gosset, B. E. Norman, Norio Saito, J. P. Sullivan, S. Sawada, E. O'Brien, Alexander Milov, M. A. L. Leite, A. Franz, R. A. Soltz, A. Kozlov, F. Gastineau, Shingo Sakai, K. Imai, H. Qu, M. N. Hagiwara, Herve Borel, R. Seto, K. Haruna, W. C. Smith, S. Bathe, C. L. Woody, S. P. Sorensen, François Fleuret, M. Issah, O. Drapier, Hideki Hamagaki, K. Aoki, G. David, M. Grosse Perdekamp, M. J. Tannenbaum, B. Forestier, Y. Berdnikov, V. Babintsev, M. D. Malik, B. Espagnon, Y. Akiba, S. Yokkaichi, V. Dzhordzhadze, M. T. Bjorndal, A. Glenn, J. M. Heuser, S. Nagamiya, Kazuhiro Tanaka, E. Vznuzdaev, X. He, E. R. Kinney, Klaus Johannes Reygers, D. P. Morrison, O. O. Omiwade, M. K. Lee, Anne Marie Sickles, S. N. White, S. Campbell, S. F. Pate, O. Dietzsch, V. Peresedov, J. G. Boissevain, Masashi Kaneta, V. L. Rykov, T. Dahms, I. V. Sourikova, H. Valle, C. Zhang, V. E. Semenov, D. Winter, D. Yu Peressounko, Alexei Khanzadeev, Julia Velkovska, X. R. Wang, D. Mukhopadhyay, G. R. Young, J. Zimányi, C. Pinkenburg, J. T. Mitchell, H. Masui, A. K. Dubey, J. G. Lajoie, W. E. Sondheim, D. Kotchetkov, Tatsuya Chujo, T. Hachiya, O. Zaudtke, D. Bucher, P. A. Rukoyatkin, E. Stenlund, Vladislav Manko, I. Tserruya, M. Stepanov, G. Roche, Yu. Efremenko, Jan Rak, R. Lacey, Ingvar Otterlund, R. Granier de Cassagnac, J. Chiba, V. Papavassiliou, Sébastien Gadrat, V. Singh, I. J. Choi, Hiroaki Ohnishi, C. Vale, Viktor Riabov, Christine Angela Aidala, G. C. Mishra, Z. Fraenkel, Takao Sakaguchi, C. Klein-Boesing, Y. Cobigo, I. Ravinovich, A. D. Frawley, T. Tabaru, Y. Nagata, S. Batsouli, S. H. Aronson, W. Holzmann, S. S. Ryu, T. V. Moukhanova, R. Bennett, Hirohiko Sato, S. K. Tuli, Ahmed Al-Jamel, Xingguo Li, B. Azmoun, M. J. Kweon, M. C. McCain, A. P.T. Palounek, Y. Le Bornec, A. Dion, Atsushi Taketani, S. Belikov, K. S. Joo, H. Pei, D. Sharma, Mate Csanad, David D'Enterria, R. P. Pisani, Nikolay Tyurin, M. N. Wagner, Saskia Mioduszewski, J. Jin, E. M. Takagui, C. P. Singh, B. M. Johnson, A. Isupov, C. Suire, J. Sziklai, Brian Cole, Charles Maguire, S. Leckey, R. S. Towell, Josh Moss, Akio Kiyomichi, E. Kistenev, H. Harada, N. Kurihara, M. G. Hur, C. Y. Chi, Y. Tanaka, T. K. Shea, M. Naglis, C. L. Silva, Masayasu Ishihara, F. Staley, Susumu Sato, A. Deshpande, I. Younus, A. Soldatov, K. Tanida, V. I. Kochetkov, J. Murata, Gerd Joachim Kunde, I. Shein, and Alberto Baldisseri

Subjects
Physics, Nuclear and High Energy Physics, Meson, 010308 nuclear & particles physics, Plane (geometry), Elliptic flow, Parton, 01 natural sciences, Azimuth, Nuclear physics, Pion, 0103 physical sciences, Atomic physics, Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider, Jet quenching
Abstract

Measurements of the azimuthal anisotropy of high-p(T) neutral pion (pi(0)) production in Au+Au collisions at s(NN)=200 GeV by the PHENIX experiment are presented. The data included in this article were collected during the 2004 Relativistic Heavy Ion Collider running period and represent approximately an order of magnitude increase in the number of analyzed events relative to previously published results. Azimuthal angle distributions of pi(0) mesons detected in the PHENIX electromagnetic calorimeters are measured relative to the reaction plane determined event-by-event using the forward and backward beam-beam counters. Amplitudes of the second Fourier component (v(2)) of the angular distributions are presented as a function of pi(0) transverse momentum (p(T)) for different bins in collision centrality. Measured reaction plane dependent pi(0) yields are used to determine the azimuthal dependence of the pi(0) suppression as a function of p(T), R-AA(Delta phi,p(T)). A jet-quenching motivated geometric analysis is presented that attempts to simultaneously describe the centrality dependence and reaction plane angle dependence of the pi(0) suppression in terms of the path lengths of hypothetical parent partons in the medium. This set of results allows for a detailed examination of the influence of geometry in the collision region and of the interplay between collective flow and jet-quenching effects along the azimuthal axis.

Published
2009
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41. Systematic studies of elliptic flow measurements inAu+Aucollisions atsNN=200GeV

Author

S. Bathe, Maya Hachiya Shimomura, H. Pei, Y. Berdnikov, Y. I. Makdisi, T. L. Thomas, Y. Akiba, S. Nagamiya, Kazuhiro Tanaka, Ryugo S. Hayano, Klaus Johannes Reygers, M. J. Tannenbaum, J. Egdemir, Y. Riabov, Kenta Shigaki, J. T. Mitchell, M. Nguyen, S. Afanasiev, A. Ster, D. Mukhopadhyay, A. S. Nyanin, Rachid Nouicer, E. J. Desmond, S. P. Stoll, S. Esumi, J. Newby, G. Roche, D. Bucher, Minghui Liu, W. A. Zajc, P. Tarján, Sean A. Kelly, V. Baublis, A. Denisov, M. Togawa, V. Cianciolo, S. Batsouli, Vladislav Manko, M. C. McCain, A. P.T. Palounek, Sergey Fokin, Kenneth Francis Read, J. Park, Florian Bauer, T. Horaguchi, J. Chiba, Alice Mignerey, S. S.E. Rosendahl, G. Bunce, O. Zaudtke, H. Masui, Charles Maguire, S. Leckey, G. C. Mishra, C. L. Woody, A. V. Kazantsev, Hiroaki Ohnishi, Y. Tsuchimoto, C. Zhang, A. Lebedev, X. He, M. Heffner, P. Rosnet, Takao Sakaguchi, M. Wagner, C. Klein-Boesing, Viktor Riabov, I. E. Yushmanov, Steven E. Skutnik, Alexei Khanzadeev, Mate Csanad, D. Jouan, Y. Cobigo, A. Taranenko, Josh Moss, S. Belikov, K. S. Joo, Senta Greene, A. D. Frawley, T. Tabaru, S. H. Aronson, M. Chiu, T. A. Shibata, E. Kistenev, S. Kametani, V. S. Pantuev, I. V. Sourikova, H. Okada, C. Vale, Yoichiro Fukao, H. W. Van Hecke, R. Pak, S. Takagi, K. Das, H. Qu, W. Holzmann, C. P. Singh, T. C. Awes, B. E. Norman, D. E. Fields, N. Kamihara, M. Harvey, B. M. Johnson, Junji Tojo, I. Ravinovich, H. Harada, Christine Angela Aidala, J. S. Haggerty, A. Kiss, Y. Nagata, Kyoichiro Ozawa, A. Hadj Henni, E. O'Brien, B. V. Jacak, E. H. Kim, Hideki Hamagaki, K. Aoki, G. David, F. Matathias, R. Armendariz, Henner Buesching, E. P. Hartouni, D. Isenhower, K. Okada, K. N. Barish, A. Isupov, D. Sharma, S. S. Ryu, R. A. Soltz, Kazuyoshi Kurita, A. Romana, B. Sahlmueller, S. Gadrat, T. V. Moukhanova, K. Hasuko, David D'Enterria, A. Drees, A. K. Purwar, H. En'yo, P. Constantin, J. Sziklai, M. J. Leitch, M. Wysocki, Tadaaki Isobe, R. Bennett, B. Azmoun, M. J. Kweon, Ahmed Al-Jamel, S. Sakai, M. Grosse Perdekamp, R. Vértesi, V. N. Tram, Evert Stenlund, K. Boyle, C. R. Cleven, J. S. Chai, J. M. Burward-Hoy, J. E. Frantz, R. S. Towell, Xingguo Li, Y. Le Bornec, Y. Tanaka, Akio Kiyomichi, R. P. Pisani, Joakim Nystrand, Taku Gunji, Y. J. Kwon, P. L. McGaughey, Herve Borel, Eva Haslum, W. C. Smith, F. Kajihara, T. K. Shea, M. Gonin, P. J. Kroon, Kensuke Homma, A. Glenn, S. Sorensen, S. F. Pate, C. A. Ogilvie, T. K. Hemmick, N. N. Ajitanand, V. L. Rykov, T. Dahms, N. Kurihara, H. Delagrange, M. K. Lee, Nikolay Tyurin, A. Dion, W. Xie, S. Chernichenko, Atsushi Taketani, Yasuo Miake, H. Lim, F. Staley, H. Pereira, B. Bassalleck, O. Dietzsch, Takahiro Nakamura, M. L. Brooks, N. Grau, Martin Purschke, L. Kochenda, J. G. Boissevain, K. Shoji, M. G. Hur, C. Y. Chi, M. Konno, F. Gastineau, B. Komkov, T. Shohjoh, D. Winter, D. Yu Peressounko, V. Papavassiliou, O. O. Omiwade, Robert F. Hobbs, Y. S. Kim, T. Kawagishi, Masashi Kaneta, A. Durum, M. Issah, P. W. Stankus, D. Kotchetkov, H. Valle, J. L. Drachenberg, Hans-Åke Gustafsson, D. S. Brown, Norio Saito, V. Peresedov, M. D. Malik, E. Vznuzdaev, Z. Fraenkel, T. E. Miller, Debashish Pal, S. Sawada, A. Enokizono, Saskia Mioduszewski, M. A. L. Leite, X. R. Wang, B. Forestier, M. T. Bjorndal, A. Franz, Julia Velkovska, M. Holmes, M. Rosati, C. Pinkenburg, L. Aphecetche, J. H. Kang, J. Jin, J. G. Lajoie, T. Hachiya, E. M. Takagui, Johannes Peter Wessels, V. Babintsev, Ingvar Otterlund, I. J. Choi, G. S. Kyle, Bruno Espagnon, A. K. Dubey, A. A. Vinogradov, Henrik Tydesjö, N. Willis, James Alexander, M. Stepanov, R. Averbeck, Byung-Sik Hong, A. Bazilevsky, Motoi Inaba, Anders Oskarsson, D. M. Lee, Jiangyong Jia, Y. Goto, J. Gosset, J. P. Sullivan, Marie Germain, A. G. Litvinenko, S. Yokkaichi, J. M. Heuser, A. Kozlov, R. Seto, K. Haruna, B. A. Cole, V. Dzhordzhadze, V. Bumazhnov, M. P. Comets, M. N. Hagiwara, S. Butsyk, Vladimir Samsonov, Tamas Ferenc Csorgo, J. L. Nagle, I. Tserruya, Yu. Efremenko, V. Singh, Hirohiko Sato, S. K. Tuli, Christophe Pierre Suire, Alexander Milov, O. Drapier, E. R. Kinney, D. P. Morrison, S. Campbell, V. E. Semenov, J. Zimányi, Tatsuya Chujo, M. Naglis, Jen-Chieh Peng, C. L. Silva, Dong Jo Kim, Osamu Jinnouchi, Masayasu Ishihara, Susumu Sato, A. Deshpande, Y. Watanabe, I. Younus, A. Soldatov, K. Tanida, V. I. Kochetkov, D. Silvermyr, J. Murata, Gerd Joachim Kunde, I. Shein, Alberto Baldisseri, Anne Marie Sickles, G. R. Young, K. S. Sim, H. Hiejima, K. Imai, Jan Rak, R. Lacey, R. Granier de Cassagnac, S. N. White, W. E. Sondheim, P. A. Rukoyatkin, S. Y. Fung, John Hill, H. A. Torii, Toru Sugitate, L. D. Isenhower, François Fleuret, T. Ichihara, Matthew G. Reuter, I. D. Ojha, Alexander Malakhov, L. S. Zolin, W. J. Park, P. D. Barnes, and A. Yanovich

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Elliptic flow, Hadron, 01 natural sciences, Charged particle, Color-glass condensate, Nuclear physics, Pseudorapidity, 0103 physical sciences, Quark–gluon plasma, Transverse momentum, Anisotropic flow, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics
Abstract

We present inclusive charged hadron elliptic flow (v(2)) measured over the pseudorapidity range vertical bar eta vertical bar 6.5) pseudorapidities and (2) the two-particle cumulant method extracted using correlations between particles detected at midrapidity. The two event-plane results are consistent within systematic uncertainties over the measured p(T) and in centrality 0-40%. There is at most a 20% difference in the v(2) between the two event-plane methods in peripheral (40-60%) collisions. The comparisons between the two-particle cumulant results and the standard event-plane measurements are discussed.

