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1. Dielectric Assist Accelerating Structures for Compact Linear Accelerators of Low Energy Particles in Hadrontherapy Treatments

Author

Martinez-Reviriego, Pablo, Esperante, Daniel, Grudiev, Alexej, Gimeno, Benito, Blanch, César, González-Iglesias, Daniel, Fuster-Martínez, Nuria, Martín-Luna, Pablo, Martínez, Eduardo, Menendez, Abraham, and Fuster, Juan

Subjects
Physics - Accelerator Physics, Physics - Applied Physics, Physics - Medical Physics
Abstract

Dielectric Assist Accelerating (DAA) structures based on ultralow-loss ceramic are being studied as an alternative to conventional disk-loaded copper cavities. This accelerating structure consists of dielectric disks with irises arranged periodically in metallic structures working under the TM$_{02}$-$\pi$ mode. In this paper, the numerical design of an S-band DAA structure for low beta particles, such as protons or carbon ions used for Hadrontherapy treatments, is shown. Four dielectric materials with different permittivity and loss tangent are studied as well as different particle velocities. Through optimization, a design that concentrates most of the RF power in the vacuum space near the beam axis is obtained, leading to a significant reduction of power loss on the metallic walls. This allows to fabricate cavities with an extremely high quality factor, over 100 000, and shunt impedance over 300 M$\Omega$/m at room temperature. During the numerical study, the design optimization has been improved by adjusting some of the cell parameters in order to both increase the shunt impedance and reduce the peak electric field in certain locations of the cavity, which can lead to instabilities in its normal functioning.

Published
2023

2. Non-resonant ultra-fast multipactor regime in dielectric-assist accelerating structures

Author

González-Iglesias, Daniel, Gimeno, Benito, Esperante, Daniel, Martinez-Reviriego, Pablo, Martín-Luna, Pablo, Fuster-Martínez, Nuria, Blanch, César, Martínez, Eduardo, Menendez, Abraham, Fuster, Juan, and Grudiev, Alexej

Subjects
Physics - Accelerator Physics, Physics - Plasma Physics
Abstract

The objective of this work is the evaluation of the risk of suffering a multipactor discharge in an S-band dielectric-assist accelerating (DAA) structure for a compact low-energy linear particle accelerator dedicated to hadrontherapy treatments. A DAA structure consists of ultra-low loss dielectric ciylinders and disks with irises which are periodically arranged in a metallic enclosure, with the advantage of having an extremely high quality factor and very high shunt impedance at room temperature, and it is therefore proposed as a potential alternative to conventional disk-loaded copper structures. However, it has been observed that these structures suffer from multipactor discharges. In fact, multipactor is one of the main problems of these devices, as it limits the maximum accelerating gradient. Because of this, the analysis of multipactor risk in the early design steps of DAA cavities is crucial to ensure the correct performance of the device after fabrication. In this paper, we present a comprehensive and detailed study of multipactor in our DAA design through numerical simulations performed with an in-house developed code based on the Monte-Carlo method. The phenomenology of the multipactor (resonant electron trajectories, electron flight time between impacts, etc.) is described in detail for different values of the accelerating gradient. It has been found that in these structures an ultra-fast non-resonant multipactor appears, which is different from the types of multipactor theoretically studied in the scientific literature. In addition, the effect of several low electron emission coatings on the multipactor threshold is investigated. Furthermore, a novel design based on the modification of the DAA cell geometry for multipactor mitigation is introduced, which shows a significant increase in the accelerating gradient handling capabilities of our prototype.

Published
2023

3. Report of the Topical Group on Top quark physics and heavy flavor production for Snowmass 2021

Author

Schwienhorst, Reinhard, Wackeroth, Doreen, Agashe, Kaustubh, Alioli, Simone, Aparisi, Javier, Bevilacqua, Giuseppe, Bi, Huan-Yu, Brock, Raymond, Camacho, Abel Gutierrez, Cordero, Fernando Febres, de Blas, Jorge, Demina, Regina, Du, Yong, Durieux, Gauthier, Fein, Jarrett, Franceschini, Roberto, Fuster, Juan, Garzelli, Maria Vittoria, Gavardi, Alessandro, Gombas, Jason, Grojean, Christoph, Gu, Jiale, Guzzi, Marco, Hartanto, Heribertus Bayu, Hoang, Andre, Holguin, Jack, Irles, Adrian, Kidonakis, Nikolaos, Kim, Dojin, Kraus, Manfred, Lepenik, Christopher, Liss, Tony M., Mantani, Luca, Mantry, Sonny, Mateu, Vicent, Melini, Davide, Michel, J., Miralles, Victor, Lopez, Marcos Miralles, Llacer, Maria Moreno, Moch, Sven-Olaf, Nadolsky, Pavel, Neumann, Tobias, Narain, Meenakshi, Nasufi, Jasmina, Nowak, Kacper, Pathak, Aditya, Peskin, Michael, Poncelet, Rene, Procura, Massimiliano, Reina, Laura, Rodrigo, G., Sathyan, Deepak, Sawford, Sara, Simon, Frank, Spira, Michael, Stewart, Ian, Tairafune, Seidai, Tian, Junping, Tricoli, Alessandro, Uwer, Peter, Vryonidou, Eleni, Voss, Katharina, Vos, Marcel, Worek, Malgorzata, Xie, Keping, Yamamoto, Hitoshi, Yunamine, Ryo, Yu, Zhite, Yuan, C. -P., and Zarnecki, Aleksander Filip

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

This report summarizes the work of the Energy Frontier Topical Group on EW Physics: Heavy flavor and top quark physics (EF03) of the 2021 Community Summer Study (Snowmass). It aims to highlight the physics potential of top-quark studies and heavy-flavor production processes (bottom and charm) at the HL-LHC and possible future hadron and lepton colliders and running scenarios.

Published
2022

4. Snowmass White Paper: prospects for measurements of the bottom quark mass

Author

Aparisi, Javier, Fuster, Juan, Hoang, Andre, Irles, Adrian, Lepenik, Christopher, Mateu, Vicent, Rodrigo, German, Spira, Michael, Tairafune, Seidai, Tian, Junping, Vos, Marcel, Yamamoto, Hitoshi, and Yonamine, Ryo

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

In this white paper for the Snowmass '21 community planning exercise we provide quantitative prospects for bottom quark mass measurements in high-energy collisions at future colliders that can provide a precise test of the scale evolution, or "running" of quark masses predicted by QCD.

