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14 results on '"S.E. Vahsen"'

1. Search for CP violation and measurement of branching fractions and decay asymmetry parameters for Λc+→Λh+ and Λc+→Σ0h+ (h=K,π)

Author

L.K. Li, W. Shan, K. Kinoshita, I. Adachi, H. Aihara, D.M. Asner, H. Atmacan, T. Aushev, V. Babu, S. Bahinipati, Sw. Banerjee, P. Behera, J. Bennett, M. Bessner, V. Bhardwaj, B. Bhuyan, T. Bilka, A. Bobrov, D. Bodrov, J. Borah, M. Bračko, P. Branchini, A. Budano, M. Campajola, D. Červenkov, M.-C. Chang, P. Chang, V. Chekelian, A. Chen, B.G. Cheon, K. Chilikin, H.E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, N. Dash, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, Z. Doležal, T.V. Dong, D. Epifanov, T. Ferber, A. Frey, B.G. Fulsom, V. Gaur, A. Garmash, A. Giri, P. Goldenzweig, G. Gong, E. Graziani, T. Gu, Y. Guan, K. Gudkova, C. Hadjivasiliou, K. Hayasaka, H. Hayashii, M.T. Hedges, W.-S. Hou, C.-L. Hsu, K. Inami, A. Ishikawa, R. Itoh, W.W. Jacobs, E.-J. Jang, Q.P. Ji, S. Jia, Y. Jin, K.K. Joo, C. Kiesling, C.H. Kim, D.Y. Kim, K.-H. Kim, P. Kodyš, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Krokovny, T. Kuhr, R. Kumar, K. Kumara, A. Kuzmin, Y.-J. Kwon, Y.-T. Lai, T. Lam, J.S. Lange, S.C. Lee, J. Li, S.X. Li, Y. Li, Y.B. Li, L. Li Gioi, J. Libby, K. Lieret, M. Masuda, S.K. Maurya, M. Merola, F. Metzner, K. Miyabayashi, R. Mizuk, R. Mussa, M. Nakao, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, M. Niiyama, N.K. Nisar, S. Nishida, S. Ogawa, H. Ono, P. Oskin, G. Pakhlova, S. Pardi, H. Park, S.-H. Park, A. Passeri, S. Patra, S. Paul, T.K. Pedlar, R. Pestotnik, L.E. Piilonen, T. Podobnik, E. Prencipe, M.T. Prim, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, Y. Sakai, S. Sandilya, A. Sangal, V. Savinov, G. Schnell, J. Schueler, C. Schwanda, A.J. Schwartz, Y. Seino, K. Senyo, M.E. Sevior, M. Shapkin, C. Sharma, C.P. Shen, J.-G. Shiu, J.B. Singh, A. Sokolov, E. Solovieva, M. Starič, M. Sumihama, K. Sumisawa, T. Sumiyoshi, W. Sutcliffe, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, S. Uno, Y. Usov, S.E. Vahsen, R. van Tonder, G. Varner, A. Vinokurova, A. Vossen, E. Waheed, E. Wang, X.L. Wang, M. Watanabe, S. Watanuki, O. Werbycka, E. Won, X. Xu, B.D. Yabsley, W. Yan, S.B. Yang, J. Yelton, J.H. Yin, Y. Yook, C.Z. Yuan, Z.P. Zhang, V. Zhilich, and V. Zhukova

Subjects
Multidisciplinary
Published
2023
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2. Application of recoil-imaging time projection chambers to directional neutron background measurements in the SuperKEKB accelerator tunnel

Author

J. Schueler, S.E. Vahsen, P.M. Lewis, M.T. Hedges, D. Liventsev, F. Meier, H. Nakayama, A. Natochii, and T.N. Thorpe

Subjects
High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Nuclear Experiment, Instrumentation, High Energy Physics - Experiment
Abstract

Gaseous time projection chambers (TPCs) with high readout segmentation are capable of reconstructing detailed 3D ionization distributions of nuclear recoils resulting from elastic neutron scattering. Using a system of six compact TPCs with pixel ASIC readout, filled with a 70:30 mixture of He:CO$_2$ gas, we analyze the first directional measurements of beam-induced neutron backgrounds in the tunnel regions surrounding the Belle II detector at the SuperKEKB $e^+e^-$ collider. With the use of 3D recoil tracking, we show that these TPCs are capable of maintaining nearly $100\%$ nuclear recoil purity to reconstructed ionization energies ($E_\text{reco}$) as low as 5 $\mathrm{keV_\text{ee}}$. Using a large sample of simulated $^4$He, $^{12}$C, and $^{16}$O recoil tracks, we find consistency between predicted and measured recoil energy spectra in five of the six TPCs, providing useful validation of the neutron production mechanisms modeled in simulation. Restricting this sample to $^4$He recoil tracks with $E_\text{reco}>40$ $\mathrm{keV_\text{ee}}$, we demonstrate axial angular resolutions within $8^{\circ}$ and we introduce a procedure that under suitable conditions, correctly assigns the vector direction to $91\%$ of simulated $^4$He recoils. Applying this procedure to assign vector directions to measured $^4$He recoil tracks, we observe consistency between the angular distributions of observed and simulated recoils, providing first experimental evidence of localized neutron "hotspots" in the accelerator tunnel. Observed rates of nuclear recoils in these TPCs suggest that simulation overestimates the neutron flux from these hotspots., 21 pages, 19 figures. Accepted by Nuclear Instruments & Methods In Physics Research, A

Published
2021

3. First 3D vector tracking of helium recoils for fast neutron measurements at SuperKEKB

Author

M.T. Hedges, S.E. Vahsen, I. Jaegle, P.M. Lewis, H. Nakayama, J. Schueler, and T.N. Thorpe

Subjects
Nuclear and High Energy Physics, High Energy Physics - Experiment (hep-ex), Physics - Instrumentation and Detectors, Physics::Instrumentation and Detectors, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Instrumentation, High Energy Physics - Experiment
Abstract