Published
2009
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42. Measurement of Bottom Versus Charm as a Function of Transverse Momentum with Electron-Hadron Correlations inp+pCollisions ats=200 GeV

Author

A. Deshpande, C. L. Woody, P. Tarján, A. Berdnikov, D. E. Fields, E. Kistenev, H. Harada, S. Dairaku, A. Yu. Semenov, B. V. Jacak, J. Gosset, Y. Watanabe, M. B. Deaton, H. Pei, Y. Tanaka, O. Zaudtke, M. McCumber, Mate Csanad, F. Staley, L. Baksay, Ajit Kumar Mohanty, C. Silvestre, I. Younus, Tae-Yeon Lee, A. Soldatov, T. A. Shibata, T. Sato, L. Tomáek, I. V. Sourikova, Senta Greene, S. Yokkaichi, Martin Purschke, M. K. Lee, M. Virius, Y. Nakamiya, G. Baksay, K. S. Sim, V. Dzhordzhadze, Y. Kwon, Saskia Mioduszewski, C. A. Ogilvie, D. Isenhower, A. Toia, D. Kotchetkov, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Andry Malala Rakotozafindrabe, E. H. Kim, R. Yang, A. T. Basye, David D'Enterria, H. Hiejima, T. K. Hemmick, M. Naglis, A. Morreale, Yasuo Miake, B. E. Norman, C. L. Silva, C. R. Cleven, C. Haegemann, Y. Inoue, B. Fadem, E. O'Brien, R. A. Soltz, M. N. Wagner, M. Rosati, Y. Fukao, N. N. Ajitanand, Y. Ikeda, A. Shevel, Z. Fraenkel, J. G. Boissevain, E. J. Mannel, T. Niita, Masashi Kaneta, T. Hester, K. A. Drees, A. Glenn, R. Tanabe, D. Layton, K. Imai, Masayasu Ishihara, M. Grosse Perdekamp, M. Ouchida, T. Kempel, Dong-Hun Kim, Susumu Sato, R. K. Choudhury, L. Kochenda, C. Pinkenburg, Y. Onuki, N. Means, J. Jin, B. Azmoun, E. M. Takagui, Takahiro Nakamura, J. L. Charvet, D. Kawall, A. Král, M. J. Kweon, J. Asai, K. Tanida, H. Themann, W. C. Chang, M. Stepanov, G. Roche, Steven E. Skutnik, C. Baumann, Y. J. Mao, A. A. Vinogradov, Jan Rak, S. Kametani, T. Horaguchi, V-N. Tram, C. P. Singh, V. I. Kochetkov, N. Grau, G. S. Kyle, B. M. Johnson, Susumu Oda, J. Murata, Herve Borel, D. Lynch, F. Matathias, James Alexander, J. H. Kang, J. S. Haggerty, A. Romana, Kensuke Homma, R. Lacey, R. Granier de Cassagnac, A. Adare, T. E. Miller, M. Kurosawa, A. Isupov, C. Suire, A. Durum, Motoi Inaba, Jiangyong Jia, Y. Goto, R. Averbeck, Byung-Sik Hong, R. Pak, L. Maek, H. Qu, J. Sziklai, Gerd Joachim Kunde, A. Bazilevsky, I. Shein, Shingo Sakai, Rushan Han, T. L. Thomas, Robert F. Hobbs, D. Winter, N. Kamihara, P. Chung, K. Yamaura, Philippe Rosnet, K. O. Eyser, A. K. Purwar, K. Fujiwara, K. Sedgwick, D. Yu Peressounko, P. Constantin, P. Mike, V. L. Rykov, T. Dahms, J. Imrek, K. Das, S. Butsyk, S. Chernichenko, Brian Cole, R. S. Towell, Hideki Hamagaki, K. Aoki, Alberto Baldisseri, Alexandre Lebedev, Vladimir Samsonov, G. David, M. Oka, D. M. Lee, Y. S. Lai, R. Armendariz, E. P. Hartouni, I. Ravinovich, Kazuyoshi Kurita, B. Bassalleck, A. Dion, W. S. Emam, Y. Nagata, I. Garishvili, Akio Kiyomichi, F. Wei, Debashish Pal, K. Kiriluk, A. Drees, M. Bai, Y. L. Yamaguchi, S. Sawada, J. Ying, A. Franz, B. Komkov, M. Konno, J. Kubart, N. Kurihara, H. Kanou, Taku Gunji, H. Gong, Ryugo S. Hayano, J. Seele, Atsushi Taketani, K. Sakashita, H. Liu, F. Kajihara, C. Y. Chi, Anne Marie Sickles, Y. Riabov, Kenta Shigaki, K. Shoji, H. W. Van Hecke, Norio Saito, Tamas Ferenc Csorgo, M. A. L. Leite, J. T. Mitchell, A. Enokizono, H. Delagrange, R. Seidl, M. Nguyen, Vladislav Manko, K. S. Joo, R. Bennett, J. L. Nagle, C. M. Camacho, Prashant Shukla, A. S. Nyanin, P. W. Stankus, M. Slunečka, M. Finger, J. S. Kapustinsky, S. F. Pate, Rachid Nouicer, V. Babintsev, J. Egdemir, S. Belikov, Jason Kamin, S. Zhou, S. Bathe, S. P. Stoll, S. D. Rolnick, Agneta Oskarsson, H. Al-Bataineh, T. Ichihara, G. R. Young, Matthew G. Reuter, Y. Berdnikov, Takahiro Fusayasu, Y. Akiba, O. Dietzsch, C. Vale, B. S. Chang, M. Mishra, Alexander Malakhov, S. S.E. Rosendahl, G. Bunce, B. Love, E. T. Atomssa, H. Valle, S. Nagamiya, V. Papavassiliou, Sébastien Gadrat, D. Sharma, Christine Angela Aidala, J. Klay, R. Ichimiya, K. Dehmelt, Vaclav Vrba, Klaus Johannes Reygers, D. Silvermyr, L. S. Zolin, A. G. Litvinenko, Dipanwita Dutta, Jen-Chieh Peng, W. J. Park, A. Churyn, A. Kiss, M. Mitrovski, P. D. Barnes, A. Yanovich, D. Jouan, Julia Velkovska, Z. Yasin, Henner Buesching, S. N. White, A. Kozlov, R. Seto, K. Haruna, M. Wysocki, Xiong Wang, Zvi Hirsh Citron, Marcus Hohlmann, Dong Jo Kim, Osamu Jinnouchi, K. Nakano, W. E. Sondheim, S. Takagi, D. Ivanischev, Hiroaki Ohnishi, K. B. Lee, K. N. Barish, S. Afanasiev, A. Ster, P. A. Rukoyatkin, A. Veicht, John Hill, I. Tserruya, Yu. Efremenko, V. Singh, P. Ruička, P. Liebing, D. Hornback, Toru Sugitate, L. D. Isenhower, M. Heffner, M. L. Brooks, A. Taranenko, X. He, O. O. Omiwade, Kazushi Miki, François Fleuret, Brajesh K. Singh, V. Peresedov, Beau Meredith, V. S. Pantuev, J. Koster, Alexander Milov, I. Nakagawa, T. Engelmore, D. Roach, K. M. Kijima, O. Drapier, Frank Ellinghaus, T. Lika, S. Batsouli, H. Masui, A. K. Dubey, Junji Tojo, E. R. Kinney, A. A. Bickley, Hiroyuki Okada, D. P. Morrison, S. Campbell, Eva Haslum, B. Lenzi, K. Okada, B. Sahlmueller, H. En'yo, M. J. Leitch, V. E. Semenov, J. Zimányi, Tatsuya Chujo, Xingguo Li, M. Gonin, A. Sukhanov, H. Pereira, Y. Morino, S. P. Sorensen, Dylan Walker, Seong H. Kim, J. G. Lajoie, T. Hachiya, I. J. Choi, A. Kravitz, Minghui Liu, Kenneth Francis Read, Tadaaki Isobe, P. L. McGaughey, M. Chiu, A. V. Kazantsev, A. Hadj Henni, Maya Hachiya Shimomura, Y. I. Makdisi, M. J. Tannenbaum, H. Torii, D. Mukhopadhyay, S. Rembeczki, J. Chiba, Beomkyu Kim, K. Boyle, T. C. Awes, Kyoichiro Ozawa, Takao Sakaguchi, C. Klein-Boesing, Jun Kikuchi, A. D. Frawley, T. Tabaru, S. Huang, S. H. Aronson, W. Holzmann, Wei Xie, M. I. Nagy, M. Issah, M. D. Malik, E. Vznuzdaev, L. Aphecetche, Johannes Peter Wessels, H. A. Gustafsson, C. Zhang, R. Vértesi, Viktor Riabov, A. P.T. Palounek, S. Esumi, W. A. Zajc, Jason Newby, V. Baublis, A. Denisov, V. Cianciolo, Y. Tomita, J. E. Frantz, Sergey Fokin, E. J. Desmond, M. Togawa, J. Park, Y. Tsuchimoto, I. E. Yushmanov, Alexei Khanzadeev, E. Stenlund, H. Sakata, T. V. Moukhanova, and Charles Maguire

Subjects
Quark, Semileptonic decay, Quantum chromodynamics, Physics, Particle physics, 010308 nuclear & particles physics, Hadron, General Physics and Astronomy, Electron, 01 natural sciences, Nuclear physics, Momentum, 0103 physical sciences, High Energy Physics::Experiment, Charm (quantum number), Nuclear Experiment, 010306 general physics, Relativistic Heavy Ion Collider
Abstract

The momentum distribution of electrons from semileptonic decays of charm and bottom quarks for midrapidity |y| e(+/-)K(-/+)X (K unidentified) reconstruction. It is found that the yield of electrons from bottom becomes significant above 4 GeV/c in p(T). A fixed-order-plus-next-to-leading-log perturbative quantum chromodynamics calculation agrees with the data within the theoretical and experimental uncertainties. The extracted total bottom production cross section at this energy is sigma(bb)=3.2(-1.1)(+1.2)(stat)(-1.3)(+1.4)(syst)mu b.

Published
2009
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43. Suppression Pattern of Neutral Pions at High Transverse Momentum inAu+AuCollisions atsNN=200 GeVand Constraints on Medium Transport Coefficients

