New graph-neural-network flavor tagger for Belle II and measurement of sin 2φ1 in B0 →J/ψ K S0 decays

I. Adachi, L. Aggarwal, H. Ahmed, H. Aihara, N. Akopov, A. Aloisio, N. Anh Ky, D. M. Asner, H. Atmacan, T. Aushev, V. Aushev, M. Aversano, R. Ayad, V. Babu, H. Bae, S. Bahinipati, P. Bambade, Sw Banerjee, S. Bansal, M. BarrettJ. Baudot, A. Baur, A. Beaubien, F. Becherer, J. Becker, J. V. Bennett, F. U. Bernlochner, V. Bertacchi, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, B. Bhuyan, F. Bianchi, L. Bierwirth, T. Bilka, S. Bilokin, D. Biswas, A. Bobrov, D. Bodrov, A. Bolz, A. Bondar, A. Bozek, M. Bračko, P. Branchini, R. A. Briere, T. E. Browder, A. Budano, S. Bussino, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, J. Cerasoli, M. C. Chang, P. Chang, P. Cheema, C. Chen, B. G. Cheon, K. Chilikin, K. Chirapatpimol, H. E. Cho, K. Cho, S. J. Cho, S. K. Choi, S. Choudhury, J. Cochran, L. Corona, S. Das, F. Dattola, E. De La Cruz-Burelo, S. A. De La Motte, G. De Nardo, M. De Nuccio, G. De Pietro, R. De Sangro, M. Destefanis, S. Dey, R. Dhamija, A. Di Canto, F. Di Capua, Z. DoleŽal, T. V. Dong, M. Dorigo, K. Dort, D. Dossett, S. Dreyer, S. Dubey, G. Dujany, P. Ecker, M. Eliachevitch, P. Feichtinger, T. Ferber, D. Ferlewicz, T. Fillinger, C. Finck, G. Finocchiaro, A. Fodor, F. Forti, A. Frey, B. G. Fulsom, A. Gabrielli, E. Ganiev, M. Garcia-Hernandez, R. Garg, G. Gaudino, V. Gaur, A. Gaz, A. Gellrich, G. Ghevondyan, D. Ghosh, H. Ghumaryan, G. Giakoustidis, R. Giordano, A. Giri, A. Glazov, B. Gobbo, R. Godang, O. Gogota, P. Goldenzweig, W. Gradl, T. Grammatico, E. Graziani, D. Greenwald, Z. Gruberová, T. Gu, Y. Guan, K. Gudkova, Y. Han, K. Hara, T. Hara, K. Hayasaka, H. Hayashii, S. Hazra, C. Hearty, M. T. Hedges, A. Heidelbach, I. Heredia De La Cruz, M. Hernández Villanueva, T. Higuchi, M. Hoek, M. Hohmann, P. Horak, C. L. Hsu, T. Humair, T. Iijima, K. Inami, N. Ipsita, A. Ishikawa, R. Itoh, M. Iwasaki, P. Jackson, W. W. Jacobs, D. E. Jaffe, E. J. Jang, Q. P. Ji, S. Jia, Y. Jin, K. K. Joo, H. Junkerkalefeld, H. Kakuno, D. Kalita, A. B. Kaliyar, J. Kandra, K. H. Kang, S. Kang, G. Karyan, T. Kawasaki, F. Keil, C. Kiesling, C. H. Kim, D. Y. Kim, K. H. Kim, Y. K. Kim, H. Kindo, K. Kinoshita, P. Kodyš, T. Koga, S. Kohani, K. Kojima, A. Korobov, S. Korpar, E. Kovalenko, R. Kowalewski, T. M.G. Kraetzschmar, P. KriŽan, P. Krokovny, T. Kuhr, Y. Kulii, J. Kumar, M. Kumar, R. Kumar, K. Kumara, T. Kunigo, A. Kuzmin, Y. J. Kwon, S. Lacaprara, Y. T. Lai, T. Lam, L. Lanceri, J. S. Lange, M. Laurenza, R. Leboucher, F. R. Le