We present results from the first deployment of novel, high definition, compact gas Time Projection Chambers (TPCs) with pixel chip readout as part of the BEAST II beam background measurement project at SuperKEKB. The TPCs provide detailed 3D imaging of ionization from neutron-induced nuclear recoils in a helium and carbon dioxide target gas mixture at standard temperature and pressure. We find excellent electron background rejection, leading to background-free nuclear recoil measurements above 50 keVee, despite the extreme high-background environment. We measure an angular resolution better than 20{\deg} for recoil tracks longer than 1.7 mm, corresponding to an average ionization energy of ~100 keVee. We also obtain the 3D vector direction of helium recoils by utilizing charge profile measurements along the recoil axis, with a correct head/tail assignment efficiency of approximately 80%. With this performance, we present comparisons between measured and simulated event rates, recoil energy spectra, and directional distributions originating from beam-gas and Touschek beam losses at SuperKEKB. We utilize head/tail recognition to distinguish neutron components travelling with positive radial velocity in the Belle II coordinate system from those with opposite directionality. Finally, we present a novel method of discriminating beam-gas interactions from Touschek beam losses that can eliminate the need for dedicated accelerator runs for background measurements. This method is still statistics-limited. However, future studies should be able to verify this method, which in turn could lead to neutron background analysis runs symbiotic with normal Belle II operation. The capabilities demonstrated here also suggest that high definition recoil imaging in gas TPCs is applicable to low energy, low-background experiments, such as directional dark matter searches.

Published
2021
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4. Measurements of Beam Backgrounds in SuperKEKB Phase 2

Author

Z. Liptak, A. Paladino, L. Santelj, J. Schueler, S. Stefkova, H. Tanigawa, N. Tsuzuki, A. Aloisio, P. Ahlburg, P. Bambade, G. Bassi, M. Barrett, J. Baudot, T.E. Browder, G. Casarosa, G. Cautero, D. Cinabro, G. Claus, D. Cuesta, F. Di Capua, S. Di Carlo, J. Flanagan, A. Frey, B.G. Fulsom, Y. Funakoshi, M. Gabriel, R. Giordano, D. Giuressi, M. Goffe, K. Hara, O. Hartbrich, M.T. Hedges, D. Heuchel, N. Iida, T. Ishibashi, K. Jaaskelainen, D. Jehanno, S. de Jong, T. Kraetzschmar, C. La Licata, L. Lanceri, P. Leitl, P.M. Lewis, C. Marinas, C. Miller, H. Moser, K.R. Nakamura, H. Nakayama, C. Niebuhr, Y. Onuki, C. Pang, B. Paschen, I. Ripp-Baudot, G. Rizzo, J.M. Roney, H. Schreeck, B. Schwenker, F. Simon, M. Specht, B. Spruck, Y. Soloviev, M. Szelezniak, S. Tanaka, S. Terui, G. Tortone, T. Tsuboyama, Y. Uematsu, S.E. Vahsen, L. Vitale, H. Windel, Liptak, Z., Paladino, A., Santelj, L., Schueler, J., Stefkova, S., Tanigawa, H., Tsuzuki, N., Aloisio, A., Ahlburg, P., Bambade, P., Bassi, G., Barrett, M., Baudot, J., Browder, T. E., Casarosa, G., Cautero, G., Cinabro, D., Claus, G., Cuesta, D., Di Capua, F., Di Carlo, S., Flanagan, J., Frey, A., Fulsom, B. G., Funakoshi, Y., Gabriel, M., Giordano, R., Giuressi, D., Goffe, M., Hara, K., Hartbrich, O., Hedges, M. T., Heuchel, D., Iida, N., Ishibashi, T., Jaaskelainen, K., Jehanno, D., de Jong, S., Kraetzschmar, T., La Licata, C., Lanceri, L., Leitl, P., Lewis, P. M., Marinas, C., Miller, C., Moser, H., Nakamura, K. R., Nakayama, H., Niebuhr, C., Onuki, Y., Pang, C., Paschen, B., Ripp-Baudot, I., Rizzo, G., Roney, J. M., Schreeck, H., Schwenker, B., Simon, F., Specht, M., Spruck, B., Soloviev, Y., Szelezniak, M., Tanaka, S., Terui, S., Tortone, G., Tsuboyama, T., Uematsu, Y., Vahsen, S. E., Vitale, L., and Windel, H.

Subjects
Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, FOS: Physical sciences, SuperKEKB, Instrumentation and Detectors (physics.ins-det), Accelerator background, High Energy Physics - Experiment, Beam background, High Energy Physics - Experiment (hep-ex), Belle II, Physics::Accelerator Physics, High Energy Physics::Experiment, Instrumentation
Abstract

The high design luminosity of the SuperKEKB electron-positron collider will result in challenging levels of beam-induced backgro\ unds in the interaction region. Understanding and mitigating these backgrounds is critical to the success of the Belle~II experi\ ment. We report on the first background measurements performed after roll-in of the Belle II detector, a period known as SuperKE\ KB Phase 2, utilizing both the BEAST II system of dedicated background detectors and the Belle II detector itself. We also repor\ t on first revisions to the background simulation made in response to our findings. Backgrounds measured include contributions f\ rom synchrotron radiation, beam-gas, Touschek, and injection backgrounds. At the end of Phase 2, single-beam backgrounds origina\ ting from the 4 GeV positron Low Energy Ring (LER) agree reasonably well with simulation, while backgrounds from the 7 GeV elect\ ron High Energy Ring (HER) are approximately one order of magnitude higher than simulation. We extrapolate these backgrounds for\ ward and conclude it is safe to install the Belle II vertex detector., Comment: 22 Pages, 33 figures

Published
2021
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5. Time projection chambers with integrated pixels and their application to fast neutron detection and dark matter searches

Author

S.E. Vahsen, T.N. Thorpe, K. Beamer, M.T. Hedges, S.J. Ross, J. Yamaoka, I. Jaegle, M. Rosen, and Ihn Sik Seong

Subjects
Physics, Nuclear and High Energy Physics, Pixel, Physics::Instrumentation and Detectors, business.industry, Dark matter, Detector, Alpha particle, Neutron temperature, Nuclear physics, Optics, WIMP, Neutron detection, Projection (set theory), business, Instrumentation
Abstract

We present our most recent work on the use of integrated silicon pixel electronics to read out gas-filled Time Projection Chambers (TPCs). Such detectors have great promise to measure the direction and energy of neutral particles via nuclear recoils that ionize the gas. We report on ongoing studies and refinement of the first prototype constructed at the University of Hawaii. We present data on the detection of alpha particles and fast neutrons using Ar:CO 2 (70:30) and He:CO 2 (70:30) gas, respectively. We also present plans and sensitivity estimates for a future Dark Matter search based on the technology under study.