Author

S. Esumi, Y. J. Mao, S. Kametani, B. Love, R. A. Soltz, Marie Germain, Minghui Liu, E. H. Kim, J. H. Kang, W. A. Zajc, David D'Enterria, J. S. Haggerty, M. Grosse Perdekamp, A. G. Litvinenko, Kenneth Francis Read, C. Silvestre, M. Chiu, Marisilvia Donadelli, V. Bumazhnov, Andry Malala Rakotozafindrabe, K. Hasuko, A. Romana, Roy A. Lacey, Rushan Han, M. N. Hagiwara, T. A. Shibata, V. Baublis, A. Denisov, V. Cianciolo, M. Issah, R. P. Pisani, F. Matathias, J. L. Drachenberg, K. Dehmelt, Evert Stenlund, Kensuke Homma, M. D. Malik, E. Vznuzdaev, Nikolay Tyurin, E. J. Desmond, A. Kozlov, K. S. Sim, J. Chiba, Hiroyuki Okada, Joakim Nystrand, Jen-Chieh Peng, D. Winter, M. P. Comets, Sergey Fokin, S. Chernichenko, H. Lim, M. N. Wagner, A. V. Kazantsev, S. P. Sorensen, D. Isenhower, A. Hadj Henni, Dylan Walker, R. Seto, K. Haruna, B. Bassalleck, D. Yu Peressounko, M. Togawa, J. Park, Florian Bauer, D. E. Fields, A. Toia, Eva Haslum, B. Lenzi, Y. Kwon, K. Boyle, Wei Xie, T. Horaguchi, G. C. Mishra, L. Mašek, A. Shevel, B. V. Jacak, Xiong Wang, Takao Sakaguchi, Y. S. Lai, M. Konno, P. Tarján, H. Hiejima, V. Dzhordzhadze, S. Takagi, Y. Tsuchimoto, T. Hester, C. Klein-Boesing, Dong Jo Kim, P. Mikeš, M. McCumber, A. K. Purwar, Osamu Jinnouchi, M. Ouchida, J. G. Lajoie, J. Asai, R. Pak, K. N. Barish, A. D. Frawley, Xiao-yan Li, Y. Nakamiya, T. Tabaru, Yoichiro Fukao, T. Hachiya, S. Batsouli, H. Kanou, Taku Gunji, H. Gong, J. Seele, I. E. Yushmanov, J. G. Boissevain, Senta Greene, Ingvar Otterlund, K. O. Eyser, K. Fujiwara, N. Kamihara, N. Grau, S. H. Aronson, K. Imai, O. Zaudtke, S. Afanasiev, A. Ster, Alexei Khanzadeev, G. Baksay, S. Kelly, N. N. Ajitanand, V-N. Tram, B. E. Norman, Masashi Kaneta, W. Holzmann, Christophe Pierre Suire, Alexander Milov, I. Nakagawa, Johannes Peter Wessels, M. T. Bjorndal, T. C. Awes, Kyoichiro Ozawa, T. Liška, R. Armendariz, I. J. Choi, A. Kravitz, E. O'Brien, Hiroaki Ohnishi, Shingo Sakai, F. Kajihara, K. Shoji, H. Sakata, J. Newby, O. Drapier, Frank Ellinghaus, Maya Hachiya Shimomura, Takahiro Nakamura, Kazuyoshi Kurita, Jun Kikuchi, Y. I. Makdisi, Motoi Inaba, Tadaaki Isobe, E. R. Kinney, D. P. Morrison, M. C. McCain, G. S. Kyle, C. L. Woody, C. Pinkenburg, S. Campbell, Susumu Oda, James Alexander, Charles Maguire, S. Leckey, J. S. Chai, H. Delagrange, A. Drees, T. Shohjoh, J. T. Mitchell, A. Durum, V. E. Semenov, A. P.T. Palounek, Anne Marie Sickles, M. Virius, N. Willis, J. Zimányi, M. L. Brooks, J. Kubart, P. W. Stankus, R. Seidl, Vladislav Manko, Tatsuya Chujo, R. Averbeck, I. Tserruya, P. L. McGaughey, D. S. Brown, Byung-Sik Hong, M. Slunečka, A. Bazilevsky, M. J. Tannenbaum, Yu. Efremenko, M. Stepanov, G. Roche, Philippe Rosnet, V. Singh, D. Hornback, Anders Oskarsson, O. O. Omiwade, Alexandre Lebedev, H. W. Van Hecke, S. Zhou, K. Das, T. V. Moukhanova, D. M. Lee, J. Gosset, M. Heffner, I. V. Sourikova, E. P. Hartouni, Steven E. Skutnik, J. P. Sullivan, C. Vale, D. Mukhopadhyay, S. Rembeczki, V. Peresedov, Y. Le Bornec, D. Bucher, T. L. Thomas, C. Zhang, B. S. Chang, C. A. Ogilvie, T. K. Hemmick, X. He, Xingguo Li, Yasuo Miake, Robert F. Hobbs, A. Taranenko, Hirohiko Sato, Kazushi Miki, Y. L. Yamaguchi, Christine Angela Aidala, J. Klay, G. R. Young, S. K. Tuli, Y. S. Kim, B. Komkov, Ryugo S. Hayano, Hans-Åke Gustafsson, M. Gonin, S. Bathe, Y. Riabov, L. Kochenda, J. L. Charvet, Norio Saito, Kenta Shigaki, H. Masui, Viktor Riabov, M. A. L. Leite, H. Pereira, A. K. Dubey, M. Nguyen, Jan Rak, A. S. Nyanin, S. Yokkaichi, J. M. Heuser, A. A. Bickley, T. Kawagishi, H. Qu, Josh Moss, R. Granier de Cassagnac, A. Adare, Debashish Pal, T. E. Miller, Hideki Hamagaki, K. Aoki, J. Egdemir, S. Sawada, Y. Berdnikov, G. David, J. Ying, V. Babintsev, A. Franz, Y. Cobigo, E. T. Atomssa, Jason Kamin, S. P. Stoll, S. S.E. Rosendahl, G. Bunce, R. Vértesi, C. R. Cleven, C. Haegemann, Y. Inoue, Y. Akiba, A. Churyn, M. Mishra, S. Nagamiya, Kazuhiro Tanaka, P. Chung, D. Jouan, J. Imrek, M. Holmes, J. E. Frantz, Vaclav Vrba, Klaus Johannes Reygers, E. Kistenev, P. J. Kroon, Dong-Hun Kim, W. S. Emam, Laurent Bernard Aphecetche, M. Mitrovski, Herve Borel, D. Lynch, A. Glenn, A. Kiss, M. Wysocki, V. L. Rykov, T. Dahms, Z. Yasin, H. Harada, I. Ravinovich, Henner Buesching, Y. Nagata, M. B. Deaton, S. F. Pate, S. S. Ryu, Marcus Hohlmann, Y. Tanaka, R. Bennett, T. K. Shea, Ahmed Al-Jamel, M. Finger, H. Al-Bataineh, V. Papavassiliou, Sébastien Gadrat, F. Staley, L. Baksay, H. Pei, M. Rosati, Bruno Espagnon, A. A. Vinogradov, Henrik Tydesjö, Jiangyong Jia, Y. Goto, O. Dietzsch, H. Valle, L. Tomášek, Julia Velkovska, V. S. Pantuev, D. Kawall, K. Tanida, M. Harvey, V. I. Kochetkov, D. Silvermyr, J. Murata, Gerd Joachim Kunde, I. Shein, Junji Tojo, Alberto Baldisseri, K. Okada, B. Sahlmueller, H. En'yo, P. Constantin, M. J. Leitch, R. S. Towell, I. Garishvili, Akio Kiyomichi, M. Naglis, J. M. Burward-Hoy, C. L. Silva, N. Kurihara, W. C. Smith, Tae-Yeon Lee, Martin Purschke, F. Gastineau, D. Kotchetkov, A. Morreale, Z. Fraenkel, Masayasu Ishihara, S. Belikov, K. S. Joo, M. K. Lee, Susumu Sato, D. Sharma, M. G. Hur, C. Y. Chi, B. Azmoun, A. Král, M. J. Kweon, A. Deshpande, M. Oka, A. Dion, Atsushi Taketani, A. Enokizono, Y. Watanabe, I. Younus, A. Soldatov, C. P. Singh, B. M. Johnson, A. Isupov, S. Butsyk, Vladimir Samsonov, Tamas Ferenc Csorgo, J. L. Nagle, J. Sziklai, Brian Cole, Saskia Mioduszewski, J. Jin, E. M. Takagui, S. N. White, K. Nakano, W. E. Sondheim, P. A. Rukoyatkin, T. Ichihara, Matthew G. Reuter, Takahiro Fusayasu, I. D. Ojha, Alexander Malakhov, L. S. Zolin, W. J. Park, P. D. Barnes, A. Yanovich, S. Y. Fung, John Hill, H. A. Torii, Toru Sugitate, L. D. Isenhower, François Fleuret, B. Forestier, and Mate Csanad

Subjects
Quenching, Physics, Spectral shape analysis, 010308 nuclear & particles physics, Root (chord), General Physics and Astronomy, Parton, Transport theory, 01 natural sciences, Measure (mathematics), Nuclear physics, Pion, 0103 physical sciences, Transverse momentum, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

For Au + Au collisions at 200 GeV, we measure neutral pion production with good statistics for transverse momentum, p(T), up to 20 GeV/c. A fivefold suppression is found, which is essentially constant for 5 in the parton quenching model. The spectral shape is similar for all collision classes, and the suppression does not saturate in Au + Au collisions.

Published
2008
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44. Onset ofπ0Suppression Studied inCu+CuCollisions atsNN=22.4, 62.4, and 200 GeV

Author

M. J. Tannenbaum, H. Torii, D. Mukhopadhyay, S. Rembeczki, S. P. Sorensen, Dylan Walker, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Andry Malala Rakotozafindrabe, S. Dairaku, Charles Maguire, Seong H. Kim, R. Tanabe, D. Layton, J. G. Lajoie, T. Hachiya, I. J. Choi, A. Kravitz, W. C. Chang, Roy A. Lacey, N. N. Ajitanand, Rushan Han, Takahiro Nakamura, Susumu Oda, D. Lynch, A. Durum, V. L. Rykov, T. Dahms, S. Butsyk, Vladimir Samsonov, Ajit Kumar Mohanty, T. A. Shibata, T. Sato, Catherine Micaela Silvestre, K. Yamaura, O. Zaudtke, Tamas Ferenc Csorgo, E. Kistenev, M. Virius, J. L. Nagle, B. Azmoun, D. Isenhower, Y. Onuki, Hiroaki Ohnishi, K. B. Lee, A. Toia, A. Král, R. Vértesi, M. J. Kweon, M. Gonin, A. Glenn, L. Mašek, A. Sukhanov, H. Pereira, C. M. Camacho, Y. Morino, A. V. Kazantsev, H. Harada, K. O. Eyser, M. Oka, A. K. Purwar, Prashant Shukla, K. Fujiwara, D. Roach, K. M. Kijima, I. Ravinovich, J. Chiba, Y. Nagata, T. Niita, M. Bai, Xingguo Li, A. Dion, G. S. Kyle, Takao Sakaguchi, C. Klein-Boesing, R. Bennett, S. F. Pate, Steven E. Skutnik, D. E. Fields, M. Finger, J. L. Charvet, James Alexander, R. S. Towell, P. Tarján, Atsushi Taketani, A. Enokizono, A. Shevel, A. D. Frawley, T. Tabaru, B. V. Jacak, J. E. Frantz, M. B. Deaton, Tae-Yeon Lee, Martin Purschke, Jan Rak, R. Averbeck, Byung-Sik Hong, K. A. Drees, H. Al-Bataineh, A. Bazilevsky, S. Huang, S. H. Aronson, T. E. Miller, M. Naglis, M. Kurosawa, E. T. Atomssa, M. McCumber, Y. Tanaka, J. T. Mitchell, Philippe Rosnet, M. K. Lee, C. L. Silva, I. Garishvili, Akio Kiyomichi, F. Wei, W. Holzmann, C. A. Ogilvie, Alexei Khanzadeev, T. Hester, R. Granier de Cassagnac, L. Tomášek, T. K. Hemmick, P. Chung, Alexandre Lebedev, D. M. Lee, V. S. Pantuev, A. Adare, L. Baksay, Masayasu Ishihara, Susumu Sato, E. Stenlund, H. Sakata, R. Seidl, Vladislav Manko, H. Qu, J. Imrek, W. S. Emam, K. Das, D. Kotchetkov, N. Kurihara, E. P. Hartouni, K. Kiriluk, H. Pei, F. Staley, H. Kanou, Taku Gunji, H. Gong, J. Seele, M. Slunečka, K. Dehmelt, V. Papavassiliou, Sébastien Gadrat, Robert F. Hobbs, Jen-Chieh Peng, Senta Greene, Junji Tojo, A. T. Basye, P. Mikeš, B. E. Norman, B. Fadem, E. O'Brien, R. A. Soltz, H. Borel, Yasuo Miake, Y. L. Yamaguchi, Xiong Wang, L. Aphecetche, B. Komkov, S. Belikov, Yoichiro Fukao, Dong Jo Kim, A. Morreale, F. Kajihara, K. Okada, M. Grosse Perdekamp, Osamu Jinnouchi, A. Deshpande, Z. Fraenkel, C. Y. Chi, B. Sahlmueller, T. C. Awes, Kyoichiro Ozawa, T. Liška, L. Kochenda, H. En'yo, Jun Kikuchi, Hideki Hamagaki, K. Aoki, T. V. Moukhanova, H. Delagrange, Norio Saito, A. Veicht, M. J. Leitch, G. David, O. Dietzsch, H. Valle, Debashish Pal, C. Vale, B. S. Chang, S. Sawada, V-N. Tram, N. Grau, Johannes Peter Wessels, M. A. L. Leite, Alexander Milov, H. W. Vanhecke, Dipanwita Dutta, J. Ying, A. Franz, I. Nakagawa, Christine Angela Aidala, T. Engelmore, J. Klay, R. K. Choudhury, Y. Watanabe, E. J. Desmond, O. Drapier, Frank Ellinghaus, D. Winter, D. Yu Peressounko, Anne Marie Sickles, Saskia Mioduszewski, E. R. Kinney, Motoi Inaba, I. Younus, K. S. Joo, D. P. Morrison, M. Togawa, S. Campbell, S. Zhou, Minghui Liu, B. Meredith, F. Matathias, Kensuke Homma, Mate Csanad, M. I. Nagy, V. E. Semenov, J. Park, M. Issah, J. Zimányi, A. Baldisseri, Kenneth Francis Read, Tatsuya Chujo, I. Tserruya, A. Soldatov, D. Kawall, K. Tanida, H. Themann, J. S. Kapustinsky, P. Constantin, S. Chernichenko, Yu. Efremenko, M. D. Malik, Julia Velkovska, E. Vznuzdaev, V. Singh, P. Liebing, Y. Tsuchimoto, V. I. Kochetkov, M. Mitrovski, V. Babintsev, H. Liu, R. Pak, B. Bassalleck, G. R. Young, Tadaaki Isobe, J. Murata, E. H. Kim, J. Jin, I. E. Yushmanov, David D'Enterria, M. Konno, K. Shoji, E. M. Takagui, N. Kamihara, M. Wysocki, Gerd Joachim Kunde, I. Shein, C. Baumann, P. L. McGaughey, C. P. Singh, Y. Nakamiya, M. Chiu, M. Rosati, A. Hadj Henni, P. W. Stankus, B. M. Johnson, X. He, O. O. Omiwade, R. Armendariz, Beomkyu Kim, K. Boyle, Kazuyoshi Kurita, K. S. Sim, V. Dzhordzhadze, K. Sedgwick, G. Baksay, V. Peresedov, D. Sharma, R. Ichimiya, M. N. Wagner, A. Isupov, C. Suire, Y. Kwon, Wei Xie, J. Koster, A. Drees, J. Sziklai, R. Yang, H. Hiejima, Brian Cole, A. A. Vinogradov, K. Imai, J. Kubart, S. Batsouli, H. Masui, K. Sakashita, J. Egdemir, Jiangyong Jia, A. K. Dubey, A. A. Bickley, Jason Kamin, S. Takagi, S. P. Stoll, Y. Goto, S. S.E. Rosendahl, G. Bunce, C. R. Cleven, K. N. Barish, C. Haegemann, Y. Inoue, A. Churyn, D. Jouan, T. Kempel, Dong-Hun Kim, M. L. Brooks, B. Love, A. G. Litvinenko, A. Kozlov, R. Seto, K. Haruna, S. Esumi, W. A. Zajc, M. Ouchida, N. Means, J. Asai, V. Baublis, A. Denisov, V. Cianciolo, A. Kiss, Z. Yasin, Henner Buesching, Shingo Sakai, Marcus Hohlmann, Y. Tomita, S. Bathe, Agneta Oskarsson, Y. Berdnikov, Y. Akiba, M. Mishra, S. Nagamiya, Vaclav Vrba, Klaus Johannes Reygers, T. L. Thomas, Sergey Fokin, Ryugo S. Hayano, Y. Riabov, Kenta Shigaki, M. Nguyen, A. S. Nyanin, Rachid Nouicer, C. L. Woody, A. Berdnikov, S. D. Rolnick, H. A. Gustafsson, I. V. Sourikova, C. Zhang, P. Ružička, Viktor Riabov, T. Ichihara, Matthew G. Reuter, Takahiro Fusayasu, A. P.T. Palounek, Alexander Malakhov, D. Silvermyr, L. S. Zolin, W. J. Park, P. D. Barnes, A. Yanovich, S. N. White, Y. J. Mao, S. Kametani, T. Horaguchi, Zvi Hirsh Citron, K. Nakano, J. H. Kang, W. E. Sondheim, J. S. Haggerty, S. Afanasiev, D. Ivanischev, A. Ster, A. Romana, J. Newby, P. A. Rukoyatkin, John Hill, D. Hornback, M. Heffner, Toru Sugitate, L. D. Isenhower, A. Taranenko, François Fleuret, Kazushi Miki, Brajesh K. Singh, Y. S. Lai, Hiroyuki Okada, Eva Haslum, A. Yu. Semenov, B. Lenzi, J. Gosset, S. Yokkaichi, Y. Ikeda, J. G. Boissevain, E. J. Mannel, Masashi Kaneta, C. Pinkenburg, M. Stepanov, G. Roche, Maya Hachiya Shimomura, and Y. I. Makdisi