Published
2022

5. The International Linear Collider: Report to Snowmass 2021

Author

Aryshev, Alexander, Behnke, Ties, Berggren, Mikael, Brau, James, Craig, Nathaniel, Freitas, Ayres, Gaede, Frank, Gessner, Spencer, Gori, Stefania, Grojean, Christophe, Heinemeyer, Sven, Jeans, Daniel, Kruger, Katja, List, Benno, List, Jenny, Liu, Zhen, Michizono, Shinichiro, Miller, David W., Moult, Ian, Murayama, Hitoshi, Nakada, Tatsuya, Nanni, Emilio, Nojiri, Mihoko, Padamsee, Hasan, Perelstein, Maxim, Peskin, Michael E., Poeschl, Roman, Posen, Sam, Robson, Aidan, Strube, Jan, Suehara, Taikan, Tian, Junping, Titov, Maxim, Vos, Marcel, White, Andrew, Wilson, Graham, Yokoya, Kaoru, Zarnecki, Aleksander Filip, Adachi, Ichiro, Agashe, Kaustubh, Jovin, Tatjana Agatonovic, Aihara, Hiroaki, Altmannshofer, Wolfgang, Alves, Daniele, Anguiano, Justin, Aoki, Ken-Ichi, Aoki, Masato, Aoki, Toshihiro, Aoki, Yumi, Arai, Yasuo, Araki, Hayato, Asada, Haruka, Asai, Kento, Asai, Shoji, Attie, David, Baer, Howard, Bagger, Jonathan, Bai, Yang, Bailey, Ian, Barrue, Ricardo, Bartoldus, Rainer, Barzi, Emanuela, Basso, Matthew, Bauerdick, Lothar, Baum, Sebastian, Bellerive, Alain, Belomestnykh, Sergey, Antequera, Jorge Berenguer, Beyer, Jakob, Bhat, Pushpalatha, Bilki, Burak, Black, Kevin, Bloom, Kenneth, Bodwin, Geoffrey, Boisvert, Veronique, Boran, Fatma, Boudry, Vincent, Boughezal, Radja, Boveia, Antonio, Bozovic-Jelisavcic, Ivanka, Brient, Jean-Claude, Brodsky, Stanley, Brunetti, Laurent, Buesser, Karsten, Bulyak, Eugene, Burrows, Philip N., Burt, Graeme C., Cai, Yunhai, Cairo, Valentina, Canepa, Anadi, Celiberto, Francesco Giovanni, Cenni, Enrico, Chacko, Zackaria, Chaikovska, Iryna, Checchin, Mattia, Chen, Lisong, Chen, Thomas Y., Cheng, Hsin Chia, Cho, Gi-Chol, Choudhary, Brajesh, Clarke, Jim, Cline, James, Co, Raymond, Cohen, Timothy, Colas, Paul, Damerell, Chris, Das, Arindam, Dasu, Sridhara, Dawson, Sally, de Blas, Jorge, de Lima, Carlos Henrique, Deandrea, Aldo, Dehmelt, Klaus, Delayen, Jean, Demarteau, Marcel, Denisov, Dmitri, Dermisek, Radovan, Dieguez, Angel, Dohmae, Takeshi, Dopke, Jens, Dort, Katharina, Du, Yong, Dudar, Bohdan, Dutta, Bhaskar, Dutta, Juhi, Einhaus, Ulrich, Elsen, Eckhard, Endo, Motoi, Eremeev, Grigory, Eren, Engin, Erler, Jens, Esarey, Eric, Everett, Lisa, Golfe, Angeles Faus, Garcia, Marcos Fernandez, Foster, Brian, Fourches, Nicolas, Fouz, Mary-Cruz, Fujii, Keisuke, Fujimoto, Junpei, Torregrosa, Esteban Fullan, Furukawa, Kazuro, Fusayasu, Takahiro, Fuster, Juan, Ganjour, Serguei, Gao, Yuanning, Gaur, Naveen, Geng, Rongli, Georgi, Howard, Gherghetta, Tony, Goldstein, Joel, Goncalves, Dorival, Gonski, Julia, Gonzalo, Tomas, Goto, Takeyoshi, Goto, Toru, Graf, Norman, Grames, Joseph, Grannis, Paul, Gray, Lindsey, Grohsjean, Alexander, Gu, Jiayin, Guler, Yalcin, Gutierrez, Phillip, Haba, Junji, Haber, Howard, Hallford, John, Hamaguchi, Koichi, Han, Tao, Hara, Kazuhiko, Harada, Daisuke, Hashimoto, Koji, Hashino, Katsuya, Hayashi, Masahito, Heinrich, Gudrun, Hidaka, Keisho, Higuchi, Takeo, Hinode, Fujio, Hioki, Zenro, Hirose, Minoru, Hiroshima, Nagisa, Hisano, Junji, Hollik, Wolfgang, Homiller, Samuel, Hong, Sungwoo, Hook, Anson, Horii, Yasuyuki, Hoshina, Hiroki, Hristova, Ivana, Huitu, Katri, Hyakutake, Yoshifumi, Iijima, Toru, Ikematsu, Katsumasa, Ilderton, Anton, Inami, Kenji, Irles, Adrian, Ishikawa, Akimasa, Ishiwata, Koji, Ito, Hayato, Ivanov, Igor, Iwamoto, Sho, Iwamoto, Toshiyuki, Iwasaki, Masako, Iwashita, Yoshihisa, Jia, Haoyi, Morales, Fabricio Jimenez, Joshi, Prakash, Jung, Sunghoon, Kacarevic, Goran, Kagan, Michael, Kakizaki, Mitsuru, Kalinowski, Jan, Kaminski, Jochen, Kanaya, Kazuyuki, Kanemura, Shinya, Kanno, Hayato, Kano, Yuya, Kashiwagi, Shigeru, Kato, Yukihiro, Kawada, Nanami, Kawada, Shin-ichi, Kawagoe, Kiyotomo, Khoze, Valery, Kichimi, Hiromichi, Kim, Doojin, Kitahara, Teppei, Kitano, Ryuichiro, Klamka, Jan, Komamiya, Sachio, Kong, K. C., Konomi, Taro, Kotera, Katsushige, Kou, Emi, Kravchenko, Ilya, Kubo, Kiyoshi, Kubo, Takayuki, Kumaoka, Takuya, Kumar, Ashish, Kumar, Nilanjana, Kunath, Jonas, Kundu, Saumyen, Kunitomo, Hiroshi, Kurata, Masakazu, Kuriki, Masao, Kusenko, Alexander, Lagouri, Theodota, Lankford, Andrew J., Lastovicka-Medin, Gordana, Diberder, Francois Le, Lee, Claire, Liepe, Matthias, Linacre, Jacob, Liptak, Zachary, Lomte, Shivani, Low, Ian, Ma, Yang, Maalouf, Hani, MacFarlane, David, Madison, Brendon, Madlener, Thomas, Maeda, Tomohito, Malek, Paul, Mandal, Sanjoy, Markiewicz, Thomas, Marshall, John, Martens, Aurelien, Martin, Victoria, Martinello, Martina, Rivero, Celso Martinez, Maru, Nobuhito, Matheson, John, Matsumoto, Shigeki, Matsunaga, Hiroyuki, Matsuo, Yutaka, Mawatari, Kentarou, Mbagwu, Johnpaul, McIntosh, Peter, McKeown, Peter, Meade, Patrick, Mekala, Krzysztof, Merkel, Petra, Mihara, Satoshi, Miralles, Víctor, Lopez, Marcos Miralles, Mishima, Go, Mishima, Satoshi, Mistlberger, Bernhard, Mitov, Alexander, Miyabayashi, Kenkichi, Miyamoto, Akiya, Mohanty, Gagan, Monaco, Laura, Mondragon, Myriam, Montgomery, Hugh E., Moortgat-Pick, Gudrid, Morange, Nicolas, Llacer, María Moreno, Moretti, Stefano, Mori, Toshinori, Morii, Toshiyuki, Moroi, Takeo, Morrissey, David, Nachman, Benjamin, Nagano, Kunihiro, Nakajima, Jurina, Nakamura, Eiji, Narita, Shinya, Nath, Pran, Nelson, Timothy, Newbold, David, Niki, Atsuya, Nishimura, Yasuhiro, Nishiyama, Eisaku, Nomura, Yasunori, Nowak, Kacper, Nozaki, Mitsuaki, de Vera, María Teresa Nunez Pardo, Ochoa, Ines, Ogata, Masahito, Ohashi, Satoru, Ohta, Hikaru, Ohta, Shigemi, Ohuchi, Norihito, Oide, Hideyuki, Okada, Nobuchika, Okada, Yasuhiro, Okawa, Shohei, Okayasu, Yuichi, Okugawa, Yuichi, Okugi, Toshiyuki, Okui, Takemichi, Okuyama, Yoshitaka, Omet, Mathieu, Omori, Tsunehiko, Ono, Hiroaki, Onoe, Tomoki, Ootani, Wataru, Otono, Hidetoshi, Ozawa, Shuhei, Griso, Simone Pagan, Papa, Alessandro, Paparella, Rocco, Park, Eun-Kyung, Perez, Gilad, Perez-Lorenzana, Abdel, Peters, Yvonne, Petriello, Frank, Piedra, Jonatan, Porod, Werner, Potter, Christopher, Price, Alan, Radkhorrami, Yasser, Reina, Laura, Reuter, Juergen, Richard, Francois, Riemann, Sabine, Rimmer, Robert, Rizzo, Thomas, Robens, Tania, Ruber, Roger, Jimeno, Alberto Ruiz, Saeki, Takayuki, Saha, Ipsita, Saito, Tomoyuki, Sakaguchi, Makoto, Sakai, Tadakatsu, Sakaki, Yasuhito, Sakurai, Kodai, Salvatico, Riccardo, Salvatore, Fabrizio, San, Yik Chuen, Sandick, Pearl, Sanuki, Tomoyuki, Sasikumar, Kollassery Swathi, Schaefer, Oliver, Schaefer, Ruth, Schneekloth, Uwe, Schoerner-Sadenius, Thomas, Schroeder, Carl, Schuster, Philip, Schwartzman, Ariel, Schwienhorst, Reinhard, Sefkow, Felix, Seiya, Yoshihiro, Sekiguchi, Motoo, Sekizawa, Kazuyuki, Senyo, Katsumi, Sert, Hale, Sertore, Danielev, Settles, Ronald, Shafi, Qaisar, Shahdara, Tetsuo, Haghi, Barmak Shams Es, Sharma, Ashish, Shelton, Jessie, Shepherd-Themistocleous, Claire, Shibuya, Hiroto, Shidara, Tetsuo, Shimomura, Takashi, Shindou, Tetsuo, Shoji, Yutaro, Shu, Jing, Sievers, Ian, Simon, Frank, Singh, Rajeev, Soreq, Yotam, Stanitzki, Marcel, Stapnes, Steinar, Steinhebel, Amanda, Stupak, John, Su, Shufang, Suekane, Fumihiko, Sugamoto, Akio, Sugawara, Yuji, Sugimoto, Satoru, Sugimoto, Yasuhiro, Sugiyama, Hiroaki, Sumino, Yukinari, Sundrum, Raman, Suzuki, Atsuto, Suzuki, Shin, Swiatlowski, Maximilian, Tait, Tim M. P., Takahashi, Shota, Takahashi, Tohru, Takeshita, Tohru, Takeuchi, Michihisa, Takubo, Yosuke, Tanabe, Tomohiko, Tanedo, Philip, Tanimoto, Morimitsu, Tao, Shuichiro, Tata, Xerxes, Tauchi, Toshiaki, Taylor, Geoffrey, Terada, Takahiro, Terunuma, Nobuhiro, Thaler, Jesse, Thea, Alessandro, Tillinger, Finn, Timmermans, Jan, Tobioka, Kohsaku, Toda, Kouichi, Tokiyasu, Atsushi, Toma, Takashi, Torndal, Julie, Tosun, Mehmet, Tsai, Yu-Dai, Tseng, Shih-Yen, Tsumura, Koji, Tuckler, Douglas, Uchida, Yoshiki, Uchiyama, Yusuke, Ueda, Daiki, Ukegawa, Fumihiko, Umemori, Kensei, Urakawa, Junji, Vallee, Claude, Vega, Roberto, Velasco, Liliana, Verdu-Andres, Silvia, Vernieri, Caterina, Vila, Anna, Alvarez, Ivan Vila, Vossebeld, Joost, Vsrms, Raghava, Vukasinovic, Natasa, Wackeroth, Doreen, Wakida, Moe, Wang, Liantao, Washio, Masakazu, Watanabe, Takashi, Watson, Nigel, Watts, Gordon, Weiglein, Georg, Wells, James D., Wenskat, Marc, Westhoff, Susanne, White, Glen, Williams, Ciaran, Willocq, Stephane, Wing, Matthew, Winter, Alasdair, Winter, Marc, Wu, Yongcheng, Xie, Keping, Xu, Tao, Yakovlev, Vyacheslav, Yamada, Shuei, Yamamoto, Akira, Yamamoto, Hitoshi, Yamamoto, Kei, Yamamoto, Yasuchika, Yamanaka, Masato, Yamashita, Satoru, Yamatani, Masahiro, Yamatsu, Naoki, Yasui, Shigehiro, Yoda, Takuya, Yonamine, Ryo, Yoshihara, Keisuke, Yoshioka, Masakazu, Yoshioka, Tamaki, Yuasa, Fukuko, Yumino, Keita, Zerwas, Dirk, Zheng, Ya-Juan, Zhou, Jia, Zhu, Hua Xing, Zobov, Mikhail, and Zomer, Fabian

