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New graph-neural-network flavor tagger for Belle II and measurement of sin 2ϕ1 in B0→J/ψKS0 decays

Published:2024-07-03 Issue:1 Volume:110 Page:
ISSN:2470-0010
Container-title:Physical Review D
language:en
Short-container-title:Phys. Rev. D

Author:

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

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).

Published by the American Physical Society

2024

Funder

Ministry of Education and Science

Australian Research Council

Bundesministerium für Bildung und Forschung

Austrian Science Fund

Horizon 2020 Framework Programme

European Research Council

Natural Sciences and Engineering Research Council of Canada

National Key Research and Development Program of China

National Natural Science Foundation of China

Natural Science Foundation of Shandong Province

Grantová Agentura ?eské Republiky

HORIZON EUROPE Marie Sklodowska-Curie Actions

Institut National de Physique Nucléaire et de Physique des Particules

Centre National de la Recherche Scientifique

Agence Nationale de la Recherche

Deutsche Forschungsgemeinschaft

Helmholtz-Gemeinschaft

Max-Planck-Gesellschaft

Alexander von Humboldt-Stiftung

Department of Atomic Energy, Government of India

Department of Science and Technology, Ministry of Science and Technology, India

Israel Science Foundation

United States - Israel Binational Agricultural Research and Development Fund

Istituto Nazionale di Fisica Nucleare Sezione di Padova

Japan Society for the Promotion of Science

Ministry of Education, Culture, Sports, Science and Technology

National Research Foundation of Korea

Korea Institute of Science and Technology Information

Universiti Malaya

Akademi Sains Malaysia

Kementerian Pendidikan Malaysia

Ministerstwo Edukacji i Nauki

Institute of Energy, Hefei Comprehensive National Science Center

Ministry of Science and Higher Education of the Russian Federation

Central University Basic Research Fund of China

University of Tabuk

Agencia Estatal de Investigación

Generalitat Valenciana

National Science and Technology Council

Ministry of Education

National Research Foundation of Ukraine

Ministry of Education and Science of Ukraine

National Science Foundation

U.S. Department of Energy

Vietnam Academy of Science and Technology

Brookhaven National Laboratory

Deutsches Elektronen-Synchrotron

Instituto Nazionale di Fisica Nucleare

Radiation Science Research Institute

Publisher

American Physical Society (APS)

Link

http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.110.012001/fulltext

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4. Measurement of CP Violation in B0→ψ(→ℓ+ℓ−)KS0(→π+π−) Decays

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