Subjects
Physics, Energy loss, Quantitative Biology::Neurons and Cognition, 010308 nuclear & particles physics, General Physics and Astronomy, chemistry.chemical_element, Parton, Inelastic scattering, 01 natural sciences, Copper, Spectral line, Nuclear physics, Pion, chemistry, 0103 physical sciences, Transverse momentum, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics, Jet quenching
Abstract

Neutral pion transverse momentum (p(T)) spectra at midrapidity (|y| less than or similar to 0.35) were measured in Cu + Cu collisions at root s(NN) = 22.4, 62.4, and 200 GeV. Relative to pi(0) yields in p + p collisions scaled by the number of inelastic nucleon-nucleon collisions (N-coll) the pi(0) yields for p(T) greater than or similar to 2 GeV/c in central Cu + Cu collisions are suppressed at 62.4 and 200 GeV whereas an enhancement is observed at 22.4 GeV. A comparison with a jet-quenching model suggests that final state parton energy loss dominates in central Cu + Cu collisions at 62.4 and 200 GeV, while the enhancement at 22.4 GeV is consistent with nuclear modifications in the initial state alone.

Published
2008
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45. Charged hadron multiplicity fluctuations inAu+AuandCu+Cucollisions fromsNN=22.5to 200 GeV

Author

Yu. Efremenko, Martin Purschke, F. Gastineau, V. Singh, G. B. Kim, D. Kotchetkov, Mate Csanad, J. G. Boissevain, A. Morreale, B. Khachaturov, Z. Fraenkel, Alexei Khanzadeev, Masashi Kaneta, T. Matsumoto, N. Bruner, E. Stenlund, N. N. Ajitanand, David D'Enterria, Hirohiko Sato, H. Sakata, K. Katou, K. Hasuko, S. K. Tuli, R. K. Choudhury, S. S. Adler, G. S. Kyle, C. Pinkenburg, P. Tarján, Sean A. Kelly, N. Willis, R. P. Pisani, James Alexander, Tadaaki Isobe, L. Tomášek, Takahiro Nakamura, V. S. Pantuev, Hiroyuki Okada, A. Hadj Henni, R. Averbeck, J. S. Chai, Susumu Oda, Byung-Sik Hong, A. Bazilevsky, Viktor Veszpremi, Nikolay Tyurin, K. S. Sim, M. Stepanov, G. Roche, Y. J. Mao, S. Kametani, M. Harvey, Pàl Hidas, Saskia Mioduszewski, Joakim Nystrand, Eva Haslum, B. Lenzi, M. N. Wagner, J. H. Kang, Junji Tojo, Y. Watanabe, J. M. Burward-Hoy, J. S. Haggerty, T. Shohjoh, A. Durum, W. C. Smith, L. Sanfratello, K. Boyle, Wei Xie, T. V. Moukhanova, Philippe Rosnet, M. K. Lee, K. Ozawa, K. Okada, S. Belikov, K. S. Joo, P. L. McGaughey, B. Sahlmueller, H. En'yo, P. Constantin, A. Romana, Alexandre Lebedev, M. J. Leitch, Yves Roland Schutz, O. Dietzsch, K. O. Eyser, K. Fujiwara, J. L. Drachenberg, H. Hiejima, D. S. Brown, J. E. Frantz, H. Valle, C. H. Kuberg, C. Silvestre, D. M. Lee, D. Kawall, K. Dehmelt, Xiaopeng Zong, Jen-Chieh Peng, S. Afanasiev, A. Ster, J. Chiba, J. Jin, Dipanwita Dutta, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Andry Malala Rakotozafindrabe, E. M. Takagui, K. Tanida, V. I. Kochetkov, R. Pak, R. S. Towell, Y. S. Lai, Herve Borel, D. Lynch, A. Shevel, G. C. Mishra, D. E. Fields, B. D. Fox, Robert F. Hobbs, Ferenc Deák, K. Imai, Julia Velkovska, I. Garishvili, Akio Kiyomichi, Y. L. Yamaguchi, D. Sharma, B. Komkov, R. Vértesi, B. V. Jacak, J. Murata, N. Kamihara, R. Armendariz, T. Hester, Takao Sakaguchi, Kazuyoshi Kurita, Senta Greene, N. Kurihara, J. Gosset, M. Rosati, Charles Maguire, H. W. Van Hecke, J. P. Sullivan, A. Glenn, Dong Jo Kim, S. Leckey, C. Klein-Boesing, Minghui Liu, M. Velkovsky, S. Batsouli, Norio Saito, Anne Marie Sickles, S. P. Sorensen, D. Hornback, F. Matathias, M. McCumber, A. K. Purwar, A. D. Frawley, M. Heffner, C. R. Cleven, C. Haegemann, Y. Inoue, Dylan Walker, A. Drees, Gerd Joachim Kunde, J. Kubart, S. C. Johnson, M. G. Hur, C. Y. Chi, B. Azmoun, A. Král, Youngil Kwon, W. C. Chang, Kensuke Homma, I. Shein, M. A. L. Leite, M. J. Kweon, T. Tabaru, Ch. Finck, V. L. Rykov, T. Dahms, Kenneth Francis Read, Jason Newby, A. Taranenko, R. Kohara, J. Egdemir, P. J. Kroon, B. E. Norman, Y. Le Bornec, Osamu Jinnouchi, Josh Moss, E. O'Brien, Dong-Hun Kim, A. A. Vinogradov, Henrik Tydesjö, Jason Kamin, M. C. McCain, V-N. Tram, S. H. Aronson, A. Kiss, I. Ravinovich, M. Oka, V. Babintsev, J. G. Lajoie, T. Hachiya, R. A. Soltz, L. Aphecetche, Motoi Inaba, Takeo Kawabata, S. P. Stoll, Jiangyong Jia, Y. Goto, Y. Nagata, S. S.E. Rosendahl, Debashish Pal, G. Bunce, S. Sawada, G. R. Young, W. Holzmann, Z. Yasin, Henner Buesching, C. L. Woody, P. Chand, Marcus Hohlmann, Rushan Han, M. N. Hagiwara, S. Butsyk, Vladimir Samsonov, A. P.T. Palounek, C. P. Singh, B. M. Johnson, S. Esumi, A. Churyn, I. Otterlund, M. Grosse Perdekamp, Maya Hachiya Shimomura, Y. I. Makdisi, Kazushi Miki, A. Dion, E. J. Desmond, Jean-Pierre Cussonneau, M. Togawa, S. N. White, Atsushi Taketani, A. Enokizono, E. H. Kim, I. J. Choi, A. Kravitz, D. Jouan, S. Chernichenko, H. Lim, B. Bassalleck, N. Grau, K. Shoji, J. Park, Johannes Peter Wessels, Florian Bauer, M. A. Volkov, W. A. Zajc, E. Kistenev, S. S. Ryu, M. Konno, P. W. Stankus, K. Das, E. P. Hartouni, J. Ying, A. Franz, Hiroaki Ohnishi, A. Pierson, M. Ouchida, Alberto Baldisseri, A. Isupov, C. Suire, V. Baublis, A. Denisov, V. Cianciolo, H. Kobayashi, S. Bathe, Y. Tsuchimoto, M. Issah, J. M. Qualls, H. Harada, J. Asai, Sergey Fokin, C. A. Ogilvie, M. J. Tannenbaum, R. Bennett, K. Nakano, Agneta Oskarsson, T. K. Hemmick, M. D. Malik, E. Vznuzdaev, Xiao-yan Li, Jan Rak, Yasuo Miake, J. Sziklai, I. E. Yushmanov, H. Pei, T. Horaguchi, A. Hoover, Steven E. Skutnik, V. V. Ikonnikov, Y. Berdnikov, Y. Akiba, R. Lacey, M. Mishra, S. Nagamiya, Brian Cole, J. T. Mitchell, Kazuhiro Tanaka, L. Kochenda, D. Mukhopadhyay, Ahmed Al-Jamel, David Olle Rickard Silvermyr, W. E. Sondheim, M. Finger, S. Rembeczki, R. Granier de Cassagnac, Vaclav Vrba, Klaus Johannes Reygers, B. Espagnon, A. Adare, A. G. Hansen, Shingo Sakai, D. Bucher, M. Naglis, D. Winter, H. A. Gustafsson, D. Yu Peressounko, T. Kawagishi, C. L. Silva, O. Zaudtke, Tamas Ferenc Csorgo, T. L. Thomas, H. Qu, C. Zhang, R. Seidl, Xingguo Li, M. Gonin, Alexander Milov, I. Nakagawa, Vladislav Manko, V.N. Penev, P. A. Rukoyatkin, O. Drapier, Frank Ellinghaus, H. J. Kim, M. Virius, Viktor Riabov, M. Inuzuka, Hideki Hamagaki, K. Aoki, G. David, H. Pereira, Ryugo S. Hayano, M. Slunečka, S. Y. Fung, J. L. Nagle, Masayasu Ishihara, E. R. Kinney, D. P. Morrison, Y. Riabov, S. Campbell, Kenta Shigaki, Susumu Sato, V. E. Semenov, J. Zimányi, M. Nguyen, Tatsuya Chujo, M. Muniruzzaman, A. S. Nyanin, A. Deshpande, X. Camard, John Hill, K. Oyama, Y. Cobigo, C. Vale, B. S. Chang, Toru Sugitate, M. B. Deaton, L. D. Isenhower, M. Mitrovski, Christine Angela Aidala, J. Klay, I. Younus, Y. Nakamiya, Y. Tanaka, T. K. Shea, M. Wysocki, A. Soldatov, François Fleuret, B. Forestier, G. Baksay, I. V. Sourikova, H. Torii, T. Ichihara, M. T. Bjorndal, S. F. Pate, F. K. Wohn, Matthew G. Reuter, H. Al-Bataineh, X. R. Wang, F. Staley, L. Baksay, Takahiro Fusayasu, I. D. Ojha, Alexander Malakhov, V. Papavassiliou, Sébastien Gadrat, L. S. Zolin, W. J. Park, P. D. Barnes, A. Yanovich, A. V. Kazantsev, P. Mikeš, Yoichiro Fukao, T. C. Awes, T. Liška, Jun Kikuchi, S. Yokkaichi, J. M. Heuser, M. Chiu, Ajit Kumar Mohanty, T. A. Shibata, D. Isenhower, A. Toia, L. Mašek, German Martinez, H. Kanou, A. Devismes, Taku Gunji, H. Gong, J. Seele, F. Kajihara, H. Delagrange, S. Zhou, Y. S. Kim, J. L. Charvet, T. E. Miller, E. T. Atomssa, R. Santo, P. Chung, M. Holmes, W. S. Emam, X. He, O. O. Omiwade, V. Peresedov, H. Masui, A. K. Dubey, A. A. Bickley, B. Love, Marie Germain, A. G. Litvinenko, A. Kozlov, R. Seto, K. Haruna, V. Dzhordzhadze, S. Takagi, K. N. Barish, T. J. Uam, M. L. Brooks, Tae-Yeon Lee, and I. Tserruya

