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

26 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
Ministry of Education
Narodowe Centrum Nauki
Institut National de Physique Nucléaire et de Physique des Particules
Korea Research Environment Open Network
Akademi Sains Malaysia
Universiti Malaya
National Institute of Informatics
Korea Institute of Science and Technology Information
Bundesministerium für Bildung, Wissenschaft und Forschung
Instituto Nazionale di Fisica Nucleare
Thailand Center of Excellence in Physics
Department of Science and Technology, Ministry of Science and Technology, India
Centre National de la Recherche Scientifique
Max-Planck-Gesellschaft
Bundesministerium für Bildung und Forschung
Ministry of Education and Science of Ukraine
Helmholtz-Gemeinschaft
Canarie
Deutsche Forschungsgemeinschaft
European Commission
Ministry of Education and Science of the Russian Federation
CAS Center for Excellence in Particle Physics
Natural Sciences and Engineering Research Council of Canada
Horizon 2020 Marie Sklodowska-Curie
TUBITAK ULAKBIM
Compute Canada
European Research Council
Ministerstwo Edukacji i Nauki
Generalitat Valenciana
GLORIAD
Alexander von Humboldt-Stiftung
Ministry of Education, Culture, Sports, Science and Technology
Ministry of Science and TechnologyMOST107-2119-M-002-035-MY3, MOST106-2112-M-002-005-MY3
Horizon 2020 Framework Programme947006, 700525, 822070, 267104, 884719, 1807007, 622527, 819127, PHY-1913789
National Research Foundation of Korea2016R1D1A1B02012900, 2018R1A2B3003643, 2018R1D1A1B07047294, 2019R1I1A3A01058933, 2016R1D1A1B01010135, 2019K1A3A7A09033840, 2018R1A6A1A06024970
Univerzita Karlova v PrazeSVV 260448, GAUK 404316
Austrian Science Fund31361-N36, P 31361
Department of Atomic Energy, Government of IndiaRTI 4002
Israel Science Foundation2476/17
Australian Research CouncilDP170102204, FT120100745, DP180102629, DP150103061, FT130100018, DP170102389, FT130100303
Science Committee of the Republic of Armenia20TTCG-1C010
United States-Israel Binational Science Foundation2016113
Ministry of Higher Education, MalaysiaFOINS-296, CB-180023, CB-236394, CB-254409, CB-221329
Javna Agencija za Raziskovalno Dejavnost RSJ1-9124, P1-0135
SEP-CINVESTAV237
Shanghai Pujiang Program18PJ1401000
Liaoning Revitalization Talents ProgramXLYC1807135
National Science FoundationPHY-1807007, 1807007, PHY-1913789
Israel Ministry of Science3-16543
National Research University Higher School of EconomicsS-0280-1439, S-0256-1438
Vietnam Academy of Science and TechnologyDL0000.05/21-23
Science and Technology Commission of Shanghai Municipality19ZR1403000
U.S. Department of EnergyDE-SC0021274, DE-SC0010007, DE-AC06-76RLO1830, DE-SC0010118, DE-SC0010504, DE-SC0012704, DE-SC0010073, DE-SC0009824, DE-SC0007983, DE-SC0011784, DE-SC0009973
Japan Society for the Promotion of Science26400255, 18K03621, 18H05226, 16H06492, 19H00682, 26220706, 17H01133, 16H03968, 17H05405, 16K05323, 18H03710, 16H03993
National Natural Science Foundation of China11521505, 11761141009, 11975076, 11575017, 11705209, 11675166
7th FrameworkPIEF-GA-2013-622527
Chinese Academy of SciencesQYZDJ-SSW-SLH011
Agencia Estatal de InvestigaciónCIDEGENT/2018/020, FPA2017-84445-P, FPA2014-55613-P
Ministerstvo Školství, Mládeže a TělovýchovyLTT17020

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