Published
2013
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6. Measurement of the lepton forward-backward asymmetry inB→Xsℓ+ℓ−decays with a sum of exclusive modes

Author

Z. Q. Liu, R. Gillard, A.E. Bondar, B. G. Cheon, Z. Doležal, X. L. Wang, H. Farhat, H. Sahoo, J. Dalseno, Marko Petrič, H. J. Hyun, M. Z. Wang, K. Kinoshita, U. Tamponi, A. Drutskoy, A. Moll, A. M. Bakich, Y. Iwasaki, E. Ribežl, A. Zupanc, Y. Ushiroda, Z. Natkaniec, T. Iijima, B. Bhuyan, Z. Drásal, Y. J. Kwon, I. Adachi, H. K. Park, G. Bonvicini, R. Seidl, T. E. Browder, E. Kato, Y. Yamashita, Y. S. Sohn, J. Klucar, J. Haba, O. Schneider, S. Korpar, Y. Teramoto, K. Trabelsi, Andrey Sokolov, Kevin Varvell, T. Kuhr, A. Garmash, O. Nitoh, C. P. Shen, P. Krokovny, J. H. Kang, D. Červenkov, D. M. Asner, Y. Sakai, H. Aihara, V. Savinov, V. Bhardwaj, K. Cho, H. Kawai, J. B. Kim, Y. Usov, V.M. Aulchenko, Yueh-Feng Liu, James E. Fast, Yongsun Kim, A. J. Schwartz, B.A. Shwartz, J. Libby, X. H. He, E. Won, S. Uno, Y. Yook, C. Schwanda, T. Kawasaki, I. Jaegle, S. Nishida, J. Yamaoka, Z. P. Zhang, T. Aushev, B. R. Ko, R. Mussa, K. Dutta, K. Adamczyk, G. B. Mohanty, G. Tatishvili, M. J. Kim, H. Hayashii, Y. Watanabe, A. Ishikawa, H. Yamamoto, M. Starič, Vladimir Zhulanov, T. K. Pedlar, Yukinori Sato, J. G. Shiu, Phillip Urquijo, M. Ritter, P. Križan, C. Liu, E. Solovieva, V. Chekelian, M. E. Sevior, T. Saito, T. Peng, T. Ferber, A.L. Sibidanov, T. Kumita, M. Bračko, A. Abdesselam, D. Santel, V. Gaur, T. Iwashita, M. Nakao, V.N. Zhilich, Y. Kato, P. Pakhlov, P. Vanhoefer, D. Semmler, Peter Kodys, H. J. Kim, D. Cinabro, T. Sumiyoshi, M. Uchida, S.E. Vahsen, Sang Hoon Lee, G. Schnell, H. Park, K. Senyo, A. Bozek, A. Chen, Frank Simon, H. Kichimi, T. Sanuki, Samo Stanič, L. E. Piilonen, Mikhail Danilov, M. Shapkin, V. Chobanova, M. Nayak, D. Liventsev, Jung-Hyun Kim, M. Röhrken, E. Nedelkovska, R. Mizuk, W. S. Hou, S. Yashchenko, Yang Li, T. Julius, Y. Choi, R. Pestotnik, V. Vorobyev, C. Van Hulse, N. K. Nisar, T. Hara, L. Santelj, G. S. Varner, B. Golob, R. Itoh, Y. M. Goh, A. Rostomyan, P. Wang, I. S. Cho, C. H. Wang, D. Dutta, Y. Unno, R. Ayad, T. A. Shibata, H. Miyata, Y. Hoshi, S.I. Eidelman, S. Uehara, D. Y. Kim, K. Hayasaka, T. Uglov, A. Kuzmin, S. Ogawa, S. Sandilya, A. Bala, and P.A. Lukin

Subjects
Physics, Particle physics, Muon, 010308 nuclear & particles physics, media_common.quotation_subject, Hadron, Electroweak interaction, 01 natural sciences, Asymmetry, Standard Model, Nuclear physics, KEKB, 0103 physical sciences, High Energy Physics::Experiment, Invariant mass, 010306 general physics, Lepton, media_common
Abstract

We report the first measurement of the lepton forward-backward asymmetry AFB as a function of the squared four-momentum of the dilepton system, q2, for the electroweak penguin process B→Xs+- with a sum of exclusive final states, where is an electron or a muon and Xs is a hadronic recoil system with an s quark. The results are based on a data sample containing 772×106 BB¯ pairs recorded at the (4S) resonance with the Belle detector at the KEKB e+e- collider. AFB for the inclusive B→Xs+- is extrapolated from the sum of 10 exclusive Xs states whose invariant mass is less than 2 GeV/c2. For q2>10.2 GeV2/c2, AFB

Published
2016
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7. First Observation ofCPViolation inB¯0→DCP(*)h0Decays by a Combined Time-Dependent Analysis ofBABARand Belle Data

