B-flavor tagging at Belle II

F. Abudinén*, N. Akopov, A. Aloisio, V. Babu, Sw Banerjee, M. Bauer, J. V. Bennett, F. U. Bernlochner, M. Bessner, S. Bettarini, T. Bilka, S. Bilokin, D. Biswas, D. Bodrov, J. Borah, M. Bračko, P. Branchini, A. Budano, M. Campajola, G. CasarosaC. Cecchi, R. Cheaib, V. Chekelian, C. Chen, Y. Q. Chen, H. E. Cho, S. Cunliffe, G. De Nardo, G. De Pietro, R. de Sangro, S. Dey, A. Di Canto, F. Di Capua, T. V. Dong, G. Dujany, P. Ecker, M. Eliachevitch, T. Ferber, F. Forti, E. Ganiev, A. Gaz, M. Gelb, J. Gemmler, R. Godang, P. Goldenzweig, E. Graziani, K. Hara, A. Hershenhorn, T. Higuchi, E. C. Hill, M. Hohmann, T. Humair, G. Inguglia, H. Junkerkalefeld, R. Karl, Y. Kato, T. Keck, C. Kiesling, C. H. Kim, S. Kohani, I. Komarov, T. M.G. Kraetzschmar, P. Križan, J. F. Krohn, T. Kuhr, J. Kumar, K. Kumara, S. Kurz, S. Lacaprara, C. La Licata, M. Laurenza, K. Lautenbach, S. C. Lee, K. Lieret, L. Li Gioi, Q. Y. Liu, S. Longo, M. Maggiora, E. Manoni, C. Marinas, A. Martini, F. Meier, M. Merola, F. Metzner, M. Milesi, K. Miyabayashi, G. B. Mohanty, F. Mueller, C. Murphy, E. R. Oxford, S. H. Park, A. Passeri, F. Pham, L. E. Piilonen, S. Pokharel, M. T. Prim, C. Pulvermacher, P. Rados, M. Ritter, A. Rostomyan, S. Sandilya, L. Santelj, Y. Sato, A. J. Schwartz, M. E. Sevior, A. Soffer, S. Spataro, R. Stroili, W. Sutcliffe, D. Tagnani, M. Takizawa, U. Tamponi, F. Tenchini, E. Torassa, P. Urquijo, L. Vitale, Y. Yusa, L. Zani, Q. D. Zhou, R. Žlebčík, A. Zupanc

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

We report on new flavor tagging algorithms developed to determine the quark-flavor content of bottom ([InlineMediaObject not available: see fulltext.]) mesons at Belle II. The algorithms provide essential inputs for measurements of quark-flavor mixing and charge-parity violation. We validate and evaluate the performance of the algorithms using hadronic [InlineMediaObject not available: see fulltext.] decays with flavor-specific final states reconstructed in a data set corresponding to an integrated luminosity of 62.8 fb- 1, collected at the [InlineEquation not available: see fulltext.] resonance with the Belle II detector at the SuperKEKB collider. We measure the total effective tagging efficiency to be εeff=(30.0±1.2(stat)±0.4(syst))%for a category-based algorithm and εeff=(28.8±1.2(stat)±0.4(syst))%for a deep-learning-based algorithm.

Original languageEnglish
Article number283
JournalEuropean Physical Journal C
Volume82
Issue number4
DOIs
StatePublished - Apr 2022