Subjects
Physics - Accelerator Physics, High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

The International Linear Collider (ILC) is on the table now as a new global energy-frontier accelerator laboratory taking data in the 2030s. The ILC addresses key questions for our current understanding of particle physics. It is based on a proven accelerator technology. Its experiments will challenge the Standard Model of particle physics and will provide a new window to look beyond it. This document brings the story of the ILC up to date, emphasizing its strong physics motivation, its readiness for construction, and the opportunity it presents to the US and the global particle physics community., Comment: 356 pages, Large pdf file (40 MB) submitted to Snowmass 2021; v2 references to Snowmass contributions added, additional authors; v3 references added, some updates, additional authors

Published
2022

6. Top-quark mass extraction from $t\bar{t}j +X$ events at the LHC: theory predictions

Author

Alioli, Simone, Fuster, Juan, Garzelli, Maria Vittoria, Gavardi, Alessandro, Irles, Adrian, Melini, Davide, Moch, Sven-Olaf, Uwer, Peter, and Voß, Katharina

Subjects
High Energy Physics - Phenomenology
Abstract

Past work has proven the possibility of extracting the top-quark mass, one of the fundamental parameters of the Standard Model, from the comparison of theory predictions and experimental measurements of differential cross-sections for $t\bar{t} j~+~X$ hadroproduction. Various experimental analyses in this respect have already been performed, and new ones are in preparation on the basis of the latest data from $pp$ collisions collected at the Large Hadron Collider. We have produced and made public a comprehensive set of theoretical predictions for the relevant differential distributions, ready to be used for presently ongoing and forthcoming experimental analyses. We investigate the role of different theoretical inputs, in particular the factorization and renormalization scales, PDFs and top-quark mass renormalization schemes, and we quantify the uncertainties related to different choices for these inputs, providing recommendations., Comment: 15 pages, 6 Figures, contribution to Snowmass 2021

Published
2022

7. Phenomenology of $t\bar{t}j + X$ production at the LHC

Author

Alioli, Simone, Fuster, Juan, Garzelli, Maria Vittoria, Gavardi, Alessandro, Irles, Adrian, Melini, Davide, Moch, Sven-Olaf, Uwer, Peter, and Voß, Katharina

Subjects
High Energy Physics - Phenomenology
Abstract

We present phenomenological results for $t\bar{t}j + X$ production at the Large Hadron Collider, of interest for designing forthcoming experimental analyses of this process. We focus on those cases where the $t\bar{t}j + X$ process is considered as a signal. We discuss present theoretical uncertainties and the dependence on relevant input parameters entering the computation. For the ${\cal R}$ distribution, which depends on the invariant mass of the $t\bar{t}j$-system, we present reference predictions in the on-shell, $\overline{\mbox{MS}}$ and MSR top-quark mass renormalization schemes, applying the latter scheme to this process for the first time. Our conclusions are particularly interesting for those analyses aiming at extracting the top-quark mass from cross-section measurements., Comment: 64 pages, LaTeX, 38 figures, 14 tables, slightly modified version, as in JHEP

Published
2022
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8. $m_b$ at $m_H$: the running bottom quark mass and the Higgs boson