Author

P. Lukin, B. R. Ko, J. L. Ritchie, S. I. Serednyakov, G. Schnell, T. Iijima, R. Y. So, B. N. Ratcliff, T. K. Pedlar, Maria Roberta Monge, J. A. McKenna, Mauro Morandin, E. Paoloni, R. Andreassen, T. Kuhr, Andrey Sokolov, V. Bhardwaj, R. F. Schwitters, M. Sumihama, C. H. Chen, S. M. Spanier, A. Adametz, P. Taras, M. Gaspero, O. Seon, Frank Simon, Vladimir Blinov, J. P. Coleman, T. Sumiyoshi, M. J. Lee, J. Dalseno, K. T. Kim, R. Sacco, C. Bünger, V. Prasad, M. Ebert, U. Uwer, R. Gillard, T. S. Mattison, James E. Fast, T. Sanuki, Matteo Rama, James G. Smith, S. Prell, S. K. Choi, L. E. Piilonen, James H Cochran, V. Poireau, Maurizio Biasini, R. Godang, A. Jawahery, L. Pesántez, S. Ogawa, Douglas Wright, I. M. Peruzzi, D. Getzkow, G. Pakhlova, V. P. Druzhinin, E. Solovieva, A. M. Rossi, T. Hara, N. Tasneem, T. M. Hong, K. Sumisawa, P. C. Bloom, Roger Barlow, Martino Margoni, G. Cibinetto, S. Uno, J. G. Shiu, S. Al Said, C. Hast, D. J. Lange, G. Piredda, G. De Nardo, G. Bonvicini, R. Faccini, F. Ferrarotto, A. J. Lankford, F. Le Diberder, J. D. Richman, B. Malaescu, F. Bianchi, P. Pakhlov, K. M. Williams, A. Chen, R. Cenci, Aidan Randle-Conde, W. S. Hou, B. Hamilton, M. Franco Sevilla, G. R. Bonneaud, Giulia Casarosa, G. Wormser, W. Panduro Vazquez, M. Feindt, A. Vinokurova, M. Röhrken, S. Luitz, S. Dittrich, Joseph Izen, A. Roodman, L. Piemontese, P. Ongmongkolkul, Z. C. Huard, E. Fioravanti, T. Pulliam, Roland Waldi, J. Ocariz, S. Yashchenko, B. Spaan, H. Briand, T. Julius, W. Gradl, J. W. Gary, H. W. Wulsin, A. Drutskoy, Y. Onuki, U. Mallik, T. Schroeder, S. Okuno, E. Ribežl, A. Zallo, M. Hess, S. Nishida, L. Lanceri, R. Chistov, E. Nakano, C. Van Hulse, Owen Rosser Long, A. Seiden, M. Masuda, V. Babu, F. Ferroni, Pu Wang, D. J. Bard, A. Oyanguren, L. Li Gioi, Z. Drásal, Gabriele Simi, C. H. Wang, A.E. Bondar, W. Dunwoodie, H. Park, Yongsun Kim, H. Farhat, Jochen Dingfelder, R. Cheaib, R. C. Field, S. H. Kim, P. Krokovny, E. Gabathuler, W. R. Innes, F. C. Porter, S.E. Vahsen, Timothy Gershon, Rakesh Kumar, A. Bozek, G. A. Cowan, G. Finocchiaro, V. Luth, A. Zupanc, G. Rizzo, W. T. Ford, C. Schwanda, Tim Adye, R. D. Kass, J. A. Ernst, Bruce Schumm, Y. J. Kwon, A. M. Lutz, C. L. Davis, G. B. Mohanty, Paul Fraser Harrison, V.M. Aulchenko, C. Touramanis, Z. P. Zhang, E. L. Barberio, Alberto Lusiani, P. M. Patel, T. Nanut, K. Trabelsi, T. Tsuboyama, W. J. Wisniewski, O. Schneider, K. H. Kang, K. Cho, C. Voß, D. N. Brown, Z. Doležal, M. S. Alam, Stephen Robert Wagner, Christopher West, M. Nayak, V. Vorobyev, F. Anulli, C. P. Shen, D. Su, R. Stroili, R. Mizuk, Y. Yusa, A. Snyder, R. Calabrese, Dipanwita Dutta, Alessandro Gaz, Marcello Rotondo, S. H. Robertson, D. H. Lee, A. P. Onuchin, L. Sun, S. Martellotti, M. Carpinelli, Marcin Chrzaszcz, J. M. LoSecco, M. Fritsch, Elisa Manoni, B. G. Pushpawela, T. Leddig, S. Passaggio, M. Piccolo, B. Pal, H. R. Band, D. Joffe, F. Simonetto, Y. Teramoto, B. G. Cheon, C. Cartaro, Biplab Dey, Y. B. Hsiung, H. H. F. Choi, S. Playfer, R. H. Schindler, X. H. He, L. M. Cremaldi, A.S. Kuzmin, R. Cowan, Herbert Koch, A. Calcaterra, W. S. Lockman, S. Emery, Fergus Wilson, M. Shapkin, M. Z. Wang, K. Kinoshita, U. Tamponi, Andrei Gritsan, A. Rostomyan, K. Yu. Todyshev, Yu. I. Skovpen, Y. Watanabe, Hiroaki Aihara, G. Batignani, I. M. Nugent, M. T. Graham, T. Aushev, V. B. Golubev, J. Yamaoka, J. Chauveau, F. De Mori, A. Moll, Marko Petrič, T. Uglov, E. P. Solodov, Adrian John Bevan, Dmytro Kovalskyi, K. Chilikin, M. R. Convery, K. Griessinger, V. Chekelian, B. Oberhof, P. Lewis, F. Di Lodovico, T. S. Miyashita, D. S. Chao, Heiko Lacker, J. P. Lees, A. Garmash, A. Palano, Eleonora Luppi, I. Adachi, G. J. King, M. J. Lewczuk, C. C. Zhang, Alessandro Pilloni, Denis Bernard, D. J. Payne, M. Davier, Vladimir Zhulanov, K. Arinstein, T. Ferber, R. Itoh, Brian Meadows, C. Z. Yuan, T. A. Shibata, H. Miyata, E. Ben-Haim, M. E. Sevior, I. S. Lee, E. A. Kravchenko, D. Cinabro, N. K. Nisar, L. Santelj, D. R. Peimer, P. Goldenzweig, D. G. Hitlin, Peter S. Kim, H. A. Neal, J. Dorfan, P. Roudeau, S.I. Eidelman, V.E. Shebalin, David Hutchcroft, K. R. Schubert, I. Jaegle, W. Ostrowicz, X. C. Lou, Jyoti Prakash Biswal, Crisostomo Sciacca, D. Aston, M. Starič, F. Palombo, B. Bhuyan, J. Va’vra, S. Korpar, Y. S. Sohn, R. Contri, K. K. Joo, C. Hearty, Y. Sakai, D. Matvienko, G. Inguglia, E. Won, J. B. Kim, A. M. Bakich, Sw. Banerjee, V. Santoro, Y. M. Goh, B. G. Fulsom, Yuki Sato, K. Hayasaka, D. Gamba, Nicola Neri, T. E. Browder, D. W. G. S. Leith, D. J. Summers, P. Chang, H. Nakazawa, P. Patteri, R. Pestotnik, D. M. Asner, M. Verderi, Ph Leruste, S. Sandilya, A. Abdesselam, M. Bomben, R. J. Sobie, N. Arnaud, A. R. Buzykaev, L. Vitale, A. Bobrov, N. Guttman, F. Martinez-Vidal, J. Haba, Dominik Müller, N. Gabyshev, D. Červenkov, A. Beaulieu, V. Gaur, A. J. Schwartz, B. Stugu, Hitoshi Yamamoto, Jung-Hyun Kim, G. Calderini, H. Ahmed, Yoshinobu Unno, K. Senyo, V. Savinov, E. Grauges, P. Vanhoefer, J. M. Roney, G. Lynch, D. Bettoni, B. Echenard, M. K. Sullivan, A. G. Denig, Corrado Angelini, Stephen Sekula, Mario Giorgi, C. Kiesling, G. Marchiori, Y. Iwasaki, D. Lopes Pegna, I. Garzia, A. Khan, Y. B. Pan, R. Kowalewski, Thomas Latham, C. Patrignani, V. Tisserand, M. Bračko, C. Bozzi, S. Bettarini, J. J. Walsh, Sridhara Dasu, Peter Kodys, K. Honscheid, George Lafferty, E. O. Olaiya, J. Libby, B. Golob, Florian Urs Bernlochner, T. Lueck, R. Glattauer, A. Stocchi, G. P. Dubois-Felsmann, James D. Olsen, H. K. Moon, R. Ayad, M. Posocco, Yu. G. Kolomensky, L. T. Kerth, M. Bellis, V.N. Zhilich, Colin Jessop, R. Prepost, Denis Derkach, H. Hayashii, Oliver Grünberg, F. Forti, Y. Usov, A. J.S. Smith, K. Miyabayashi, Seema Bahinipati, James R. Wilson, I. Badhrees, R. Mussa, G. Vasseur, Simon Akar, G. Onorato, A. Ishikawa, A. Filippi, K. T. Flood, M. Nakao, C. W. Park, P. Križan, G. Raven, M. D. Sokoloff, P. R. Burchat, D. Y. Kim, R. Gorodeisky, M. Simard, D. A. Roberts, G. Grosdidier, A. Hafner, E. M. T. Puccio, G. Eigen, D. B. MacFarlane, A. M. Eisner, M. V. Purohit, J. Albert, T. Kawasaki, M. Uchida, V. Chobanova, J. R. Fry, C. H. Cheng, G. S. Varner, R. de Sangro, S. L. Wu, W. H. Toki, M. N. Wagner, and Abner Soffer