Diberder, M. J. Lee, D. Levit, C. Li, L. K. Li, Y. Li, Y. B. Li, J. Libby, Y. R. Lin, M. Liu, Q. Y. Liu, Z. Q. Liu, D. Liventsev, S. Longo, T. Lueck, C. Lyu, Y. Ma, M. Maggiora, S. P. Maharana, R. Maiti, S. Maity, G. Mancinelli, R. Manfredi, E. Manoni, M. Mantovano, D. Marcantonio, S. Marcello, C. Marinas, L. Martel, C. Martellini, A. Martini, T. Martinov, L. Massaccesi, M. Masuda, K. Matsuoka, D. Matvienko, S. K. Maurya, J. A. McKenna, R. Mehta, F. Meier, M. Merola, F. Metzner, C. Miller, M. Mirra, S. Mitra, K. Miyabayashi, H. Miyake, R. Mizuk, G. B. Mohanty, N. Molina-Gonzalez, S. Mondal, S. Moneta, H. G. Moser, M. Mrvar, R. Mussa, I. Nakamura, K. R. Nakamura, M. Nakao, Y. Nakazawa, A. Narimani Charan, M. Naruki, D. Narwal, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, G. Nazaryan, M. Neu, C. Niebuhr, S. Nishida, S. Ogawa, Y. Onishchuk, H. Ono, Y. Onuki, P. Oskin, F. Otani, P. Pakhlov, G. Pakhlova, A. Panta, S. Pardi, K. Parham, H. Park, S. H. Park, B. Paschen, A. Passeri, S. Patra, S. Paul, T. K. Pedlar, R. Peschke, R. Pestotnik, M. Piccolo, L. E. Piilonen, G. Pinna Angioni, P. L.M. Podesta-Lerma, T. Podobnik, S. Pokharel, C. Praz, S. Prell, E. Prencipe, M. T. Prim, I. Prudiiev, H. Purwar, P. Rados, G. Raeuber, S. Raiz, N. Rauls, M. Reif, S. Reiter, M. Remnev, I. Ripp-Baudot, G. Rizzo, M. Roehrken, J. M. Roney, A. Rostomyan, N. Rout, G. Russo, D. A. Sanders, S. Sandilya, A. Sangal, L. Santelj, Y. Sato, V. Savinov, B. Scavino, C. Schmitt, C. Schwanda, M. Schwickardi, Y. Seino, A. Selce, K. Senyo, J. Serrano, M. E. Sevior, C. Sfienti, W. Shan, X. D. Shi, T. Shillington, T. Shimasaki, J. G. Shiu, D. Shtol, A. Sibidanov, F. Simon, J. B. Singh, J. Skorupa, R. J. Sobie, M. Sobotzik, A. Soffer, A. Sokolov, E. Solovieva, S. Spataro, B. Spruck, M. Starič, P. Stavroulakis, S. Stefkova, R. Stroili, M. Sumihama, K. Sumisawa, W. Sutcliffe, H. Svidras, M. Takizawa, U. Tamponi, S. Tanaka, K. Tanida, F. Tenchini, O. Tittel, R. Tiwary, D. Tonelli, E. Torassa, K. Trabelsi, I. Tsaklidis, M. Uchida, I. Ueda, Y. Uematsu, K. Unger, Y. Unno, K. Uno, S. Uno, P. Urquijo, Y. Ushiroda, S. E. Vahsen, R. Van Tonder, K. E. Varvell, M. Veronesi, A. Vinokurova, V. S. Vismaya, L. Vitale, V. Vobbilisetti, R. Volpe, B. Wach, M. Wakai, S. Wallner, E. Wang, M. Z. Wang, X. L. Wang, Z. Wang, A. Warburton, S. Watanuki, C. Wessel, E. Won, X. P. Xu, B. D. Yabsley, S. Yamada, W. Yan, S. B. Yang, J. Yelton, J. H. Yin, K. Yoshihara, C. Z. Yuan, Y. Yusa, B. Zhang, V. Zhilich, Q. D. Zhou, X. Y. Zhou, V. I. Zhukova, R. Žlebčík