Author

Aparisi, Javier, Fuster, Juan, Hoang, André, Irles, Adrián, Lepenik, Christopher, Rodrigo, Germán, Spira, Michael, Tairafune, Seidai, Vos, Marcel, Yamamoto, Hitoshi, and Yonamine, Ryo

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

We present a new measurement of the bottom quark mass in the $\bar{MS}$ scheme at the renormalization scale of the Higgs boson mass from measurements of Higgs boson decay rates at the LHC: $m_b(m_H)= 2.60^{+0.36}_{-0.31}$ GeV. The measurement has a negligible theory uncertainty and excellent prospects to improve at the HL-LHC and a future Higgs factory. Confronting this result, and $m_b(m_b)$ from low-energy measurements and $m_b(m_Z)$ from $Z-$pole data, with the prediction of the scale evolution of the renormalization group equations, we find strong evidence for the "running" of the bottom quark mass., Comment: 4 pages + 2 figures + 2 pages of supplementary material

Published
2021
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9. Prospects for the measurement of the $b$-quark mass at the ILC

Author

Fuster, Juan, Irles, Adrian, Rodrigo, German, Tairafune, Seidai, Vos, Marcel, Yamamoto, Hitoshi, and Yonamine, Ryo

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology
Abstract

This note presents an analysis of the potential of future high-energy electron-positron colliders to measure the $b$-quark mass. We perform a full-simulation study of the measurement of the ratio of the three-jet rates in events with $b\bar{b}(g)$ and $q\bar{q}(g)$ production, $R_{3}^{bl}$, and assess the dominant uncertainties, including theory and experimental systematic uncertainties. We find that the ILC "Higgs factory" stage, with an integrated luminosity of 2 ab$^{-1}$ at $\sqrt{s}=$ 250 GeV can measure the $b-$quark $bar{MS}$ mass at a scale of 250 GeV ($m_b(250~$GeV$)$) with a precision of 1 GeV. From this result we extrapolate the potential of the GigaZ run running at $\sqrt{s}= m_Z$. We expect $m_b(m_Z)$ can be determined with an 0.12 GeV uncertainty, exceeding the precision of the LEP and SLD measurements by a factor $\sim$3., Comment: Talk presented at the International Workshop on Future Linear Colliders (LCWS2021), 15-18 March 2021. C21-03-15.1

Published
2021

11. ILC Study Questions for Snowmass 2021

Author

Fujii, Keisuke, Grojean, Christophe, Peskin, Michael E., Barklow, Tim, Gao, Yuanning, Kanemura, Shinya, List, Jenny, Nojiri, Mihoko, Perelstein, Maxim, Poeschl, Roman, Reuter, Juergen, Simon, Frank, Tanabe, Tomohiko, Wells, James D., Berggren, Mikael, Fullana, Esteban, Fuster, Juan, Gaede, Frank, Gori, Stefania, Jeans, Daniel, Irles, Adrian, Jung, Sunghoon, Kawada, Shin-Ichi, Matsumoto, Shigeki, Potter, Chris, Strube, Jan, Suehara, Taikan, Tian, Junping, Vos, Marcel, Wilson, Graham, Yamamoto, Hitoshi, Yonamine, Ryo, Zarnecki, Aleksander Filip, Brau, James, and Murayama, Hitoshi

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

To aid contributions to the Snowmass 2021 US Community Study on physics at the International Linear Collider and other proposed $e^+e^-$ colliders, we present a list of study questions that could be the basis of useful Snowmass projects. We accompany this with links to references and resources on $e^+e^-$ physics, and a description of a new software framework that we are preparing for $e^+e^-$ studies at Snowmass., Comment: 49 pages, 1 figure, 1 table; v2: correction of some web links; v3: new Section 3 with a description of the ILC simulation framework put in place for Snowmass

Published
2020

12. Top quark mass measurement in radiative events at electron-positron colliders

Author

Boronat, Marça, Fullana, Esteban, Fuster, Juan, Gomis, Pablo, Hoang, André, Mateu, Vicent, Vos, Marcel, and Widl, Angelika

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

In this letter, we evaluate potential of linear $e^+e^-$ colliders to measure the top quark mass in radiative events and in a suitable short-distance scheme. We present a calculation of the differential cross section for production of a top quark pair in association with an energetic photon from initial state radiation, as a function of the invariant mass of the $t\bar{t}$ system. This {\it matched} calculation includes the QCD enhancement of the cross section around the $t\bar{t}$ production threshold and remains valid in the continuum well above the threshold. The uncertainty in the top mass determination is evaluated in realistic operating scenarios for the Compact Linear Collider (CLIC) and the International Linear Collider (ILC), including the statistical uncertainty and the theoretical and experimental systematic uncertainties. With this method, the top quark mass can be determined with a precision of $110$ MeV in the initial stage of CLIC, with $1$ ab$^{-1}$ at $\sqrt{s} =$ 380 GeV, and with a precision of approximately $150$ MeV at the ILC, with $L = 4$ ab$^{-1}$ at $\sqrt{s}= 500$ GeV. Radiative events allow measurements of the top quark mass at different renormalization scales, and we demonstrate that such a measurement can yield a statistically significant test of the evolution of the MSR mass $m_t^{\rm MSR}(R)$ for scales $R< m_t$., Comment: 10 pages + bibliography

Published
2019
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13. The International Linear Collider: A Global Project

Author

Bambade, Philip, Barklow, Tim, Behnke, Ties, Berggren, Mikael, Brau, James, Burrows, Philip, Denisov, Dmitri, Faus-Golfe, Angeles, Foster, Brian, Fujii, Keisuke, Fuster, Juan, Gaede, Frank, Grannis, Paul, Grojean, Christophe, Hutton, Andrew, List, Benno, List, Jenny, Michizono, Shinichiro, Miyamoto, Akiya, Napoly, Olivier, Peskin, Michael, Poeschl, Roman, Simon, Frank, Strube, Jan, Tian, Junping, Titov, Maksym, Vos, Marcel, White, Andrew, Wilson, Graham, Yamamoto, Akira, Yamamoto, Hitoshi, and Yokoya, Kaoru

Subjects
High Energy Physics - Experiment, High Energy Physics - Phenomenology, Physics - Accelerator Physics
Abstract

The International Linear Collider (ILC) is now under consideration as the next global project in particle physics. In this report, we review of all aspects of the ILC program: the physics motivation, the accelerator design, the run plan, the proposed detectors, the experimental measurements on the Higgs boson, the top quark, the couplings of the W and Z bosons, and searches for new particles. We review the important role that polarized beams play in the ILC program. The first stage of the ILC is planned to be a Higgs factory at 250 GeV in the centre of mass. Energy upgrades can naturally be implemented based on the concept of a linear collider. We discuss in detail the ILC program of Higgs boson measurements and the expected precision in the determination of Higgs couplings. We compare the ILC capabilities to those of the HL-LHC and to those of other proposed e+e- Higgs factories. We emphasize throughout that the readiness of the accelerator and the estimates of ILC performance are based on detailed simulations backed by extensive RandD and, for the accelerator technology, operational experience., Comment: 104 pages, 88 figures; v2: minor typo corrections; v3: many minor changes, including small corrections to the Tables and Figures in Section 11