Subjects
Physics, Particle physics, Meson, 010308 nuclear & particles physics, media_common.quotation_subject, Hadron, General Physics and Astronomy, 01 natural sciences, Omega, Asymmetry, B-factory, Nuclear physics, KEKB, 0103 physical sciences, D meson, CP violation, 010306 general physics, media_common
Abstract

We report a measurement of the time-dependent CP asymmetry of B0->D(*)CP h0 decays, where the light neutral hadron h0 is a pi0, eta or omega meson, and the neutral D meson is reconstructed in the CP eigenstates K+ K-, K0S pi0 or K0S omega. The measurement is performed combining the final data samples collected at the Y(4S) resonance by the BaBar and Belle experiments at the asymmetric-energy B factories PEP-II at SLAC and KEKB at KEK, respectively. The data samples contain ( 471 +/- 3 ) x 10^6 BB pairs recorded by the BaBar detector and ( 772 +/- 11 ) x 10^6, BB pairs recorded by the Belle detector. We measure the CP asymmetry parameters -eta_f S = +0.66 +/- 0.10 (stat.) +/- 0.06 (syst.) and C = -0.02 +/- 0.07 (stat.) +/- 0.03 (syst.). These results correspond to the first observation of CP violation in B0->D(*)CP h0 decays. The hypothesis of no mixing-induced CP violation is excluded in these decays at the level of 5.4 standard deviations.

Published
2015
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8. Measurement of χ2 production in two-photon collisions

Author

K. Abe, R. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A.M. Bakich, Y. Ban, E. Banas, A. Bay, P.K. Behera, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, B.C.K. Casey, P. Chang, Y. Chao, B.G. Cheon, R. Chistov, S.-K. Choi, Y. Choi, M. Danilov, L.Y. Dong, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, C. Fukunaga, N. Gabyshev, A. Garmash, T. Gershon, R. Guo, F. Handa, T. Hara, Y. Harada, H. Hayashii, M. Hazumi, E.M. Heenan, I. Higuchi, T. Hojo, T. Hokuue, Y. Hoshi, K. Hoshina, S.R. Hou, W.-S. Hou, H.-C. Huang, T. Igaki, Y. Igarashi, K. Inami, A. Ishikawa, R. Itoh, M. Iwamoto, H. Iwasaki, Y. Iwasaki, H.K. Jang, J. Kaneko, J.H. Kang, J.S. Kang, P. Kapusta, S.U. Kataoka, N. Katayama, H. Kawai, Y. Kawakami, N. Kawamura, T. Kawasaki, H. Kichimi, D.W. Kim, Heejong Kim, H.J. Kim, H.O. Kim, Hyunwoo Kim, S.K. Kim, T.H. Kim, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y.-J. Kwon, G. Leder, S.H. Lee, J. Li, D. Liventsev, R.-S. Lu, J. MacNaughton, G. Majumder, F. Mandl, S. Matsumoto, T. Matsumoto, K. Miyabayashi, H. Miyake, H. Miyata, G.R. Moloney, T. Mori, T. Nagamine, Y. Nagasaka, E. Nakano, M. Nakao, J.W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, F. Ohno, T. Ohshima, T. Okabe, S. Okuno, S.L. Olsen, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C.W. Park, H. Park, K.S. Park, L.S. Peak, J.-P. Perroud, M. Peters, L.E. Piilonen, N. Root, K. Rybicki, H. Sagawa, S. Saitoh, Y. Sakai, M. Satapathy, O. Schneider, S. Schrenk, C. Schwanda, S. Semenov, K. Senyo, R. Seuster, M.E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J.B. Singh, S. Stanič, M. Starič, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S.K. Swain, T. Takahashi, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, G.N. Taylor, Y. Teramoto, S. Tokuda, T. Tomura, S.N. Tovey, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, S. Uno, S.E. Vahsen, G. Varner, K.E. Varvell, C.C. Wang, C.H. Wang, J.G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B.D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, H. Yanai, J. Yashima, Y. Yuan, Y. Yusa, J. Zhang, Z.P. Zhang, V. Zhilich, and D. Žontar