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Hadron, Collision, 01 natural sciences, Bin, Ion, Nuclear physics, Superposition principle, Strange matter, 0103 physical sciences, Cluster (physics), Multiplicity (chemistry), Nuclear Experiment, 010306 general physics
Abstract

A comprehensive survey of event-by-event fluctuations of charged hadron multiplicity in relativistic heavy ions is presented. The survey covers Au+Au collisions at s(NN) =62.4 and 200 GeV, and Cu+Cu collisions at s(NN) =22.5,62.4, and 200 GeV. Fluctuations are measured as a function of collision centrality, transverse momentum range, and charge sign. After correcting for nondynamical fluctuations due to fluctuations in the collision geometry within a centrality bin, the remaining dynamical fluctuations expressed as the variance normalized by the mean tend to decrease with increasing centrality. The dynamical fluctuations are consistent with or below the expectation from a superposition of participant nucleon-nucleon collisions based upon p+p data, indicating that this dataset does not exhibit evidence of critical behavior in terms of the compressibility of the system. A comparison of the data with a model where hadrons are independently emitted from a number of hadron clusters suggests that the mean number of hadrons per cluster is small in heavy ion collisions.

Published
2008
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46. J/ψProduction insNN=200 GeVCu+CuCollisions

Author

Martin Purschke, A. Shevel, Robert F. Hobbs, D. Kotchetkov, A. Morreale, G. S. Kyle, A. Kiss, Z. Yasin, Z. Fraenkel, James Alexander, R. Averbeck, Byung-Sik Hong, T. Hester, H. Pei, Henner Buesching, C. L. Woody, A. Bazilevsky, Philippe Rosnet, M. Issah, M. D. Malik, E. Vznuzdaev, Youngil Kwon, Alexandre Lebedev, A. Hadj Henni, D. M. Lee, C. R. Cleven, C. Haegemann, Y. Inoue, V-N. Tram, K. Boyle, Debashish Pal, S. Sawada, Marcus Hohlmann, Saskia Mioduszewski, Wei Xie, E. J. Desmond, J. Chiba, A. Deshpande, Motoi Inaba, M. Togawa, J. Park, Dong-Hun Kim, E. H. Kim, Takao Sakaguchi, K. O. Eyser, A. K. Purwar, K. Fujiwara, J. Ying, A. Franz, J. Jin, E. M. Takagui, L. Tomášek, Y. J. Mao, S. P. Sorensen, K. Das, Dylan Walker, J. Egdemir, O. Dietzsch, Y. Tsuchimoto, S. Kametani, V. S. Pantuev, Jason Kamin, C. Klein-Boesing, Tadaaki Isobe, D. E. Fields, J. G. Lajoie, T. Hachiya, L. Aphecetche, C. P. Singh, B. M. Johnson, E. P. Hartouni, S. P. Stoll, H. Valle, Johannes Peter Wessels, I. E. Yushmanov, B. V. Jacak, A. D. Frawley, T. Tabaru, Junji Tojo, J. H. Kang, J. S. Haggerty, A. Romana, S. S.E. Rosendahl, G. Bunce, N. Grau, Mate Csanad, K. Shoji, I. J. Choi, A. Kravitz, M. Gonin, A. Isupov, C. Suire, Hiroyuki Okada, A. Churyn, D. Lynch, Julia Velkovska, Eva Haslum, B. Lenzi, R. Vértesi, S. H. Aronson, K. Okada, B. Sahlmueller, D. Jouan, I. Younus, J. Sziklai, P. L. McGaughey, M. McCumber, H. En'yo, M. J. Leitch, Charles Maguire, H. W. Van Hecke, P. W. Stankus, H. Pereira, X. He, O. O. Omiwade, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, M. Mitrovski, Andry Malala Rakotozafindrabe, K. S. Joo, V. L. Rykov, T. Dahms, M. Rosati, Y. Nakamiya, W. Holzmann, M. Chiu, Brian Cole, David D'Enterria, V. Peresedov, Y. L. Yamaguchi, A. Soldatov, S. Bathe, B. Komkov, Hiroaki Ohnishi, Agneta Oskarsson, M. Wysocki, S. Afanasiev, Maya Hachiya Shimomura, A. Ster, A. A. Vinogradov, S. Esumi, Y. S. Lai, J. E. Frantz, Alexander Milov, I. Nakagawa, R. S. Towell, E. Kistenev, Jiangyong Jia, I. Garishvili, Akio Kiyomichi, P. Tarján, M. N. Wagner, Norio Saito, Y. Berdnikov, Y. Akiba, M. A. L. Leite, J. Newby, M. Mishra, S. Nagamiya, Alexei Khanzadeev, O. Drapier, Frank Ellinghaus, G. Baksay, I. Ravinovich, Y. Goto, Y. I. Makdisi, Steven E. Skutnik, E. Stenlund, Y. Nagata, E. R. Kinney, N. Kurihara, D. P. Morrison, W. A. Zajc, N. N. Ajitanand, H. Sakata, Vaclav Vrba, Klaus Johannes Reygers, D. Hornback, C. A. Ogilvie, H. Harada, T. K. Hemmick, S. Campbell, Yasuo Miake, Roy A. Lacey, Rushan Han, V. E. Semenov, M. Naglis, M. Heffner, J. G. Boissevain, A. Taranenko, J. Zimányi, Masashi Kaneta, C. Y. Chi, M. K. Lee, Tatsuya Chujo, K. Ozawa, K. Dehmelt, S. Batsouli, V. Baublis, A. Denisov, Takahiro Nakamura, Xingguo Li, H. Masui, A. K. Dubey, V. Babintsev, Jen-Chieh Peng, T. Ichihara, V. Cianciolo, L. Kochenda, C. L. Silva, H. Qu, J. T. Mitchell, S. F. Pate, R. Bennett, M. Finger, M. J. Tannenbaum, Kazushi Miki, H. Al-Bataineh, S. Butsyk, A. A. Bickley, M. B. Deaton, Vladimir Samsonov, C. Pinkenburg, Sergey Fokin, T. V. Moukhanova, O. Zaudtke, Y. Tanaka, Minghui Liu, Dong Jo Kim, Susumu Oda, Hideki Hamagaki, K. Aoki, R. Pak, Osamu Jinnouchi, G. David, N. Kamihara, X. R. Wang, Masayasu Ishihara, R. Armendariz, B. Love, M. Virius, D. Mukhopadhyay, S. Rembeczki, M. Stepanov, G. Roche, T. Horaguchi, Susumu Sato, A. Durum, R. Seidl, Kazuyoshi Kurita, Vladislav Manko, M. Slunečka, I. Tserruya, Yu. Efremenko, S. Belikov, A. Drees, V. Singh, V. Papavassiliou, J. Kubart, Sébastien Gadrat, J. Gosset, Catherine Micaela Silvestre, A. Glenn, Tamas Ferenc Csorgo, Kenneth Francis Read, F. Staley, I. V. Sourikova, A. G. Litvinenko, D. Kawall, J. L. Nagle, K. Tanida, Senta Greene, C. Vale, B. S. Chang, Christine Angela Aidala, J. Klay, V. I. Kochetkov, S. Yokkaichi, H. A. Gustafsson, B. E. Norman, J. Murata, M. Ouchida, E. O'Brien, A. Kozlov, R. A. Soltz, H. Borel, J. Asai, Matthew G. Reuter, F. Matathias, Kensuke Homma, Gerd Joachim Kunde, A. V. Kazantsev, R. Seto, M. Grosse Perdekamp, Shingo Sakai, I. Shein, L. Baksay, T. L. Thomas, Takahiro Fusayasu, C. Zhang, Ryugo S. Hayano, P. Constantin, S. Chernichenko, K. Haruna, B. Bassalleck, Y. Riabov, M. Konno, Kenta Shigaki, P. Mikeš, M. Nguyen, A. S. Nyanin, Yoichiro Fukao, Viktor Riabov, T. C. Awes, T. Liška, S. Takagi, D. Winter, D. Yu Peressounko, Jun Kikuchi, K. N. Barish, A. P.T. Palounek, M. L. Brooks, Alexander Malakhov, D. Silvermyr, L. S. Zolin, W. J. Park, P. D. Barnes, A. Yanovich, John Hill, H. A. Torii, Toru Sugitate, L. D. Isenhower, François Fleuret, S. N. White, D. Sharma, B. Azmoun, A. Král, M. J. Kweon, M. Oka, A. Dion, Atsushi Taketani, A. Enokizono, Anne Marie Sickles, G. R. Young, Jan Rak, R. Granier de Cassagnac, A. Adare, K. S. Sim, V. Dzhordzhadze, Y. Watanabe, H. Hiejima, K. Imai, T. A. Shibata, D. Isenhower, A. Toia, L. Mašek, J. L. Charvet, T. E. Miller, E. T. Atomssa, P. Chung, W. S. Emam, H. Kanou, Taku Gunji, H. Gong, J. Seele, F. Kajihara, H. Delagrange, S. Zhou, A. Baldisseri, K. Nakano, W. E. Sondheim, P. A. Rukoyatkin, and Tae-Yeon Lee

Subjects
Physics, Range (particle radiation), Quantitative Biology::Neurons and Cognition, 010308 nuclear & particles physics, Analytical chemistry, General Physics and Astronomy, chemistry.chemical_element, Plasma, Nuclear matter, 7. Clean energy, 01 natural sciences, Copper, Strange matter, chemistry, 0103 physical sciences, Energy density, High Energy Physics::Experiment, Rapidity, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

Yields for J/psi production in Cu+Cu collisions at root s(NN) = 200 GeV have been measured over the rapidity range |y|< 2.2 and compared with results in p+p and Au+Au collisions at the same energy. The Cu+Cu data offer greatly improved precision over existing Au+Au data for J/psi production in collisions with small to intermediate numbers of participants, in the range where the quark-gluon plasma transition threshold is predicted to lie. Cold nuclear matter estimates based on ad hoc fits to d+Au data describe the Cu+Cu data up to N-part similar to 50, corresponding to a Bjorken energy density of at least 1.5 GeV/fm(3).