Published
2019

14. The International Linear Collider. A Global Project

Author

Aihara, Hiroaki, Bagger, Jonathan, Bambade, Philip, Barish, Barry, Behnke, Ties, Bellerive, Alain, Berggren, Mikael, Brau, James, Breidenbach, Martin, Bozovic-Jelisavcic, Ivanka, Burrows, Philip, Caccia, Massimo, Colas, Paul, Denisov, Dmitri, Eigen, Gerald, Evans, Lyn, Faus-Golfe, Angeles, Foster, Brian, Fujii, Keisuke, Fuster, Juan, Gaede, Frank, Gao, Jie, Grannis, Paul, Grojean, Christophe, Hutton, Andrew, Idzik, Marek, Jeremie, Andrea, Kawagoe, Kiyotomo, Komamiya, Sachio, Lesiak, Tadeusz, Levy, Aharon, List, Benno, List, Jenny, Michizono, Shinichiro, Miyamoto, Akiya, Mnich, Joachim, Montgomery, Hugh, Murayama, Hitoshi, Napoly, Olivier, Okada, Yasuhiro, Pagani, Carlo, Peskin, Michael, Poeschl, Roman, Richard, Francois, Robson, Aidan, Schoerner-Sadenius, Thomas, Stanitzki, Marcel, Stapnes, Steinar, Strube, Jan, Suzuki, Atsuto, Tian, Junping, Titovx, Maksym, Vos, Marcel, Walkerx, Nicholas, Weise, Hans, White, Andrew, Wilson, Graham, Winter, Marc, Yamada, Sakue, Yamamoto, Akira, Yamamoto, Hitoshi, and Yamashita, Satoru

Subjects
High Energy Physics - Experiment, Physics - Accelerator Physics, Physics - Instrumentation and Detectors
Abstract

A large, world-wide community of physicists is working to realise an exceptional physics program of energy-frontier, electron-positron collisions with the International Linear Collider (ILC). This program will begin with a central focus on high-precision and model-independent measurements of the Higgs boson couplings. This method of searching for new physics beyond the Standard Model is orthogonal to and complements the LHC physics program. The ILC at 250 GeV will also search for direct new physics in exotic Higgs decays and in pair-production of weakly interacting particles. Polarised electron and positron beams add unique opportunities to the physics reach. The ILC can be upgraded to higher energy, enabling precision studies of the top quark and measurement of the top Yukawa coupling and the Higgs self-coupling. The key accelerator technology, superconducting radio-frequency cavities, has matured. Optimised collider and detector designs, and associated physics analyses, were presented in the ILC Technical Design Report, signed by 2400 scientists. There is a strong interest in Japan to host this international effort. A detailed review of the many aspects of the project is nearing a conclusion in Japan. Now the Japanese government is preparing for a decision on the next phase of international negotiations, that could lead to a project start within a few years. The potential timeline of the ILC project includes an initial phase of about 4 years to obtain international agreements, complete engineering design and prepare construction, and form the requisite international collaboration, followed by a construction phase of 9 years.

Published
2019

15. The International Linear Collider. A European Perspective

Author

Bambade, Philip, Behnke, Ties, Berggren, Mikael, Bozovic-Jelisavcic, Ivanka, Burrows, Philip, Caccia, Massimo, Colas, Paul, Eigen, Gerald, Evans, Lyn, Faus-Golfe, Angeles, Foster, Brian, Fuster, Juan, Gaede, Frank, Grojean, Christophe, Idzik, Marek, Jeremie, Andrea, Lesiak, Tadeusz, Levy, Aharon, List, Benno, List, Jenny, Mnich, Joachim, Napoly, Olivier, Pagani, Carlo, Poeschl, Roman, Richard, Francois, Robson, Aidan, Schoerner-Sadenius, Thomas, Stanitzki, Marcel, Stapnes, Steinar, Titov, Maksym, Vos, Marcel, Walker, Nicholas, Weise, Hans, and Winter, Marc

Subjects
High Energy Physics - Experiment, Physics - Accelerator Physics, Physics - Instrumentation and Detectors
Abstract

The International Linear Collider (ILC) being proposed in Japan is an electron-positron linear collider with an initial energy of 250 GeV. The ILC accelerator is based on the technology of superconducting radio-frequency cavities. This technology has reached a mature stage in the European XFEL project and is now widely used. The ILC will start by measuring the Higgs properties, providing high-precision and model-independent determinations of its parameters. The ILC at 250 GeV will also search for direct new physics in exotic Higgs decays and in pair-production of weakly interacting particles. The use of polarised electron and positron beams opens new capabilities and scenarios that add to the physics reach. The ILC can be upgraded to higher energy, enabling precision studies of the top quark and measurement of the top Yukawa coupling and the Higgs self-coupling. The international -- including European -- interest for the project is very strong. Europe has participated in the ILC project since its early conception and plays a major role in its present development covering most of its scientific and technological aspects: physics studies, accelerator and detectors. The potential for a wide participation of European groups and laboratories is thus high, including important opportunities for European industry. Following decades of technical development, R&D, and design optimisation, the project is ready for construction and the European particle physics community, technological centers and industry are prepared to participate in this challenging endeavour.

Published
2019

21. Dielectric assist accelerating structures for compact linear accelerators of low energy particles in hadrontherapy treatments

Author

Martinez-Reviriego, Pablo, primary, Esperante, Daniel, additional, Grudiev, Alexej, additional, Gimeno, Benito, additional, Blanch, César, additional, González-Iglesias, Daniel, additional, Fuster-Martínez, Nuria, additional, Martín-Luna, Pablo, additional, Martínez, Eduardo, additional, Menendez, Abraham, additional, and Fuster, Juan, additional

Published
2024
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22. The International Linear Collider Technical Design Report - Volume 4: Detectors

Author

Behnke, Ties, Brau, James E., Burrows, Philip N., Fuster, Juan, Peskin, Michael, Stanitzki, Marcel, Sugimoto, Yasuhiro, Yamada, Sakue, and Yamamoto, Hitoshi

Subjects
Physics - Instrumentation and Detectors
Abstract

The International Linear Collider Technical Design Report (TDR) describes in four volumes the physics case and the design of a 500 GeV centre-of-mass energy linear electron-positron collider based on superconducting radio-frequency technology using Niobium cavities as the accelerating structures. The accelerator can be extended to 1 TeV and also run as a Higgs factory at around 250 GeV and on the Z0 pole. A comprehensive value estimate of the accelerator is give, together with associated uncertainties. It is shown that no significant technical issues remain to be solved. Once a site is selected and the necessary site-dependent engineering is carried out, construction can begin immediately. The TDR also gives baseline documentation for two high-performance detectors that can share the ILC luminosity by being moved into and out of the beam line in a "push-pull" configuration. These detectors, ILD and SiD, are described in detail. They form the basis for a world-class experimental programme that promises to increase significantly our understanding of the fundamental processes that govern the evolution of the Universe., Comment: See also http://www.linearcollider.org/ILC/TDR . The full list of signatories is inside the Report

Published
2013

23. The International Linear Collider Technical Design Report - Volume 1: Executive Summary

Author

Behnke, Ties, Brau, James E., Foster, Brian, Fuster, Juan, Harrison, Mike, Paterson, James McEwan, Peskin, Michael, Stanitzki, Marcel, Walker, Nicholas, and Yamamoto, Hitoshi

Subjects
Physics - Accelerator Physics, High Energy Physics - Phenomenology, Physics - Instrumentation and Detectors
Abstract

The International Linear Collider Technical Design Report (TDR) describes in four volumes the physics case and the design of a 500 GeV centre-of-mass energy linear electron-positron collider based on superconducting radio-frequency technology using Niobium cavities as the accelerating structures. The accelerator can be extended to 1 TeV and also run as a Higgs factory at around 250 GeV and on the Z0 pole. A comprehensive value estimate of the accelerator is give, together with associated uncertainties. It is shown that no significant technical issues remain to be solved. Once a site is selected and the necessary site-dependent engineering is carried out, construction can begin immediately. The TDR also gives baseline documentation for two high-performance detectors that can share the ILC luminosity by being moved into and out of the beam line in a "push-pull" configuration. These detectors, ILD and SiD, are described in detail. They form the basis for a world-class experimental programme that promises to increase significantly our understanding of the fundamental processes that govern the evolution of the Universe., Comment: See also http://www.linearcollider.org/ILC/TDR . The full list of contributing institutes is inside the Report

Published
2013

24. A new observable to measure the top-quark mass at hadron colliders

Author

Alioli, Simone, Fernandez, Patricia, Fuster, Juan, Irles, Adrian, Moch, Sven-Olaf, Uwer, Peter, and Vos, Marcel

Subjects
High Energy Physics - Phenomenology, High Energy Physics - Experiment
Abstract

A new method to measure the top-quark mass in high energetic hadron collisions is presented. We use theoretical predictions calculated at next-to-leading order accuracy in quantum chromodynamics to study the (normalized) differential distribution of the \ttbaronejet cross section with respect to its invariant mass $\sqrt{\sttj}$. The sensitivity of the method to the top-quark mass together with the impact of various theoretical and experimental uncertainties has been investigated and quantified. The new method allows for a complementary measurement of the top-quark mass parameter and has a high potential to become competitive in precision with respect to established approaches. Furthermore we emphasize that in the proposed method the mass parameter is uniquely defined through one-loop renormalization.