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, KEKB, Branching fraction, Product (mathematics), High Energy Physics::Experiment, Production (computer science), High Energy Physics - Experiment
Abstract

The production of the \chi_{c2} charmonium state in two-photon collisions has been measured with the Belle detector at the KEKB e^+e^- collider. A clear signal for \chi_{c2} --> \gamma J/\psi, J/\psi --> l^+l^- is observed in a 32.6fb^{-1} data sample accumulated at center-of-mass energies near 10.6GeV, and the product of its two-photon decay width and branching fraction is determined to be \Gamma_{\gamma\gamma}(\chi_{c2})B(\chi_{c2} --> \gamma J/\psi) B(J/\psi --> l^+l^-)= 13.5 +/- 1.3(stat.) +/- 1.1(syst.)eV., Comment: 16 pages, 5 figures, to be submitted to Phys. Lett. B

Published
2002
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9. Determination of |V| using the semileptonic decay →De

Author

K. Abe, R. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A.M. Bakich, Y. Ban, E. Banas, S. Behari, P.K. Behera, A. Bondar, A. Bozek, T.E. Browder, B.C.K. Casey, P. Chang, Y. Chao, B.G. Cheon, R. Chistov, S.-K. Choi, Y. Choi, L.Y. Dong, A. Drutskoy, S. Eidelman, V. Eiges, C.W. Everton, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, N. Gabyshev, A. Garmash, T. Gershon, A. Gordon, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N.C. Hastings, H. Hayashii, M. Hazumi, E.M. Heenan, I. Higuchi, T. Higuchi, T. Hojo, T. Hokuue, Y. Hoshi, K. Hoshina, S.R. Hou, W.-S. Hou, S.-C. Hsu, H.-C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, H. Iwasaki, Y. Iwasaki, D.J. Jackson, P. Jalocha, H.K. Jang, J.H. Kang, J.S. Kang, P. Kapusta, N. Katayama, H. Kawai, N. Kawamura, T. Kawasaki, H. Kichimi, D.W. Kim, Heejong Kim, H.J. Kim, H.O. Kim, Hyunwoo Kim, S.K. Kim, T.H. Kim, K. Kinoshita, H. Konishi, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y.-J. Kwon, J.S. Lange, G. Leder, S.H. Lee, D. Liventsev, R.-S. Lu, J. MacNaughton, T. Matsubara, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Miyabayashi, H. Miyake, H. Miyata, G.R. Moloney, S. Mori, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, E. Nakano, M. Nakao, J.W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S.L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C.S. Park, C.W. Park, H. Park, K.S. Park, L.S. Peak, J.-P. Perroud, M. Peters, L.E. Piilonen, E. Prebys, J.L. Rodriguez, N. Root, M. Rozanska, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, S. Schrenk, S. Semenov, K. Senyo, M.E. Sevior, H. Shibuya, B. Shwartz, J.B. Singh, S. Stanič, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, S. Suzuki, S.Y. Suzuki, S.K. Swain, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, Y. Tanaka, G.N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S.N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, S.E. Vahsen, K.E. Varvell, C.C. Wang, C.H. Wang, J.G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B.D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, S. Yanaka, J. Yashima, M. Yokoyama, K. Yoshida, Y. Yuan, Y. Yusa, C.C. Zhang, J. Zhang, H.W. Zhao, Y. Zheng, V. Zhilich, and D. Žontar

Subjects
Nuclear physics, Physics, Semileptonic decay, Nuclear and High Energy Physics, KEKB, Branching fraction, Electron–positron annihilation, Form factor (quantum field theory), Value (computer science), Resonance, Storage ring
Abstract

We present a measurement of the Cabibbo–Kobayashi–Maskawa (CKM) matrix element |Vcb| using a 10.2 fb−1 data sample recorded at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric e+e− storage ring. By extrapolating the differential decay width of the B 0 →D ∗+ e − ν decay to the kinematic limit at which the D ∗+ is at rest with respect to the B 0 , we extract the product of |Vcb| with the normalization of the decay form factor F(1), |Vcb|F(1)=(3.54±0.19±0.18)×10−2, where the first error is statistical and the second is systematic. A value of |Vcb|=(3.88±0.21±0.20±0.19)×10−2 is obtained using a theoretical calculation of F(1), where the third error is due to the theoretical uncertainty in the value of F(1). The branching fraction B ( B 0 →D ∗+ e − ν ) is measured to be (4.59±0.23±0.40)×10−2.

Published
2002
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10. A measurement of the branching fraction for the inclusive B→Xγ decays with the Belle detector

Author

K. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, G. Alimonti, K. Aoki, K. Asai, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A.M. Bakich, E. Banas, W. Bartel, S. Behari, P.K. Behera, D. Beiline, A. Bondar, A. Bozek, T.E. Browder, B.C.K. Casey, P. Chang, Y. Chao, B.G. Cheon, S.-K. Choi, Y. Choi, Y. Doi, J. Dragic, A. Drutskoy, S. Eidelman, Y. Enari, R. Enomoto, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, A. Garmash, A. Gordon, K. Gotow, H. Guler, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, T. Haruyama, N.C. Hastings, K. Hayashi, H. Hayashii, M. Hazumi, E.M. Heenan, Y. Higasino, I. Higuchi, T. Higuchi, H. Hirano, T. Hojo, Y. Hoshi, W.-S. Hou, S.-C. Hsu, H.-C. Huang, S. Ichizawa, Y. Igarashi, T. Iijima, H. Ikeda, K. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, G. Iwai, H. Iwasaki, Y. Iwasaki, D.J. Jackson, P. Jalocha, H.K. Jang, M. Jones, R. Kagan, H. Kakuno, J. Kaneko, J.H. Kang, J.S. Kang, P. Kapusta, N. Katayama, H. Kawai, N. Kawamura, T. Kawasaki, H. Kichimi, D.W. Kim, Heejong Kim, H.J. Kim, Hyunwoo Kim, S.K. Kim, K. Kinoshita, K. Korotushenko, P. Krokovny, R. Kulasiri, S. Kumar, T. Kuniya, E. Kurihara, A. Kuzmin, Y.-J. Kwon, J.S. Lange, M.H. Lee, S.H. Lee, H.B. Li, D. Liventsev, R.-S. Lu, A. Manabe, T. Matsubara, S. Matsui, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Misono, K. Miyabayashi, H. Miyake, H. Miyata, L.C. Moffitt, G.R. Moloney, G.F. Moorhead, S. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, E. Nakano, M. Nakao, J.W. Nam, S. Narita, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, Y. Ohshima, T. Okabe, T. Okazaki, S. Okuno, S.L. Olsen, W. Ostrowicz, H. Ozaki, H. Palka, C.S. Park, C.W. Park, H. Park, L.S. Peak, M. Peters, L.E. Piilonen, E. Prebys, J.L. Rodriguez, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, S. Schrenk, S. Semenov, K. Senyo, M.E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J.B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S.Y. Suzuki, S.K. Swain, H. Tajima, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, Y. Tanaka, G.N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S.N. Tovey, K. Trabelsi, T. Tsuboyama, Y. Tsujita, T. Tsukamoto, S. Uehara, K. Ueno, N. Ujiie, Y. Unno, S. Uno, Y. Ushiroda, Y. Usov, S.E. Vahsen, G. Varner, K.E. Varvell, C.C. Wang, C.H. Wang, M.-Z. Wang, T.J. Wang, Y. Watanabe, E. Won, B.D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, H. Yamaoka, Y. Yamaoka, Y. Yamashita, M. Yamauchi, S. Yanaka, M. Yokoyama, K. Yoshida, Y. Yusa, H. Yuta, C.C. Zhang, J. Zhang, Y. Zheng, V. Zhilich, and D. Žontar