Published
2008
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47. Dihadron azimuthal correlations in Au+Au collisions atsNN=200GeV

Author

S. Afanasiev, J. L. Drachenberg, B. Love, A. Ster, R. A. Soltz, I. Ravinovich, Y. Nagata, T. Ichihara, Marie Germain, S. P. Sorensen, Dylan Walker, C. Silvestre, A. G. Litvinenko, Tae-Yeon Lee, C. R. Cleven, C. Haegemann, Y. Inoue, N. Grau, P. J. Kroon, Dong-Hun Kim, M. Issah, S. S. Ryu, Marisilvia Donadelli, K. Shoji, Martin Purschke, Matthew G. Reuter, M. D. Malik, A. Deshpande, F. Gastineau, Takahiro Fusayasu, E. Vznuzdaev, J. G. Lajoie, P. W. Stankus, E. H. Kim, T. Hachiya, M. Grosse Perdekamp, V. Bumazhnov, M. P. Comets, A. Kozlov, R. Seto, K. Haruna, D. Hornback, I. J. Choi, A. Kravitz, R. Bennett, I. D. Ojha, Alexander Malakhov, Maya Hachiya Shimomura, Andry Malala Rakotozafindrabe, D. Kotchetkov, V. Dzhordzhadze, M. Heffner, Charles Maguire, S. Leckey, Steven E. Skutnik, A. Morreale, Tadaaki Isobe, Ahmed Al-Jamel, Y. I. Makdisi, M. Finger, X. He, Z. Fraenkel, J. S. Chai, A. Hadj Henni, O. O. Omiwade, H. A. Gustafsson, H. Qu, M. Gonin, A. Taranenko, Josh Moss, Y. Watanabe, V. S. Pantuev, Hideki Hamagaki, K. Aoki, Kazushi Miki, G. David, V. Peresedov, O. Dietzsch, D. Silvermyr, K. Boyle, Wei Xie, C. L. Woody, J. E. Frantz, Xiao-yan Li, Christophe Pierre Suire, Alexander Milov, I. Nakagawa, H. Valle, I. Younus, C. Zhang, B. Azmoun, E. Kistenev, H. Pereira, M. Harvey, A. Král, M. J. Kweon, S. Kelly, J. Gosset, L. S. Zolin, D. Winter, W. J. Park, D. Yu Peressounko, P. L. McGaughey, N. N. Ajitanand, H. Masui, A. K. Dubey, A. Soldatov, O. Drapier, Frank Ellinghaus, Y. Le Bornec, E. R. Kinney, Herve Borel, D. Lynch, Junji Tojo, P. Tarján, D. P. Morrison, M. Mitrovski, K. Hasuko, J. P. Sullivan, P. D. Barnes, Hiroaki Ohnishi, A. Yanovich, S. Campbell, Viktor Riabov, Julia Velkovska, A. Glenn, H. Harada, A. A. Bickley, S. Y. Fung, Hiroyuki Okada, G. S. Kyle, C. P. Singh, V. E. Semenov, M. Oka, K. Okada, N. Willis, James Alexander, M. Naglis, J. Zimányi, M. Rosati, Alexei Khanzadeev, B. Sahlmueller, S. Batsouli, V. L. Rykov, T. Dahms, M. B. Deaton, Joakim Nystrand, C. L. Silva, Eva Haslum, B. Lenzi, Tatsuya Chujo, K. Dehmelt, A. Dion, Jen-Chieh Peng, S. Takagi, H. En'yo, P. Constantin, R. Averbeck, Byung-Sik Hong, M. Wysocki, M. J. Tannenbaum, A. Bazilevsky, M. J. Leitch, L. Aphecetche, Y. Tanaka, L. Tomáek, Takahiro Nakamura, K. N. Barish, Bruno Espagnon, I. V. Sourikova, E. Stenlund, Masayasu Ishihara, H. Sakata, B. M. Johnson, John Hill, O. Zaudtke, Atsushi Taketani, A. Enokizono, M. C. McCain, Susumu Sato, T. L. Thomas, A. A. Vinogradov, Henrik Tydesjö, T. K. Shea, Roy A. Lacey, Xiong Wang, J. M. Burward-Hoy, S. F. Pate, Philippe Rosnet, K. Das, Jiangyong Jia, Y. Goto, H. A. Torii, Alexandre Lebedev, Toru Sugitate, S. Belikov, K. S. Joo, Rushan Han, L. D. Isenhower, D. Kawall, Senta Greene, K. Tanida, M. Virius, Dong Jo Kim, Osamu Jinnouchi, A. P.T. Palounek, Susumu Oda, Ryugo S. Hayano, Xingguo Li, E. P. Hartouni, F. Staley, L. Baksay, H. Al-Bataineh, A. Isupov, V. I. Kochetkov, D. M. Lee, Y. Riabov, M. L. Brooks, S. Yokkaichi, M. N. Hagiwara, J. M. Heuser, W. C. Smith, Kenta Shigaki, I. Tserruya, S. Esumi, T. Shohjoh, Yu. Efremenko, V. Singh, M. Nguyen, S. Butsyk, A. Durum, J. Murata, François Fleuret, D. Mukhopadhyay, B. Forestier, S. Rembeczki, Y. J. Mao, Minghui Liu, S. Kametani, Y. L. Yamaguchi, J. Sziklai, B. Komkov, W. A. Zajc, Johannes Peter Wessels, Gerd Joachim Kunde, Y. Cobigo, A. S. Nyanin, M. K. Lee, Brian Cole, V. Papavassiliou, Sébastien Gadrat, I. Shein, V. Baublis, A. Denisov, V. Cianciolo, B. E. Norman, Vladimir Samsonov, I. Otterlund, S. N. White, D. Sharma, J. H. Kang, E. O'Brien, Norio Saito, J. S. Haggerty, D. S. Brown, M. A. L. Leite, Hirohiko Sato, Robert F. Hobbs, A. Romana, S. K. Tuli, R. S. Towell, I. Garishvili, Akio Kiyomichi, Sergey Fokin, D. Bucher, Kenneth Francis Read, T. Horaguchi, Alberto Baldisseri, T. V. Moukhanova, Debashish Pal, N. Kurihara, S. Sawada, A. V. Kazantsev, J. Ying, A. Franz, M. Ouchida, J. Asai, D. E. Fields, J. Chiba, B. V. Jacak, V. Babintsev, E. J. Desmond, M. Togawa, J. Park, P. Mikeš, Y. S. Lai, Yoichiro Fukao, Shingo Sakai, M. G. Hur, C. Y. Chi, M. McCumber, A. K. Purwar, G. C. Mishra, T. C. Awes, Kyoichiro Ozawa, T. Liška, Florian Bauer, Jun Kikuchi, Y. Tsuchimoto, Takao Sakaguchi, J. G. Boissevain, Masashi Kaneta, Tamas Ferenc Csorgo, C. Klein-Boesing, Jan Rak, C. Pinkenburg, A. D. Frawley, T. Tabaru, I. E. Yushmanov, M. Stepanov, G. Roche, S. H. Aronson, Saskia Mioduszewski, W. Holzmann, J. L. Nagle, R. Vértesi, Jason Newby, J. Jin, E. M. Takagui, R. Granier de Cassagnac, A. Adare, Anne Marie Sickles, G. R. Young, K. S. Sim, Y. Kwon, H. Hiejima, K. Imai, J. T. Mitchell, Mate Csanad, R. Seidl, Vladislav Manko, M. Slunečka, M. Chiu, T. A. Shibata, C. Vale, B. S. Chang, Christine Angela Aidala, J. Klay, Y. Nakamiya, G. Baksay, M. T. Bjorndal, David D'Enterria, F. Matathias, Kensuke Homma, S. Chernichenko, H. Lim, B. Bassalleck, R. P. Pisani, D. Isenhower, A. Toia, M. Konno, Nikolay Tyurin, L. Mašek, M. N. Wagner, A. Shevel, T. Hester, V-N. Tram, Motoi Inaba, H. Kanou, Taku Gunji, H. Gong, J. Seele, A. Kiss, F. Kajihara, Z. Yasin, H. Delagrange, Henner Buesching, S. Zhou, Marcus Hohlmann, Y. S. Kim, J. L. Charvet, S. Bathe, Agneta Oskarsson, T. E. Miller, Y. Berdnikov, E. T. Atomssa, Y. Akiba, M. Mishra, S. Nagamiya, Kazuhiro Tanaka, P. Chung, Vaclav Vrba, Klaus Johannes Reygers, M. Holmes, W. S. Emam, K. O. Eyser, K. Fujiwara, H. W. Van Hecke, C. A. Ogilvie, T. K. Hemmick, Yasuo Miake, L. Kochenda, T. Kawagishi, R. Pak, N. Kamihara, R. Armendariz, Kazuyoshi Kurita, A. Drees, J. Kubart, J. Egdemir, Jason Kamin, S. P. Stoll, S. S.E. Rosendahl, G. Bunce, A. Churyn, D. Jouan, K. Nakano, W. E. Sondheim, P. A. Rukoyatkin, and H. Pei

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Posterior region, Hadron, Elliptic flow, 01 natural sciences, Spectral line, Nuclear physics, Azimuth, Shoulder region, 0103 physical sciences, Transverse momentum, High Energy Physics::Experiment, Atomic physics, Nuclear Experiment, 010306 general physics, Jet quenching
Abstract

Azimuthal angle (Delta phi) correlations are presented for a broad range of transverse momentum (0.4 < p(T) < 10 GeV/c) and centrality (0-92%) selections for charged hadrons from dijets in Au+Au collisions at root s(NN) = 200 GeV. With increasing p(T), the away-side Delta phi distribution evolves from a broad and relatively flat shape to a concave shape, then to a convex shape. Comparisons with p + p data suggest that the away-side distribution can be divided into a partially suppressed "head" region centered at Delta phi similar to pi, and an enhanced "shoulder" region centered at Delta phi similar to pi +/- 1.1. The p(T) spectrum for the associated hadrons in the head region softens toward central collisions. The spectral slope for the shoulder region is independent of centrality and trigger p(T). The properties of the near-side distributions are also modified relative to those in p + p collisions, reflected by the broadening of the jet shape in Delta phi and Delta eta, and an enhancement of the per-trigger yield. However, these modifications seem to be limited to p(T)less than or similar to 4 GeV/c, above which both the hadron pair shape and per-trigger yield become similar to p + p collisions. These observations suggest that both the away- and near-side distributions contain a jet fragmentation component which dominates for p(T) greater than or similar to 5 GeV/c and a medium-induced component which is important for p(T) less than or similar to 4 GeV/c. We also quantify the role of jets at intermediate and low p(T) through the yield of jet-induced pairs in comparison with binary scaled p + p pair yield. The yield of jet-induced pairs is suppressed at high pair proxy energy (sum of the p(T) magnitudes of the two hadrons) and is enhanced at low pair proxy energy. The former is consistent with jet quenching; the latter is consistent with the enhancement of soft hadron pairs due to transport of lost energy to lower p(T).

Published
2008
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48. Quantitative constraints on the transport properties of hot partonic matter from semi-inclusive single high transverse momentum pion suppression in Au+Au collisions atsNN=200GeV