Published
2013
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25. Top-quark pair-production with one jet and parton showering at hadron colliders

Author

Alioli, Simone, Fuster, Juan, Irles, Adrian, Moch, Sven-Olaf, Uwer, Peter, and Vos, Marcel

Subjects
High Energy Physics - Phenomenology
Abstract

We present heavy-flavor production in association with one jet in hadronic collisions matched to parton shower Monte Carlo predictions at next-to-leading order QCD with account of top-quark decays and spin correlations. We use the POWHEGBOX for the interface to the parton shower programs PYTHIA or HERWIG. Phenomenological studies for the LHC and the Tevatron are presented with particular emphasis on the inclusion of spin-correlation effects in top decay and the impact of the parton shower on the top-quark charge asymmetries. As a novel application of the present calculation the measurement of the top-quark mass is discussed., Comment: 4 pages latex, 6 figures, Procs. of XX International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS 2012)

Published
2012

32. Chronic Kidney Disease–Associated Pruritus and Quality of Life: Learning from Our Patients

Author

Esteve-Simó, Vicent, primary, Perez-Morales, Rosa, additional, Buades-Fuster, Juan Manuel, additional, Arenas Jimenez, Maria Dolores, additional, Areste-Fosalba, Nuria, additional, Alcalde Bezhold, Guillermo, additional, Blanco Santos, Ana, additional, Sanchez Álvarez, Emilio, additional, Sanchez Villanueva, Rafael, additional, Molina, Pablo, additional, Ojeda, Raquel, additional, Prieto-Velasco, Mario, additional, and Goicoechea, Marian, additional

Published
2023
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35. Measurement of substructure-dependent jet suppression in Pb+Pb collisions at 5.02 TeV with the ATLAS detector

Author

Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

The ATLAS detector at the Large Hadron Collider has been used to measure jet substructure modification and suppression in Pb+Pb collisions at a nucleon–nucleon center-of-mass energy s = 5.02 TeV in comparison with proton–proton (pp) collisions at √s = 5.02 TeV. The Pb+Pb data, collected in 2018, have an integrated luminosity of 1.72 nb, while the ppdata, collected in 2017, have an integrated luminosity of 260 pb. Jets used in this analysis are clustered using the anti-k algorithm with a radius parameter R = 0.4. The jet constituents, defined by both tracking and calorimeter information, are used to determine the angular scale r of the first hard splitting inside the jet by reclustering them using the Cambridge–Aachen algorithm and employing the soft-drop grooming technique. The nuclear modification factor, R, used to characterize jet suppression in Pb+Pb collisions, is presented differentially in r, jet transverse momentum, and in intervals of collision centrality. The R value is observed to depend significantly on jet r. Jets produced with the largest measured r are found to be twice as suppressed as those with the smallest r in central Pb+Pb collisions. The R values do not exhibit a strong variation with jet p in any of the r intervals. The r and p dependence of jet R is qualitatively consistent with a picture of jet quenching arising from coherence and provides the most direct evidence in support of this approach.

Published
2023

36. Search for a light charged Higgs boson in t -> H±b decays, with H± -> cb, in the lepton plus jets final state in proton-proton collisions at root s=13 TeV with the ATLAS detector

Author

Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Estrada, Oscar, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Mamuzic, Judita, Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, L, Moreno Llácer, María, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Estrada, Oscar, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Mamuzic, Judita, Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, L, Moreno Llácer, María, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

A search for a charged Higgs boson, H-+/-, produced in top-quark decays, t -> H(+/-)b, is presented. The search targets H-+/- decays into a bottom and a charm quark, H-+/- -> cb. The analysis focuses on a selection enriched in top-quark pair production, where one top quark decays into a leptonically decaying W boson and a bottom quark, and the other top quark decays into a charged Higgs boson and a bottom quark. This topology leads to a lepton-plus-jets final state, characterised by an isolated electron or muon and at least four jets. The search exploits the high multiplicity of jets containing b-hadrons, and deploys a neural network classifier that uses the kinematic differences between the signal and the background. The search uses a dataset of proton-proton collisions collected at a centre-of-mass energy root s = 13TeV between 2015 and 2018 with the ATLAS detector at CERN's Large Hadron Collider, amounting to an integrated luminosity of 139 fb(-1). Observed (expected) 95% confidence-level upper limits between 0.15% (0.09%) and 0.42% (0.25%) are derived for the product of branching fractions B( t -> H-+/- b) x B( H +/- -> cb) for charged Higgs boson masses between 60 and 160 GeV, assuming the SM production of the top-quark pairs.

Published
2023

37. Search for resonant WZ production in the fully leptonic final state in proton–proton collisions at √s=13 TeV with the ATLAS detector

Author

Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

A search for a WZ resonance, in the fully leptonic final state (electrons or muons), is performed using 139 fb of data collected at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. The results are interpreted in terms of a singly charged Higgs boson of the Georgi–Machacek model, produced by WZ fusion, and of a Heavy Vector Triplet, with the resonance produced by WZ fusion or the Drell–Yan process. No significant excess over the Standard Model prediction is observed and limits are set on the production cross-section times branching ratio as a function of the resonance mass for these processes.

Published
2023

38. Search for heavy Majorana or Dirac neutrinos and right-handed W gauge bosons in final states with charged leptons and jets in pp collisions at root s=13 TeV with the ATLAS detector

Author

Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72], Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Bouchhar, Naseem, Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Chitishvili, Mariam, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Lacasta Llácer, Carlos, Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valiente Moreno, Enrique, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72], Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Bouchhar, Naseem, Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Chitishvili, Mariam, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Lacasta Llácer, Carlos, Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valiente Moreno, Enrique, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

A search for heavy right-handed Majorana or Dirac neutrinos N-R and heavy right-handed gauge bosons W-R is performed in events with energetic electrons or muons, with the same or opposite electric charge, and energetic jets. The search is carried out separately for topologies of clearly separated final-state products (resolved channel) and topologies with boosted final states with hadronic and/or leptonic products partially overlapping and reconstructed as a large-radius jet (boosted channel). The events are selected from pp collision data at the LHC with an integrated luminosity of 139 fb(-1) collected by the ATLAS detector at root s = 13 TeV. No significant deviations from the Standard Model predictions are observed. The results are interpreted within the theoretical framework of a left-right symmetric model, and lower limits are set on masses in the heavy right-handed W-R boson and N-R plane. The excluded region extends to about m(W-R) = 6.4 TeV for both Majorana and Dirac N-R neutrinos at m(N-R) < 1 TeV. N-R with masses of less than 3.5 (3.6) TeV are excluded in the electron (muon) channel at m(W-R) = 4.8 TeV for the Majorana neutrinos, and limits of m(N-R) up to 3.6 TeV for m(W-R) = 5.2 (5.0) TeV in the electron (muon) channel are set for the Dirac neutrinos. These constitute the most stringent exclusion limits to date for the model considered.