Funding

FundersFunder number
7th FrameworkPIEF-GA-2013-622527, 267104, 884719, 819127
GLORIAD
Horizon 2020 Marie Sklodowska-Curie700525, 822070
Israel Ministry of Science3-16543
SEP-CINVESTAV237
Science Committee of the Republic of Armenia20TTCG-1C010
Shanghai Pujiang Program18PJ1401000
TUBITAK ULAKBIM
National Science FoundationPHY-1807007, PHY-1913789
National Science Foundation
U.S. Department of EnergyDE-SC0021274, DE-SC0010007, DE-AC06-76RLO1830, DE-SC0010118, DE-SC0010504, DE-SC0012704, DE-SC0010073, DE-SC0009824, DE-SC0007983, DE-SC0009973, DE-SC0011784
U.S. Department of Energy
Alexander von Humboldt-Stiftung
Univerzita Karlova v PrazeSVV 260448, GAUK 404316
Univerzita Karlova v Praze
Canarie
Horizon 2020 Framework Programme947006
Horizon 2020 Framework Programme
Vietnam Academy of Science and TechnologyDL0000.05/21-23
Vietnam Academy of Science and Technology
Thailand Center of Excellence in Physics
Compute Canada
Natural Sciences and Engineering Research Council of Canada
European Research Council
Australian Research CouncilDP170102204, FT120100745, DP180102629, DP150103061, FT130100018, DP170102389, FT130100303
Australian Research Council
Department of Science and Technology, Ministry of Science and Technology, India
Department of Atomic Energy, Government of IndiaRTI 4002
Department of Atomic Energy, Government of India
Helmholtz-Gemeinschaft
Deutsche Forschungsgemeinschaft
Japan Society for the Promotion of Science16H06492, 18H05226, 18K03621, 26400255, 19H00682, 26220706, 16H03968, 17H01133, 17H05405, 16K05323, 18H03710, 16H03993
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology
United States-Israel Binational Science Foundation2016113
United States-Israel Binational Science Foundation
National Natural Science Foundation of China11521505, 11761141009, 11975076, 11575017, 11675166, 11705209
National Natural Science Foundation of China
Ministerstvo Školství, Mládeže a TělovýchovyLTT17020
Ministerstvo Školství, Mládeže a Tělovýchovy
Bundesministerium für Bildung und Forschung
Chinese Academy of SciencesQYZDJ-SSW-SLH011
Chinese Academy of Sciences
Austrian Science Fund31361-N36
Austrian Science Fund
Ministry of Education
Ministry of Higher Education, MalaysiaFOINS-296, CB-180023, CB-236394, CB-254409, CB-221329
Ministry of Higher Education, Malaysia
Generalitat Valenciana
Science and Technology Commission of Shanghai Municipality19ZR1403000
Science and Technology Commission of Shanghai Municipality
Ministry of Education and Science of the Russian Federation
Korea Institute of Science and Technology Information
Ministry of Science and TechnologyMOST107-2119-M-002-035-MY3, MOST106-2112-M-002-005-MY3
Ministry of Science and Technology
National Research Foundation of Korea2016R1D1A1B02012900, 2018R1A2B3003643, 2018R1D1A1B07047294, 2019R1I1A3A01058933, 2016R1D1A1B01010135, 2019K1A3A7A09033840, 2018R1A6A1A06024970
National Research Foundation of Korea
Israel Science Foundation2476/17
Israel Science Foundation
Instituto Nazionale di Fisica Nucleare
Max-Planck-Gesellschaft
Narodowe Centrum Nauki
Javna Agencija za Raziskovalno Dejavnost RSJ1-9124, P1-0135
Javna Agencija za Raziskovalno Dejavnost RS
Universiti Malaya
Ministerstwo Edukacji i Nauki
Centre National de la Recherche Scientifique
Akademi Sains Malaysia
National Research University Higher School of EconomicsS-0256-1438, S-0280-1439
National Research University Higher School of Economics
Ministry of Education and Science of Ukraine
Agencia Estatal de InvestigaciónCIDEGENT/2018/020, FPA2017-84445-P, FPA2014-55613-P
Agencia Estatal de Investigación
National Institute of Informatics
Institut National de Physique Nucléaire et de Physique des Particules
Bundesministerium für Bildung, Wissenschaft und Forschung
CAS Center for Excellence in Particle Physics
Liaoning Revitalization Talents ProgramXLYC1807135
Liaoning Revitalization Talents Program
Korea Research Environment Open Network

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