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Abstract

We present GFlaT, a new algorithm that uses a graph-neural-network to determine the flavor of neutral B mesons produced in ϒ(4S) decays. It improves previous algorithms by using the information from all charged final-state particles and the relations between them. We evaluate its performance using B decays to flavor-specific hadronic final states reconstructed in a 362 fb-1 sample of electron-positron collisions collected at the ϒ(4S) resonance with the Belle II detector at the SuperKEKB collider. We achieve an effective tagging efficiency of (37.40±0.43±0.36%), where the first uncertainty is statistical and the second systematic, which is 18% better than the previous Belle II algorithm. Demonstrating the algorithm, we use B0→J/ψKS0 decays to measure the mixing-induced and direct CP violation parameters, S=(0.724±0.035±0.009) and C=(-0.035±0.026±0.029).

Original languageEnglish
Article number012001
JournalPhysical Review D
Volume110
Issue number1
DOIs
StatePublished - 1 Jul 2024

Funding

FundersFunder number
University of Victoria
CNRS
IN2P3
Narodowe Centrum Nauki
Institut National de Physique Nucléaire et de Physique des Particules
Akademi Sains Malaysia
Universiti Malaya
National Institute of Informatics
Korea Institute of Science and Technology Information
Instituto Nazionale di Fisica Nucleare
Thailand Center of Excellence in Physics
Department of Science and Technology, Ministry of Science and Technology, India
Ministry of Education and Science of Ukraine
Canarie
GridKA
Ministry of Education and Science of the Russian Federation
Austrian Federal Ministry of Education, Science and Research
MPG
MEXT
HGF
Natural Sciences and Engineering Research Council of Canada
National Science and Technology Council
BMBF
TUBITAK ULAKBIM
KREONET
Ministry of Education
Compute Canada
European Research Council
Ministerstwo Edukacji i Nauki
GLORIAD
DFG
AvH Foundation
INFN
Ministry of Education, Culture, Sports, Science and Technology
NII
Ministry of Higher Education, MalaysiaFOINS-296, CB-180023, CB-254409, CB-236394, CB-221329
Ministry of Higher Education, Malaysia
National Science FoundationPHY-2111604, PHY-1913789
National Science Foundation
Natural Science Foundation of Shandong ProvinceZR2022JQ02
Natural Science Foundation of Shandong Province
Agence Nationale de la RechercheANR-21-CE31-0009
Agence Nationale de la Recherche
Australian Research CouncilDP210101900, DP210102831, DE220100462, DP200101792, LE210100098, LE230100085
Australian Research Council
National Key Research and Development Program of China2022YFA1601903
National Key Research and Development Program of China
Horizon 2020 ERC-Advanced267104, 884719
Horizon 2020 ERC947006
Japan Society for the Promotion of Science26400255, 18H05226, 16H06492, 18K03621, 22H00144, 19H00682, 20H05850, 26220706, 17H01133, 22K21347, 16K05323, 20H05858, 16H03993, 16H03968, 17H05405, 23H05433, 22K14056, 18H03710
Japan Society for the Promotion of Science
Israel Science Foundation2476/17
Israel Science Foundation
Seventh FrameworkPIEF-GA-2013-622527
Department of Atomic Energy, Government of IndiaRTI 4002
Department of Atomic Energy, Government of India
Generalitat Valenciana, SpainCIDEGENT/2018/020
National Research Foundation of Korea2022R1-A2C-1003993, 2018R1-A2B-3003643, 2018R1-A6A1A-06024970, 2016R1-D1A1B-02012900, 2021R1-A6A1A-03043957, 2021R1-F1A-1064008, 2021R1-F1A-1060423, RS-2022-00197659, 2019R1-I1A3A-01058933
National Research Foundation of Korea
SEP-CINVESTAV237
Horizon 2020 Marie Sklodowska-Curie700525, 822070, 101026516
Slovenian Research Agency and ResearchJ1-9124, P1-0135
UPES SEEDD-SOE/20062022/06, D-SEED-INFRA/17052023/01
University of Tabuk ResearchS-0280-1439, S-0256-1438
Israel Ministry of Science3-16543
Czech Science Foundation22-18469S
U.S. Department of Energy and ResearchDE-SC0010007, DE-AC06-76RLO1830, DE-SC0010118, DE-SC0010504, DE-SC0012704, DE-SC0021616, DE-SC0010073, DE-SC0011784, DE-SC0021274, DE-SC0022350, DE-SC0019230, DE-SC0023470, DE-SC0009824, DE-SC0007983, DE-SC0009973
Austrian Science FundP 31361-N36
Austrian Science Fund
Higher Education and Science Committee of the Republic of Armenia23LCG-1C011
Agencia Estatal de InvestigaciónRYC2020-029875-I
Agencia Estatal de Investigación
Vietnam Academy of Science and TechnologyDL0000.02/24-25, NVCC.05.12/22-23
Vietnam Academy of Science and Technology
U.S.-Israel Binational Science Foundation2016113
National Natural Science Foundation of China and Research12175041, 12135005, 11975076, 11761141009, 11575017, 12150004, 12161141008, 11705209
National Research Foundation of Ukraine2020.02/0257
National Research Foundation of Ukraine
Horizon 2020 ERC-Consolidator819127

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