Published
2023

39. Performance of the reconstruction of large impact parameter tracks in the inner detector of ATLAS

Author

Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72], Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Bouchhar, Naseem, Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Lacasta Llácer, Carlos, Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valiente Moreno, Enrique, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72], Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Bouchhar, Naseem, Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Lacasta Llácer, Carlos, Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valiente Moreno, Enrique, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

Searches for long-lived particles (LLPs) are among the most promising avenues for discovering physics beyond the Standard Model at the Large Hadron Collider (LHC). However, displaced signatures are notoriously difficult to identify due to their ability to evade standard object reconstruction strategies. In particular, the ATLAS track reconstruction applies strict pointing requirements which limit sensitivity to charged particles originating far from the primary interaction point. To recover efficiency for LLPs decaying within the tracking detector volume, the ATLAS Collaboration employs a dedicated large-radius tracking (LRT) passwith loosened pointing requirements. During Run 2 of the LHC, the LRT implementation produced many incorrectly reconstructed tracks and was therefore only deployed in small subsets of events. In preparation for LHC Run 3, ATLAS has significantly improved both standard and large-radius track reconstruction performance, allowing for LRT to run in all events. This development greatly expands the potential phase-space of LLP searches and streamlines LLP analysis workflows. This paper will highlight the above achievement and report on the readiness of the ATLAS detector for track-based LLP searches in Run 3.

Published
2023

40. Correlations between flow and transverse momentum in Xe + Xe and Pb + Pb collisions at the LHC with the ATLAS detector: A probe of the heavy-ion initial state and nuclear deformation

Author

European Commission, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, European Commission, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

The correlations between flow harmonics v for n = 2, 3, and 4 and mean transverse momentum [p] in Xe + Xe and Pb + Pb collisions at s = 5.44 and 5.02 TeV, respectively, are measured using charged particles with the ATLAS detector. The correlations are potentially sensitive to the shape and size of the initial geometry, nuclear deformation, and initial momentum anisotropy. The effects from nonflow and centrality fluctuations are minimized, respectively, via a subevent cumulant method and an event-activity selection based on particle production at very forward rapidity. The v-[p] correlations show strong dependencies on centrality, harmonic number n, p, and pseudorapidity range. Current models qualitatively describe the overall centrality- and system-dependent trends but fail to quantitatively reproduce all features of the data. In central collisions, where models generally show good agreement, the v-[p] correlations are sensitive to the triaxiality of the quadruple deformation. Comparison of the model with the Pb + Pb and Xe + Xe data confirms that the Xe nucleus is a highly deformed triaxial ellipsoid that has neither a prolate nor oblate shape. This provides strong evidence for a triaxial deformation of the Xe nucleus from high-energy heavy-ion collisions.

Published
2023

41. Measurements of W+W- production in decay topologies inspired by searches for electroweak supersymmetry

Author

Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72], Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72], Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

This paper presents a measurement of fiducial and differential cross-sections for WW production in proton–proton collisions at s=13 TeV with the ATLAS experiment at the Large Hadron Collider using a dataset corresponding to an integrated luminosity of 139 fb . Events with exactly one electron, one muon and no hadronic jets are studied. The fiducial region in which the measurements are performed is inspired by searches for the electroweak production of supersymmetric charginos decaying to two-lepton final states. The selected events have moderate values of missing transverse momentum and the ‘stransverse mass’ variable m , which is widely used in searches for supersymmetry at the LHC. The ranges of these variables are chosen so that the acceptance is enhanced for direct WW production and suppressed for production via top quarks, which is treated as a background. The fiducial cross-section and particle-level differential cross-sections for six variables are measured and compared with two theoretical SM predictions from perturbative QCD calculations.

Published
2023

42. Constraints on spin-0 dark matter mediators and invisible Higgs decays using ATLAS 13 TeV pp collision data with two top quarks and missing transverse momentum in the final state

Author

Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), https://ror.org/02gfc7t72, Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), https://ror.org/02gfc7t72, Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

This paper presents a statistical combination of searches targeting final states with two top quarks and invisible particles, characterised by the presence of zero, one or two leptons, at least one jet originating from a b-quark and missing transverse momentum. The analyses are searches for phenomena beyond the Standard Model consistent with the direct production of dark matter in pp collisions at the LHC, using 139 fb of data collected with the ATLAS detector at a centre-of-mass energy of 13 TeV. The results are interpreted in terms of simplified dark matter models with a spin-0 scalar or pseudoscalar mediator particle. In addition, the results are interpreted in terms of upper limits on the Higgs boson invisible branching ratio, where the Higgs boson is produced according to the Standard Model in association with a pair of top quarks. For scalar (pseudoscalar) dark matter models, with all couplings set to unity, the statistical combination extends the mass range excluded by the best of the individual channels by 50 (25) GeV, excluding mediator masses up to 370 GeV. In addition, the statistical combination improves the expected coupling exclusion reach by 14% (

Published
2023

43. Measurements of differential cross sections of Higgs boson production through gluon fusion in the H? WW*? e?µ? final state at √s=13 TeV with the ATLAS detector

Author

Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72], Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Bouchhar, Naseem, Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Chitishvili, Mariam, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Lacasta Llácer, Carlos, Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, M., Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72], Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Bouchhar, Naseem, Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Chitishvili, Mariam, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Lacasta Llácer, Carlos, Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, M., Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

Higgs boson production via gluon–gluon fusion is measured in the WW? e?µ? decay channel. The dataset utilized corresponds to an integrated luminosity of 139 fb collected by the ATLAS detector from s=13 TeV proton–proton collisions delivered by the Large Hadron Collider between 2015 and 2018. Differential cross sections are measured in a fiducial phase space restricted to the production of at most one additional jet. The results are consistent with Standard Model expectations, derived using different Monte Carlo generators.

Published
2023

44. Measurement of the Higgs boson mass in the H → ZZ⁎ → 4ℓ decay channel using 139 fb−1 of s=13 TeV pp collisions recorded by the ATLAS detector at the LHC

Author

Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), https://ror.org/02gfc7t72, Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Bouchhar, Naseem, Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Chitishvili, Mariam, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), https://ror.org/02gfc7t72, Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Bouchhar, Naseem, Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Chitishvili, Mariam, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

The mass of the Higgs boson is measured in the H→ZZ→4ℓ decay channel. The analysis uses proton–proton collision data from the Large Hadron Collider at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector between 2015 and 2018, corresponding to an integrated luminosity of 139 fb. The measured value of the Higgs boson mass is 124.99±0.18(stat.)±0.04(syst.) GeV. In final states with muons, this measurement benefits from an improved momentum-scale calibration relative to that adopted in previous publications. The measurement also employs an analytic model that takes into account the invariant-mass resolution of the four-lepton system on a per-event basis and the output of a deep neural network discriminating signal from background events. This measurement is combined with the corresponding measurement using 7 and 8 TeV pp collision data, resulting in a Higgs boson mass of 124.94±0.17(stat.)±0.03(syst.) GeV.