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, KEKB, Branching fraction, Detector, Radiative transfer, Resonance, B meson, Storage ring, High Energy Physics - Experiment
Abstract

We have measured the branching fraction of the inclusive radiative B meson decay B --> X(s) gamma to be Br(B->X(s)gamma)=(3.36 +/- 0.53(stat) +/- 0.42(sys) +0.50-0.54(th)) x 10^{-4}. The result is based on a sample of 6.07 x 10^6 BBbar events collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric e^+e^- storage ring., Comment: 14 pages, 6 Postsript figures, uses elsart.cls

Published
2001
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11. The instrumentation channel for the MUCOOL experiment

Author

Kirk T. McDonald, E.J. Prebys, H. Guler, S.A. Kahn, S.E. Vahsen, and C. Lu

Subjects
Physics, Muon, Solenoidal vector field, Physics::Instrumentation and Detectors, Solenoid, Particle accelerator, Accelerators and Storage Rings, law.invention, Nuclear physics, Muon collider, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Beam emittance, Beam (structure), Cherenkov radiation
Abstract

The MUCOOL facility is proposed to examine cooling techniques that could be used in a muon collider. The solenoidal beam channel before and after the cooling test section are instrumented to measure the beam emittance. This instrumentation channel includes a bent solenoid to provide dispersion and time projection chambers to measure the beam variables before and after the bend. The momentum of the muons is obtained from a measurement of the drift of the muon trajectory in the bent solenoid. The timing measurement is made by determining the phase from the momentum of the muon before and after it traverses RF cavities or by the use of a fast Cherenkov chamber. A computer simulation of the muon solenoidal channel is performed using GEANT. This study evaluates the resolution of the beam emittance measurement for MUCOOL.

Published
2003
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12. Measurements of Branching Fractions and Decay Amplitudes in B-> J/\psi K^* decays

Author

K. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A.M. Bakich, Y. Ban, E. Banas, A. Bay, P.K. Behera, A. Bondar, A. Bozek, T.E. Browder, B.C.K. Casey, Y. Chao, B.G. Cheon, R. Chistov, S.-K. Choi, Y. Choi, M. Danilov, L.Y. Dong, S. Eidelman, V. Eiges, Y. Enari, F. Fang, C. Fukunaga, T. Gershon, K. Gotow, R. Guo, J. Haba, K. Hanagaki, T. Hara, H. Hayashii, M. Hazumi, E.M. Heenan, I. Higuchi, T. Higuchi, T. Hokuue, Y. Hoshi, S.R. Hou, W.-S. Hou, H.-C. Huang, T. Igaki, T. Iijima, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwamoto, H. Iwasaki, Y. Iwasaki, P. Jalocha, J.H. Kang, J.S. Kang, P. Kapusta, S.U. Kataoka, N. Katayama, H. Kawai, Y. Kawakami, N. Kawamura, T. Kawasaki, H. Kichimi, D.W. Kim, Heejong Kim, H.J. Kim, H.O. Kim, Hyunwoo Kim, K. Kinoshita, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, Y.-J. Kwon, J.S. Lange, G. Leder, S.H. Lee, D. Liventsev, J. MacNaughton, G. Majumder, T. Matsuishi, S. Matsumoto, T. Matsumoto, W. Mitaroff, K. Miyabayashi, Y. Miyabayashi, H. Miyake, H. Miyata, G.R. Moloney, S. Mori, T. Mori, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, J.W. Nam, Z. Natkaniec, S. Nishida, O. Nitoh, T. Nozaki, S. Ogawa, F. Ohno, T. Ohshima, T. Okabe, S. Okuno, S.L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C.W. Park, H. Park, K.S. Park, L.E. Piilonen, M. Rozanska, K. Rybicki, H. Sagawa, S. Saitoh, Y. Sakai, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, S. Semenov, K. Senyo, R. Seuster, M.E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J.B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S.Y. Suzuki, T. Takahashi, F. Takasaki, N. Tamura, M. Tanaka, G.N. Taylor, Y. Teramoto, S. Tokuda, M. Tomoto, T. Tomura, S.N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, S. Uno, S.E. Vahsen, G. Varner, K.E. Varvell, C.H. Wang, J.G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B.D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, M. Yokoyama, K. Yoshida, Y. Yuan, Y. Yusa, J. Zhang, Z.P. Zhang, V. Zhilich, Z.M. Zhu, and D. Žontar

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Meson, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Cosmology and Extragalactic Astrophysics, Branching (polymer chemistry), Helicity, law.invention, High Energy Physics - Experiment, Transverse plane, Angular distribution, Amplitude, KEKB, law, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Collider, Astrophysics::Galaxy Astrophysics
Abstract