Author

M. Issah, M. D. Malik, E. Vznuzdaev, A. Hadj Henni, K. Boyle, Wei Xie, L. Aphecetche, Johannes Peter Wessels, P. Tarján, Senta Greene, Youngil Kwon, M. Groose Perdekamp, A. V. Kazantsev, H. Kanou, Taku Gunji, H. Gong, J. Seele, B. E. Norman, E. O'Brien, R. A. Soltz, P. Mikeš, F. Kajihara, H. Delagrange, Yoichiro Fukao, K. Das, J. Chiba, T. C. Awes, T. Liška, Jun Kikuchi, E. P. Hartouni, Y. L. Yamaguchi, H. Pei, G. C. Mishra, Tadaaki Isobe, J. S. Chai, S. Zhou, B. Komkov, Takao Sakaguchi, C. Klein-Boesing, M. Rosati, M. Gonin, P. L. McGaughey, Norio Saito, M. A. L. Leite, A. D. Frawley, T. Tabaru, S. Afanasiev, A. Ster, Y. S. Kim, D. Winter, S. H. Aronson, D. Yu Peressounko, M. Chiu, T. A. Shibata, H. Pereira, A. A. Vinogradov, Henrik Tydesjö, J. M. Burward-Hoy, W. Holzmann, Maya Hachiya Shimomura, Y. I. Makdisi, D. Hornback, Jiangyong Jia, Y. Goto, A. Kiss, Z. Yasin, Henner Buesching, C. L. Woody, R. S. Towell, J. G. Boissevain, M. Naglis, M. Heffner, V. Babintsev, Minghui Liu, C. L. Silva, Masashi Kaneta, I. Garishvili, Akio Kiyomichi, M. J. Tannenbaum, G. S. Kyle, A. Taranenko, D. Isenhower, J. L. Drachenberg, I. Ravinovich, N. Willis, James Alexander, A. Toia, Masayasu Ishihara, N. Kurihara, M. B. Deaton, C. Pinkenburg, W. C. Smith, L. Mašek, D. Mukhopadhyay, Kazushi Miki, S. Rembeczki, Marcus Hohlmann, R. Greiner De Cassagnac, S. P. Sorensen, Susumu Sato, Dylan Walker, H. A. Gustafsson, D. Bucher, R. Averbeck, Byung-Sik Hong, A. Bazilevsky, M. Stepanov, G. Roche, Y. J. Mao, Y. Tanaka, Kenneth Francis Read, J. L. Charvet, Philippe Rosnet, M. G. Hur, C. Y. Chi, S. Kametani, D. Kawall, C. Zhang, T. L. Thomas, T. K. Shea, Anne Marie Sickles, Alexandre Lebedev, K. Tanida, M. K. Lee, K. Ozawa, J. H. Kang, S. Bathe, V. I. Kochetkov, Y. Nagata, J. G. Lajoie, D. M. Lee, K. Hasuko, T. E. Miller, E. T. Atomssa, Agneta Oskarsson, T. Hachiya, J. S. Haggerty, A. Romana, C. P. Singh, J. Murata, Viktor Riabov, B. M. Johnson, L. Tomášek, Y. Berdnikov, Gerd Joachim Kunde, G. R. Young, P. Chung, I. J. Choi, J. Imrek, A. Kravitz, Hiroyuki Okada, Hiroaki Ohnishi, S. Batsouli, Y. Akiba, A. Isupov, C. Suire, V. S. Pantuev, I. Shein, M. Holmes, M. Mishra, S. Nagamiya, Joakim Nystrand, Kazuhiro Tanaka, Ryugo S. Hayano, J. Sziklai, M. Harvey, W. S. Emam, E. H. Kim, F. Staley, L. Baksay, Brian Cole, Eva Haslum, B. Lenzi, S. S. Ryu, Jan Rak, Vaclav Vrba, O. Dietzsch, H. Valle, Klaus Johannes Reygers, Y. S. Lai, T. Ichihara, Alberto Baldisseri, A. Deshpande, M. C. McCain, Junji Tojo, Y. Riabov, Matthew G. Reuter, J. Gosset, Charles Maguire, A. Adare, Saskia Mioduszewski, S. Leckey, A. P.T. Palounek, Takahiro Fusayasu, J. P. Sullivan, K. O. Eyser, K. Fujiwara, I. D. Ojha, Alexander Malakhov, K. Okada, S. Esumi, B. Sahlmueller, Kenta Shigaki, Josh Moss, M. Nguyen, D. Silvermyr, H. En'yo, W. A. Zajc, Xingguo Li, P. Constantin, M. J. Leitch, I. Younus, E. Kistenev, Julia Velkovska, L. S. Zolin, W. J. Park, V. Baublis, A. Denisov, V. Cianciolo, M. Mitrovski, J. Jin, E. M. Takagui, Mate Csanad, A. Soldatov, Sergey Fokin, P. D. Barnes, A. Yanovich, H. W. Van Hecke, R. Bennett, T. Horaguchi, H. Harada, S. N. White, Tae-Yeon Lee, K. S. Sim, Y. Watanabe, Xiao-yan Li, A. S. Nyanin, K. Nakano, S. Yokkaichi, J. M. Heuser, W. E. Sondheim, M. Wysocki, P. A. Rukoyatkin, S. Y. Fung, Martin Purschke, Ahmed Al-Jamel, F. Gastineau, John Hill, H. A. Torii, Toru Sugitate, L. D. Isenhower, E. J. Desmond, F. Matathias, M. Finger, Kensuke Homma, David D'Enterria, François Fleuret, B. Forestier, J. E. Frantz, M. Togawa, H. Hiejima, Robert F. Hobbs, S. Chernichenko, J. Park, H. Lim, Florian Bauer, B. Bassalleck, R. P. Pisani, M. Konno, D. Kotchetkov, Y. Tsuchimoto, Y. Nakamiya, Debashish Pal, G. Baksay, K. Imai, A. Morreale, Nikolay Tyurin, S. Sawada, M. T. Bjorndal, I. E. Yushmanov, Herve Borel, D. Lynch, J. Ying, A. Franz, Z. Fraenkel, M. N. Wagner, R. Vértesi, J. T. Mitchell, A. Glenn, A. Shevel, S. Butsyk, R. Seidl, B. Espagnon, Vladislav Manko, X. He, M. Slunečka, T. Hester, S. F. Pate, Vladimir Samsonov, B. Azmoun, A. Král, M. J. Kweon, I. Otterlund, O. O. Omiwade, V. L. Rykov, T. Dahms, Jason Newby, H. Al-Bataineh, X. R. Wang, Y. Le Bornec, C. Vale, B. S. Chang, Christine Angela Aidala, J. Klay, V-N. Tram, Tamas Ferenc Csorgo, Alexei Khanzadeev, E. Stenlund, O. Zaudtke, I. V. Sourikova, J. L. Nagle, H. Sakata, Motoi Inaba, V. Papavassiliou, M. Oka, Sébastien Gadrat, V. Peresedov, M. Virius, A. Dion, C. Silvestre, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Andry Malala Rakotozafindrabe, T. V. Moukhanova, M. Ouchida, Atsushi Taketani, A. Enokizono, Y. Cobigo, S. Belikov, K. S. Joo, J. Asai, Shingo Sakai, Roy A. Lacey, Rushan Han, M. N. Hagiwara, D. Sharma, H. Masui, A. K. Dubey, A. A. Bickley, S. Takagi, K. N. Barish, D. E. Fields, B. V. Jacak, M. McCumber, A. K. Purwar, M. L. Brooks, S. Kelly, Alexander Milov, N. N. Ajitanand, I. Nakagawa, B. Love, O. Drapier, Frank Ellinghaus, Takahiro Nakamura, Marie Germain, Susumu Oda, E. R. Kinney, T. Shohjoh, A. Durum, D. P. Morrison, S. Campbell, D. S. Brown, V. E. Semenov, A. G. Litvinenko, J. Zimányi, Tatsuya Chujo, I. Tserruya, Yu. Efremenko, V. Singh, Hirohiko Sato, S. K. Tuli, K. Dehmelt, Jen-Chieh Peng, Dong Jo Kim, Osamu Jinnouchi, A. Kozlov, R. Seto, K. Haruna, V. Dzhordzhadze, R. Pak, N. Kamihara, R. Armendariz, Kazuyoshi Kurita, A. Drees, J. Kubart, J. Egdemir, C. R. Cleven, Jason Kamin, C. Haegemann, Y. Inoue, S. P. Stoll, P. J. Kroon, Dong-Hun Kim, S. S.E. Rosendahl, G. Bunce, Steven E. Skutnik, A. Churyn, D. Jouan, H. Qu, Hideki Hamagaki, K. Aoki, G. David, C. A. Ogilvie, T. K. Hemmick, Yasuo Miake, N. Grau, K. Shoji, L. Kochenda, P. W. Stankus, and T. Kawagishi

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Opacity, 010308 nuclear & particles physics, Transport coefficient, Charge density, Parton, 01 natural sciences, Standard deviation, Nuclear physics, Pion, 0103 physical sciences, Transverse momentum, Nuclear Experiment, 010306 general physics
Abstract

The PHENIX experiment has measured the suppression of semi-inclusive single high-transverse-momentum pi(0)'s in Au+Au collisions at root s(NN) = 200 GeV. The present understanding of this suppression is in terms of energy loss of the parent (fragmenting) parton in a dense color-charge medium. We have performed a quantitative comparison between various parton energy-loss models and our experimental data. The statistical point-to-point uncorrelated as well as correlated systematic uncertainties are taken into account in the comparison. We detail this methodology and the resulting constraint on the model parameters, such as the initial color-charge density dN(g)/dy, the medium transport coefficient , or the initial energy-loss parameter epsilon(0). We find that high-transverse-momentum pi(0) suppression in Au+Au collisions has sufficient precision to constrain these model-dependent parameters at the +/- 20-25% (one standard deviation) level. These constraints include only the experimental uncertainties, and further studies are needed to compute the corresponding theoretical uncertainties.

Published
2008
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49. Source Breakup Dynamics inAu+AuCollisions atsNN=200 GeVvia Three-Dimensional Two-Pion Source Imaging

Author

K. Boyle, Wei Xie, I. Ravinovich, M. Rosati, Mate Csanad, Steven E. Skutnik, R. Vértesi, A. Kiss, Robert F. Hobbs, E. H. Kim, Henner Buesching, C. L. Woody, K. S. Sim, I. Tserruya, Marie Germain, Bruno Espagnon, A. A. Vinogradov, Henrik Tydesjö, R. S. Towell, H. Qu, R. A. Soltz, J. Chiba, Martin Purschke, F. Gastineau, Akio Kiyomichi, Y. Nagata, Hideki Hamagaki, K. Aoki, G. David, Jiangyong Jia, Y. Goto, M. Chiu, Y. Tanaka, T. K. Shea, Y. Watanabe, Yu. Efremenko, V. Singh, T. Ichihara, Matthew G. Reuter, K. Hasuko, A. G. Litvinenko, T. A. Shibata, G. C. Mishra, H. A. Gustafsson, N. Kurihara, S. S. Ryu, Youngil Kwon, I. D. Ojha, D. Kotchetkov, Alexander Malakhov, Debashish Pal, M. Grosse Perdekamp, H. Hiejima, David D'Enterria, C. Zhang, Takao Sakaguchi, M. G. Hur, C. Y. Chi, Kensuke Homma, C. R. Cleven, C. Klein-Boesing, S. Sawada, A. Kozlov, D. Silvermyr, M. Naglis, S. Bathe, Agneta Oskarsson, S. Chernichenko, R. Seto, Hiroyuki Okada, C. L. Silva, D. Isenhower, L. S. Zolin, Jason Newby, H. Lim, K. Haruna, R. Bennett, Y. Berdnikov, R. P. Pisani, A. D. Frawley, S. Kelly, P. J. Kroon, T. Tabaru, N. N. Ajitanand, W. J. Park, Y. Akiba, K. Imai, A. Franz, C. P. Singh, V. S. Pantuev, F. Staley, B. Bassalleck, S. Nagamiya, Kazuhiro Tanaka, Joakim Nystrand, B. M. Johnson, Charles Maguire, Ahmed Al-Jamel, V. Dzhordzhadze, Z. Fraenkel, M. Konno, Klaus Johannes Reygers, Nikolay Tyurin, Eva Haslum, M. Harvey, B. Komkov, A. Isupov, S. Leckey, Takahiro Nakamura, O. Dietzsch, Hirohiko Sato, S. K. Tuli, X. He, O. O. Omiwade, K. Das, J. E. Frantz, N. Grau, Jan Rak, M. N. Wagner, P. D. Barnes, A. Yanovich, Junji Tojo, Viktor Riabov, J. Sziklai, K. Shoji, Taku Gunji, J. T. Mitchell, H. Valle, Josh Moss, Masayasu Ishihara, E. P. Hartouni, E. J. Desmond, S. H. Aronson, Brian Cole, Norio Saito, M. A. L. Leite, V. Peresedov, T. Shohjoh, A. Durum, S. N. White, Vladislav Manko, R. Granier de Cassagnac, F. Kajihara, Jen-Chieh Peng, K. Okada, M. Togawa, E. Kistenev, Julia Velkovska, Herve Borel, Susumu Sato, P. W. Stankus, J. Park, S. Afanasiev, B. Sahlmueller, H. En'yo, Saskia Mioduszewski, H. Delagrange, P. Constantin, D. S. Brown, W. Holzmann, S. Batsouli, A. Glenn, M. Gonin, Florian Bauer, A. Ster, M. J. Leitch, D. Winter, D. Yu Peressounko, S. Belikov, K. S. Joo, Maya Hachiya Shimomura, P. Tarján, J. M. Burward-Hoy, H. Masui, A. K. Dubey, V. Babintsev, V. L. Rykov, T. Dahms, D. E. Fields, H. Harada, H. W. Van Hecke, K. Tanida, J. Jin, G. S. Kyle, Y. I. Makdisi, Y. Tsuchimoto, B. V. Jacak, H. Pei, V. I. Kochetkov, Dong Jo Kim, E. M. Takagui, S. Takagi, N. Willis, James Alexander, M. C. McCain, W. E. Sondheim, Osamu Jinnouchi, H. Pereira, N. Kamihara, Y. S. Kim, V-N. Tram, W. C. Smith, K. N. Barish, R. Averbeck, O. Zaudtke, I. E. Yushmanov, A. K. Purwar, F. Matathias, J. Murata, Byung-Sik Hong, R. Armendariz, A. Bazilevsky, M. Wysocki, A. P.T. Palounek, M. K. Lee, K. Ozawa, Kazuyoshi Kurita, P. A. Rukoyatkin, M. Heffner, S. Y. Fung, C. Vale, Gerd Joachim Kunde, Philippe Rosnet, Alexei Khanzadeev, Motoi Inaba, A. Drees, J. L. Drachenberg, Christophe Pierre Suire, Alexander Milov, Senta Greene, T. E. Miller, Christine Angela Aidala, A. Taranenko, A. Enokizono, S. Esumi, S. P. Sorensen, E. Stenlund, M. J. Tannenbaum, Alexandre Lebedev, D. M. Lee, I. Shein, O. Drapier, D. Sharma, B. E. Norman, P. Chung, John Hill, W. A. Zajc, Y. Cobigo, M. Holmes, E. R. Kinney, D. P. Morrison, E. O'Brien, H. A. Torii, Alberto Baldisseri, A. Deshpande, M. L. Brooks, Anne Marie Sickles, S. F. Pate, V. Baublis, S. Campbell, B. Azmoun, Toru Sugitate, D. Mukhopadhyay, L. D. Isenhower, A. Denisov, V. Cianciolo, C. A. Ogilvie, V. E. Semenov, J. Zimányi, D. Bucher, M. J. Kweon, Sergey Fokin, T. K. Hemmick, Tatsuya Chujo, Yasuo Miake, J. G. Lajoie, T. Hachiya, M. T. Bjorndal, Y. Le Bornec, T. V. Moukhanova, François Fleuret, B. Forestier, X. R. Wang, T. Horaguchi, L. Kochenda, I. J. Choi, Hiroaki Ohnishi, T. Kawagishi, J. Egdemir, I. Younus, S. P. Stoll, V. Papavassiliou, Sébastien Gadrat, S. S.E. Rosendahl, G. Bunce, G. R. Young, D. Jouan, A. Soldatov, Xingguo Li, A. Dion, Atsushi Taketani, T. L. Thomas, Ryugo S. Hayano, Y. Riabov, Kenta Shigaki, M. Nguyen, A. S. Nyanin, I. V. Sourikova, Shingo Sakai, S. Kametani, J. H. Kang, J. S. Haggerty, A. Romana, M. Issah, M. D. Malik, E. Vznuzdaev, L. Aphecetche, J. G. Boissevain, Masashi Kaneta, Johannes Peter Wessels, C. Pinkenburg, M. Stepanov, G. Roche, J. Gosset, J. P. Sullivan, S. Yokkaichi, J. M. Heuser, Tadaaki Isobe, S. Butsyk, J. S. Chai, Vladimir Samsonov, P. L. McGaughey, I. Otterlund, A. V. Kazantsev, Yoichiro Fukao, T. C. Awes, Tamas Ferenc Csorgo, Minghui Liu, J. L. Nagle, Kenneth Francis Read, V. Bumazhnov, M. P. Comets, Roy A. Lacey, M. N. Hagiwara, and A. Hadj Henni

Subjects
Source function, Physics, Range (particle radiation), 010308 nuclear & particles physics, Dynamics (mechanics), General Physics and Astronomy, Breakup, 01 natural sciences, Nuclear physics, Correlation function (statistical mechanics), Pion, 0103 physical sciences, Transverse momentum, Atomic physics, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract

A three-dimensional correlation function obtained from midrapidity, low p(T), pion pairs in central Au+Au collisions at root s(NN) = 200 GeV is studied. The extracted model-independent source function indicates a long range tail in the directions of the pion pair transverse momentum (out) and the beam (long). A proper breakup time tau(0) similar to 9 fm/c and a mean proper emission duration Delta tau similar to 2 fm/c, leading to sizable emission time differences ( approximate to 12 fm/c), are required to allow models to be successfully matched to these tails. The model comparisons also suggest an outside-in "burning" of the emission source reminiscent of many hydrodynamical models.