Published
2023

45. Measurement of the nuclear modification factor of b-jets in 5.02 TeV Pb+Pb collisions with the ATLAS detector

Author

Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

This paper presents a measurement of b-jet production in Pb+Pb and pp collisions at sNN=5.02 TeV with the ATLAS detector at the LHC. The measurement uses 260 pb of pp collisions collected in 2017 and 1.4 nb of Pb+Pb collisions collected in 2018. In both collision systems, jets are reconstructed via the anti- k algorithm. The b-jets are identified from a sample of jets containing muons from the semileptonic decay of b-quarks using template fits of the muon momentum relative to the jet axis. In pp collisions, b-jets are reconstructed for radius parameters R= 0.2 and R= 0.4 , and only R= 0.2 jets are used in Pb+Pb collisions. For comparison, inclusive R= 0.2 jets are also measured using 1.7 nb of Pb+Pb collisions collected in 2018 and the same pp collision data as the b-jet measurement. The nuclear modification factor, R , is calculated for both b-jets and inclusive jets with R= 0.2 over the transverse momentum range of 80–290 GeV. The nuclear modification factor for b-jets decreases from peripheral to central collisions. The ratio of the b-jet R to inclusive jet R is also presented and suggests that the R for b-jets is larger than that for inclusive jets in central Pb+Pb collisions. The measurements are compared with theoretical calculations and suggest a role for mass and colour-charge effects in partonic energy loss in heavy-ion collisions.

Published
2023

46. Luminosity determination in pp collisions at √s=13 TeV using the ATLAS detector at the LHC

Author

Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), https://ror.org/02gfc7t72, Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Bouchhar, Naseem, Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Chitishvili, Mariam, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Lacasta Llácer, Carlos, Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valiente Moreno, Enrique, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), https://ror.org/02gfc7t72, Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Bouchhar, Naseem, Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Chitishvili, Mariam, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Lacasta Llácer, Carlos, Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valiente Moreno, Enrique, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

The luminosity determination for the ATLAS detector at the LHC during Run 2 is presented, with pp collisions at a centre-of-mass energy s=13 TeV. The absolute luminosity scale is determined using van der Meer beam separation scans during dedicated running periods in each year, and extrapolated to the physics data-taking regime using complementary measurements from several luminosity-sensitive detectors. The total uncertainties in the integrated luminosity for each individual year of data-taking range from 0.9% to 1.1%, and are partially correlated between years. After standard data-quality selections, the full Run 2 pp data sample corresponds to an integrated luminosity of 140.1 ± 1.2 fb , i.e. an uncertainty of 0.83%. A dedicated sample of low-pileup data recorded in 2017–2018 for precision Standard Model physics measurements is analysed separately, and has an integrated luminosity of 338.1 ± 3.1 pb .

Published
2023

47. Observation of gauge boson joint-polarisation states in W±Z production from pp collisions at s=13 TeV with the ATLAS detector

Author

Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), https://ror.org/02gfc7t72, Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Bouchhar, Naseem, Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Chitishvili, Mariam, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), https://ror.org/02gfc7t72, Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Bouchhar, Naseem, Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Chitishvili, Mariam, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

Measurements of joint-polarisation states of W and Z gauge bosons in WZ production are presented. The data set used corresponds to an integrated luminosity of 139 fb of proton–proton collisions at a centre-of-mass energy of 13 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. The WZ candidate events are reconstructed using leptonic decay modes of the gauge bosons into electrons and muons. The simultaneous pair-production of longitudinally polarised vector bosons is measured for the first time with a significance of 7.1 standard deviations. The measured joint helicity fractions integrated over the fiducial region are f=0.067±0.010, f=0.110±0.029, f=0.179±0.023 and f=0.644±0.032, in agreement with the next-to-leading-order Standard Model predictions. Individual helicity fractions of the W and Z bosons are also measured and found to be consistent with joint helicity fractions within the expected amounts of correlation. Both the joint and individual helicity fractions are also measured separately in WZ and WZ events. Inclusive and differential cross sections for several kinematic observables sensitive to polarisation are presented.

Published
2023

48. Strong Constraints on Jet Quenching in Centrality-Dependent p+Pb Collisions at 5.02 TeV from ATLAS

Author

European Commission, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, European Commission, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

Jet quenching is the process of color-charged partons losing energy via interactions with quark-gluon plasma droplets created in heavy-ion collisions. The collective expansion of such droplets is well described by viscous hydrodynamics. Similar evidence of collectivity is consistently observed in smaller collision systems, including p p and p + Pb collisions. In contrast, while jet quenching is observed in Pb + Pb collisions, no evidence has been found in these small systems to date, raising fundamental questions about the nature of the system created in these collisions. The ATLAS experiment at the Large Hadron Collider has measured the yield of charged hadrons correlated with reconstructed jets in 0.36 nb - 1 of p + Pb and 3.6 pb - 1 of p p collisions at 5.02 TeV. The yields of charged hadrons with p T ch > 0.5 GeV near and opposite in azimuth to jets with p T jet > 30 or 60 GeV, and the ratios of these yields between p + Pb and p p collisions, I p Pb , are reported. The collision centrality of p + Pb events is categorized by the energy deposited by forward neutrons from the struck nucleus. The I p Pb values are consistent with unity within a few percent for hadrons with p T ch > 4 GeV at all centralities. These data provide new, strong constraints that preclude almost any parton energy loss in central p + Pb collisions.

Published
2023

49. Measurement of the charge asymmetry in top-quark pair production in association with a photon with the ATLAS experiment

Author

European Commission, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Bouchhar, Naseem, Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Chitishvili, Mariam, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, European Commission, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Bouchhar, Naseem, Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Chitishvili, Mariam, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

A measurement of the charge asymmetry in top-quark pair (tt¯) production in association with a photon is presented. The measurement is performed in the single-lepton tt¯ decay channel using proton–proton collision data collected with the ATLAS detector at the Large Hadron Collider at CERN at a centre-of-mass-energy of 13 TeV during the years 2015–2018, corresponding to an integrated luminosity of 139 fb. The charge asymmetry is obtained from the distribution of the difference of the absolute rapidities of the top quark and antiquark using a profile likelihood unfolding approach. It is measured to be A=−0.003±0.029 in agreement with the Standard Model expectation.

Published
2023

50. Observation of Single-Top-Quark Production in Association with a Photon Using the ATLAS Detector

Author

European Commission, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, ATLAS Collaboration, European Commission, Ministerio de Ciencia e Innovación (España), Generalitat Valenciana, Agencia Estatal de Investigación (España), Amos, K.R., Aparisi, Pozo, J.A., Bailey, A.J., Cabrera, Susana, Cantero, Josu, Cardillo, Fabio, Castillo Mª Victoria, Costa, María José, Didenko, Mariia, Escobar, Carlos, Fiorini, L., Fullana, Esteban, Fuster, Juan, García García, Carmen, García Navarro, José Enrique, Gomez Delegido, A.J., González de la Hoz, Santiago, Gonzalvo Rodríguez, Galo Rafael, Guerrero Rojas, J.G.R., Higón, Emilio, Lacasta Llácer, Carlos, Lozano Bahilo, José J., Martí García, Salvador, Martinez Agullo, Pablo, Miralles López, Marcos, Mitsou, Vasiliki A., Monsonis Romero, Luis, Moreno Llácer, María, Muñoz Perez, David, Navarro Gonzalez, Josep, Poveda, Joaquín, Prades Ibañez, Alberto, Rubio Jiménez, Adrián, Ruiz Martínez, Arantxa, Sabatini, Paolo, Salt, José, Sanchez Sebastian, Victoria, Sayago Galvan, Ivan, Senthilkumar, Varsha, Soldevila, Urmila, Sánchez Martínez, Javier, Torró Pastor, Emma, Valero, Alberto, Valls Ferrer, Juan Antonio, Varriale, Lorenzo, Villaplana Pérez, Miguel, Vos, Marcel, and ATLAS Collaboration

Abstract

This Letter reports the observation of single top quarks produced together with a photon, which directly probes the electroweak coupling of the top quark. The analysis uses 139 fb^{-1} of 13 TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. Requiring a photon with transverse momentum larger than 20 GeV and within the detector acceptance, the fiducial cross section is measured to be 688±23(stat) _{-71}^{+75}(syst) fb, to be compared with the standard model prediction of 515_{-42}^{+36} fb at next-to-leading order in QCD.

Published
2023

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