The branching fractions and the decay amplitudes of B -> J/psi K^* decays are measured in a 29.4/fb data sample collected with the Belle detector at the KEKB electron-positron collider. The decay amplitudes of helicity states of the J/psi K^* system are determined from the full angular distribution of the final state particles in the transversity basis. The branching fractions are measured to be (1.29\pm0.05\pm0.13) \times 10^{-3} for neutral mesons and (1.28\pm0.07\pm0.14) \times 10^{-3} for charged mesons. The measured longitudinal and transverse (perpendicular to the transversity plane) amplitudes are |A_0|^2 = 0.62\pm0.02\pm0.03 and |A_{\perp}|^2 = 0.19\pm0.02\pm0.03, respectively. The value of |A_{\perp}|^2 shows that the CP even component dominates in the B^0 \to J/\psi K^{*0}(K_S\pi^0) decay., Comment: 17 pages, 3 figures, 5 tables, to appear in Phys. Lett. B

Published
2002

13. Observation of Cabibbo-suppressed and W-exchange Lambda_c^+ baryon decays

Author

K. Abe, R. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A.M. Bakich, Y. Ban, E. Banas, S. Behari, P.K. Behera, A. Bondar, A. Bozek, T.E. Browder, B.C.K. Casey, P. Chang, Y. Chao, B.G. Cheon, R. Chistov, S.-K. Choi, Y. Choi, L.Y. Dong, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, N. Gabyshev, A. Garmash, T. Gershon, A. Gordon, R. Guo, J. Haba, H. Hamasaki, F. Handa, K. Hara, T. Hara, N.C. Hastings, H. Hayashii, M. Hazumi, E.M. Heenan, I. Higuchi, T. Higuchi, T. Hojo, T. Hokuue, Y. Hoshi, K. Hoshina, S.R. Hou, W.-S. Hou, S.-C. Hsu, H.-C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, H. Iwasaki, Y. Iwasaki, D.J. Jackson, P. Jalocha, H.K. Jang, R. Kagan, J.H. Kang, J.S. Kang, P. Kapusta, N. Katayama, H. Kawai, N. Kawamura, T. Kawasaki, H. Kichimi, D.W. Kim, Heejong Kim, H.J. Kim, H.O. Kim, Hyunwoo Kim, S.K. Kim, T.H. Kim, K. Kinoshita, H. Konishi, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y.-J. Kwon, J.S. Lange, G. Leder, S.H. Lee, D. Liventsev, R.-S. Lu, J. MacNaughton, T. Matsubara, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Miyabayashi, H. Miyake, H. Miyata, G.R. Moloney, S. Mori, T. Mori, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, E. Nakano, M. Nakao, J.W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S.L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C.S. Park, C.W. Park, H. Park, K.S. Park, L.S. Peak, J.-P. Perroud, M. Peters, L.E. Piilonen, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, O. Schneider, S. Schrenk, S. Semenov, K. Senyo, M.E. Sevior, H. Shibuya, B. Shwartz, J.B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S.Y. Suzuki, S.K. Swain, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, Y. Tanaka, G.N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S.N. Tovey, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, S.E. Vahsen, K.E. Varvell, C.C. Wang, C.H. Wang, J.G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B.D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, Y. Yamashita, M. Yamauchi, S. Yanaka, J. Yashima, M. Yokoyama, K. Yoshida, Y. Yuan, Y. Yusa, C.C. Zhang, J. Zhang, H.W. Zhao, Y. Zheng, V. Zhilich, and D. Žontar

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Sigma, FOS: Physical sciences, Lambda, High Energy Physics - Experiment, W-exchange, Baryon, Charmed baryon, High Energy Physics - Experiment (hep-ex), KEKB, Cabibbo-suppressed
Abstract

We present measurements of the Cabibbo-suppressed decays Lambda_c^+ --> Lambda0 K+ and Lambda_c^+ --> Sigma0 K+ (both first observations), Lambda_c^+ --> Sigma+ K+ pi- (seen with large statistics for the first time), Lambda_c^+ --> p K+ K- and Lambda_c^+ --> p phi (measured with improved accuracy). Improved branching ratio measurements for the decays Lambda_c^+ --> Sigma+ K+ K- and Lambda_c^+ --> Sigma+ phi, which are attributed to W-exchange diagrams, are shown. We also present the first evidence for Lambda_c^+ --> Xi(1690)^0 K+ and set an upper limit on the non-resonant decay Lambda_c^+ --> Sigma+ K+ K-. This analysis was performed using 32.6 fb^{-1} of data collected by the Belle detector at the asymmetric e+ e- collider KEKB., Submitted to Phys. Lett. B. v2: A small correction to the Authorlist was made. An earlier version of this analysis was released as BELLE-CONF-0130, hep-ex/0108003

Published
2001
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14. Application of Time Projection Chambers with GEMs and Pixels to WIMP Searches and Fast Neutron Detection

Author

J. A. Kadyk, Y. Nguyen, M. Rosen, T.N. Thorpe, S.E. Vahsen, S.J. Ross, J. Yamaoka, M. Garcia-Sciveres, I. Jaegle, and H. Feng

Subjects
Physics, Physics - Instrumentation and Detectors, Time projection chamber, Pixel, Physics::Instrumentation and Detectors, Detector, FOS: Physical sciences, Instrumentation and Detectors (physics.ins-det), Physics and Astronomy(all), Gas Electron Multipliers (GEM), High Energy Physics - Experiment, Nuclear physics, Time Projection Chambers (TPC), High Energy Physics - Experiment (hep-ex), WIMP, Gas electron multiplier, Neutron detection, Neutron, Pixel Electronics, Projection (set theory)
Abstract

We present work on the detection of neutral particles via nuclear recoils in gas-filled Time Projection Chambers (TPCs). We employ Gas Electron Multipliers (GEMs) to amplify the signal and silicon pixel electronics to detect the avalanche charge. These technologies allow ionization in the target gas to be detected with low noise, improved position and time resolution, and high efficiency. We review experimental results obtained in previous years, and report on ongoing simulation studies and construction of the first prototype at the University of Hawaii. We also present prospects of using such detectors to perform direction-sensitive searches for WIMP dark matter and fast neutron from fissionable material., Proceedings of 2nd International Conference on Technology and Instrumentation in Particle Physics (TIPP 2011), to be published in Physics Procedia, 8 pages, 9 figures

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