Published
2008
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50. Cold nuclear matter effects onJ/ψproduction as constrained by deuteron-gold measurements atsNN=200GeV

Author

V. I. Kochetkov, B. Khachaturov, S. C. Johnson, T. Matsumoto, J. Murata, B. Azmoun, A. Král, M. J. Kweon, K. Hasuko, M. Gonin, A. Shevel, Gerd Joachim Kunde, T. L. Thomas, V.N. Penev, T. Hester, Hiroyuki Okada, Y. Le Bornec, S. Esumi, Joakim Nystrand, Eva Haslum, B. Lenzi, M. Oka, I. Shein, R. A. Soltz, H. Borel, J. E. Frantz, C. H. Kuberg, J. Chiba, J. Gosset, J. P. Sullivan, H. Pereira, A. Dion, Ryugo S. Hayano, M. Grosse Perdekamp, J. M. Burward-Hoy, J. L. Charvet, Tae-Yeon Lee, Martin Purschke, W. A. Zajc, D. Kotchetkov, V-N. Tram, G. C. Mishra, A. Morreale, Z. Fraenkel, Atsushi Taketani, A. Enokizono, Y. Riabov, R. K. Choudhury, Kenta Shigaki, D. Lynch, M. Nguyen, A. Pierson, V. Baublis, K. S. Joo, A. Deshpande, L. Sanfratello, M. B. Deaton, A. Denisov, S. Afanasiev, A. Ster, E. H. Kim, A. S. Nyanin, M. K. Lee, K. Ozawa, T. E. Miller, E. T. Atomssa, Hiroaki Ohnishi, V. Cianciolo, Motoi Inaba, A. Glenn, D. Sharma, Takao Sakaguchi, C. Klein-Boesing, Minghui Liu, B. D. Fox, R. Santo, David Olle Rickard Silvermyr, Sergey Fokin, L. Tomášek, Mate Csanad, V. S. Pantuev, J. M. Qualls, P. Chung, A. D. Frawley, S. Butsyk, X. He, M. Harvey, O. O. Omiwade, Kenneth Francis Read, Y. Tanaka, Vladimir Samsonov, T. Horaguchi, I. Otterlund, Junji Tojo, T. Tabaru, A. Hoover, V. L. Rykov, T. Dahms, S. Yokkaichi, Youngil Kwon, I. Younus, J. M. Heuser, D. Winter, K. Okada, V. Peresedov, E. J. Desmond, D. Yu Peressounko, T. K. Shea, W. S. Emam, Jean-Pierre Cussonneau, B. Sahlmueller, H. En'yo, David D'Enterria, S. H. Aronson, S. Batsouli, P. Constantin, M. J. Leitch, R. S. Towell, H. Kanou, A. Devismes, Taku Gunji, H. Gong, J. Seele, D. Kawall, I. Ravinovich, M. Togawa, L. Aphecetche, Takeo Kawabata, M. C. McCain, J. Park, A. Soldatov, Y. J. Mao, P. Tarján, Sean A. Kelly, R. P. Pisani, F. Kajihara, A. V. Kazantsev, S. Kametani, W. Holzmann, Florian Bauer, D. Hornback, I. Garishvili, Akio Kiyomichi, Nikolay Tyurin, Viktor Veszpremi, Y. Nagata, H. Delagrange, H. Masui, A. K. Dubey, Xingguo Li, D. E. Fields, M. N. Wagner, Pàl Hidas, Anne Marie Sickles, M. Heffner, P. Mikeš, M. Naglis, A. A. Bickley, J. H. Kang, S. Takagi, J. S. Haggerty, C. L. Silva, J. L. Drachenberg, Y. Tsuchimoto, A. Romana, Maya Hachiya Shimomura, A. P.T. Palounek, S. Zhou, S. S. Ryu, N. Kurihara, A. Taranenko, Yoichiro Fukao, Tamas Ferenc Csorgo, K. N. Barish, I. V. Sourikova, H. Torii, B. V. Jacak, A. Baldisseri, I. E. Yushmanov, S. P. Sorensen, Y. I. Makdisi, Dylan Walker, T. C. Awes, T. Liška, Kazushi Miki, Masayasu Ishihara, Susumu Sato, Jun Kikuchi, Senta Greene, Tadaaki Isobe, L. Baksay, M. Muniruzzaman, Alexei Khanzadeev, N. Bruner, E. Stenlund, J. L. Nagle, H. Sakata, H. A. Gustafsson, M. Ouchida, M. Chiu, Ajit Kumar Mohanty, T. J. Uam, C. Y. Chi, F. Staley, T. A. Shibata, G. R. Young, Johannes Peter Wessels, M. J. Tannenbaum, B. E. Norman, R. Bennett, E. O'Brien, C. Zhang, J. Asai, J. G. Lajoie, Charles Maguire, S. Leckey, T. Hachiya, M. L. Brooks, M. McCumber, A. K. Purwar, Xiao-yan Li, V. V. Ikonnikov, Y. S. Lai, Ahmed Al-Jamel, M. Finger, A. G. Hansen, B. Love, Shingo Sakai, I. J. Choi, A. Kravitz, Marie Germain, D. Mukhopadhyay, S. Rembeczki, T. V. Moukhanova, D. Isenhower, Viktor Riabov, Saskia Mioduszewski, O. Zaudtke, Marisilvia Donadelli, V. Bumazhnov, M. P. Comets, Josh Moss, A. G. Litvinenko, A. Toia, L. Mašek, R. Vértesi, German Martinez, D. Bucher, J. G. Boissevain, Masashi Kaneta, Andry Malala Rakotozafindrabe, M. Virius, A. Kozlov, R. Seto, K. Katou, E. Kistenev, K. Haruna, Yves Roland Schutz, Ch. Finck, Jason Newby, K. S. Sim, C. Pinkenburg, Y. L. Yamaguchi, V. Dzhordzhadze, Y. Watanabe, J. Jin, W. C. Chang, H. Harada, E. M. Takagui, Y. Cobigo, M. Stepanov, G. Roche, H. Pei, Roy A. Lacey, M. Issah, B. Komkov, C. P. Singh, N. N. Ajitanand, Rushan Han, B. M. Johnson, Takahiro Nakamura, A. Isupov, C. Suire, H. J. Kim, J. Sziklai, Susumu Oda, Brian Cole, A. Durum, M. D. Malik, H. Hiejima, E. Vznuzdaev, Catherine Micaela Silvestre, D. S. Brown, K. Imai, Norio Saito, M. A. L. Leite, A. Hadj Henni, K. Boyle, Jan Rak, Wei Xie, R. Granier de Cassagnac, A. Adare, V. Babintsev, S. S. Adler, G. S. Kyle, N. Willis, James Alexander, R. Averbeck, Byung-Sik Hong, A. Bazilevsky, Philippe Rosnet, Alexandre Lebedev, D. M. Lee, Xiaopeng Zong, M. Mitrovski, R. Pak, Ferenc Deák, N. Kamihara, M. Wysocki, R. Armendariz, Kazuyoshi Kurita, Robert F. Hobbs, A. Drees, J. Kubart, M. A. Volkov, Debashish Pal, S. Sawada, J. Ying, A. Franz, C. A. Ogilvie, B. Espagnon, T. K. Hemmick, Yasuo Miake, S. F. Pate, L. Kochenda, H. Al-Bataineh, X. R. Wang, C. R. Cleven, C. Haegemann, Y. Inoue, R. Kohara, J. Egdemir, V. Papavassiliou, Jason Kamin, Sébastien Gadrat, S. P. Stoll, P. J. Kroon, A. Kiss, S. S.E. Rosendahl, Dong-Hun Kim, G. Bunce, Z. Yasin, Henner Buesching, C. L. Woody, A. Churyn, D. Jouan, P. Chand, Marcus Hohlmann, Steven E. Skutnik, H. Kobayashi, S. Bathe, Agneta Oskarsson, Y. Berdnikov, Y. Akiba, M. Mishra, S. Nagamiya, Kazuhiro Tanaka, Vaclav Vrba, Klaus Johannes Reygers, K. O. Eyser, K. Fujiwara, H. W. Van Hecke, H. Qu, M. Inuzuka, Hideki Hamagaki, K. Aoki, G. David, I. Tserruya, Yu. Efremenko, V. Singh, G. B. Kim, Hirohiko Sato, K. Dehmelt, Jen-Chieh Peng, N. Grau, K. Shoji, Dong Jo Kim, Osamu Jinnouchi, Alexander Milov, I. Nakagawa, P. W. Stankus, O. Drapier, Frank Ellinghaus, E. R. Kinney, D. P. Morrison, S. Campbell, V. E. Semenov, J. Zimányi, Tatsuya Chujo, O. Dietzsch, H. Valle, K. Das, E. P. Hartouni, Dipanwita Dutta, T. Ichihara, Julia Velkovska, F. K. Wohn, M. Rosati, Y. Nakamiya, M. Velkovsky, Matthew G. Reuter, Takahiro Fusayasu, G. Baksay, I. D. Ojha, M. T. Bjorndal, A. A. Vinogradov, Henrik Tydesjö, Alexander Malakhov, Jiangyong Jia, Y. Goto, L. S. Zolin, W. J. Park, P. D. Barnes, A. Yanovich, S. N. White, F. Matathias, Kensuke Homma, K. Nakano, W. E. Sondheim, S. Chernichenko, H. Lim, P. A. Rukoyatkin, S. Y. Fung, B. Bassalleck, John Hill, K. Oyama, Toru Sugitate, L. D. Isenhower, M. Konno, P. L. McGaughey, François Fleuret, J. T. Mitchell, R. Seidl, Vladislav Manko, M. Slunečka, S. Belikov, X. Camard, C. Vale, B. S. Chang, Christine Angela Aidala, J. Klay, and K. Tanida

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Nuclear Theory, Quarkonium, Nuclear matter, Breakup, 7. Clean energy, 01 natural sciences, Baryon, Nuclear physics, 0103 physical sciences, Rapidity, Nuclear Experiment, 010306 general physics, Nucleon
Abstract

We present a new analysis of J/psi production yields in deuteron-gold collisions at root s(NN) =200 GeV using data taken from the PHENIX experiment in 2003 and previously published in S. S. Adler [Phys. Rev. Lett 96, 012304 (2006)]. The high statistics proton-proton J/psi data taken in 2005 are used to improve the baseline measurement and thus construct updated cold nuclear matter modification factors (R-dAu). A suppression of J/psi in cold nuclear matter is observed as one goes forward in rapidity (in the deuteron-going direction), corresponding to a region more sensitive to initial-state low-x gluons in the gold nucleus. The measured nuclear modification factors are compared to theoretical calculations of nuclear shadowing to which a J/psi (or precursor) breakup cross section is added. Breakup cross sections of sigma(breakup)=2.8(-1.4)(+1.7) (2.2(-1.5)(+1.6)) mb are obtained by fitting these calculations to the data using two different models of nuclear shadowing. These breakup cross-section values are consistent within large uncertainties with the 4.2 +/- 0.5 mb determined at lower collision energies. Projecting this range of cold nuclear matter effects to copper-copper and gold-gold collisions reveals that the current constraints are not sufficient to firmly quantify the additional hot nuclear matter effect.

Published
2008
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