European Physical Journal C: Particles and Fields (Apr 2022)
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. Casarosa,
- C. 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
Affiliations
- F. Abudinén
- INFN Sezione di Trieste
- N. Akopov
- Alikhanyan National Science Laboratory
- A. Aloisio
- INFN Sezione di Napoli
- V. Babu
- Deutsches Elektronen-Synchrotron
- Sw. Banerjee
- University of Louisville
- M. Bauer
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie
- J. V. Bennett
- University of Mississippi
- F. U. Bernlochner
- University of Bonn
- M. Bessner
- University of Hawaii
- S. Bettarini
- INFN Sezione di Pisa
- T. Bilka
- Faculty of Mathematics and Physics, Charles University
- S. Bilokin
- Ludwig Maximilians University
- D. Biswas
- University of Louisville
- D. Bodrov
- Higher School of Economics (HSE)
- J. Borah
- Indian Institute of Technology Guwahati
- M. Bračko
- J. Stefan Institute
- P. Branchini
- INFN Sezione di Roma Tre
- A. Budano
- INFN Sezione di Roma Tre
- M. Campajola
- INFN Sezione di Napoli
- G. Casarosa
- INFN Sezione di Pisa
- C. Cecchi
- INFN Sezione di Perugia
- R. Cheaib
- Deutsches Elektronen-Synchrotron
- V. Chekelian
- Max-Planck-Institut für Physik
- C. Chen
- Iowa State University
- Y. Q. Chen
- Hunan Normal University
- H. -E. Cho
- Department of Physics and Institute of Natural Sciences, Hanyang University
- S. Cunliffe
- Deutsches Elektronen-Synchrotron
- G. De Nardo
- INFN Sezione di Napoli
- G. De Pietro
- INFN Sezione di Roma Tre
- R. de Sangro
- INFN Laboratori Nazionali di Frascati
- S. Dey
- School of Physics and Astronomy, Tel Aviv University
- A. Di Canto
- Brookhaven National Laboratory, Upton
- F. Di Capua
- INFN Sezione di Napoli
- T. V. Dong
- Institute of Theoretical and Applied Research (ITAR), Duy Tan University
- G. Dujany
- Université de Strasbourg, CNRS, IPHC, UMR 7178
- P. Ecker
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie
- M. Eliachevitch
- University of Bonn
- T. Ferber
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie
- F. Forti
- INFN Sezione di Pisa
- E. Ganiev
- INFN Sezione di Trieste
- A. Gaz
- INFN Sezione di Padova
- M. Gelb
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie
- J. Gemmler
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie
- R. Godang
- University of South Alabama
- P. Goldenzweig
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie
- E. Graziani
- INFN Sezione di Roma Tre
- K. Hara
- The Graduate University for Advanced Studies (SOKENDAI)
- A. Hershenhorn
- University of British Columbia
- T. Higuchi
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo
- E. C. Hill
- University of British Columbia
- M. Hohmann
- School of Physics, University of Melbourne
- T. Humair
- Max-Planck-Institut für Physik
- G. Inguglia
- Institute of High Energy Physics
- H. Junkerkalefeld
- University of Bonn
- R. Karl
- Deutsches Elektronen-Synchrotron
- Y. Kato
- Graduate School of Science, Nagoya University
- T. Keck
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie
- C. Kiesling
- Max-Planck-Institut für Physik
- C. -H. Kim
- Department of Physics and Institute of Natural Sciences, Hanyang University
- S. Kohani
- University of Hawaii
- I. Komarov
- Deutsches Elektronen-Synchrotron
- T. M. G. Kraetzschmar
- Max-Planck-Institut für Physik
- P. Križan
- J. Stefan Institute
- J. F. Krohn
- School of Physics, University of Melbourne
- T. Kuhr
- Ludwig Maximilians University
- J. Kumar
- Carnegie Mellon University
- K. Kumara
- Wayne State University
- S. Kurz
- Deutsches Elektronen-Synchrotron
- S. Lacaprara
- INFN Sezione di Padova
- C. La Licata
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo
- M. Laurenza
- INFN Sezione di Roma Tre
- K. Lautenbach
- Aix Marseille Université, CNRS/IN2P3, CPPM
- S. C. Lee
- Kyungpook National University
- K. Lieret
- Ludwig Maximilians University
- L. Li Gioi
- Max-Planck-Institut für Physik
- Q. Y. Liu
- Deutsches Elektronen-Synchrotron
- S. Longo
- Deutsches Elektronen-Synchrotron
- M. Maggiora
- INFN Sezione di Torino
- E. Manoni
- INFN Sezione di Perugia
- C. Marinas
- Instituto de Fisica Corpuscular
- A. Martini
- Deutsches Elektronen-Synchrotron
- F. Meier
- Duke University
- M. Merola
- INFN Sezione di Napoli
- F. Metzner
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie
- M. Milesi
- School of Physics, University of Melbourne
- K. Miyabayashi
- Nara Women’s University
- G. B. Mohanty
- Tata Institute of Fundamental Research
- F. Mueller
- Max-Planck-Institut für Physik
- C. Murphy
- Kavli Institute for the Physics and Mathematics of the Universe (WPI), University of Tokyo
- E. R. Oxford
- Carnegie Mellon University
- S. -H. Park
- High Energy Accelerator Research Organization (KEK)
- A. Passeri
- INFN Sezione di Roma Tre
- F. Pham
- School of Physics, University of Melbourne
- L. E. Piilonen
- Virginia Polytechnic Institute and State University
- S. Pokharel
- University of Mississippi
- M. T. Prim
- University of Bonn
- C. Pulvermacher
- Institut für Experimentelle Teilchenphysik, Karlsruher Institut für Technologie
- P. Rados
- Deutsches Elektronen-Synchrotron
- M. Ritter
- Ludwig Maximilians University
- A. Rostomyan
- Deutsches Elektronen-Synchrotron
- S. Sandilya
- Indian Institute of Technology Hyderabad
- L. Santelj
- J. Stefan Institute
- Y. Sato
- Department of Physics, Tohoku University
- A. J. Schwartz
- University of Cincinnati
- M. E. Sevior
- School of Physics, University of Melbourne
- A. Soffer
- School of Physics and Astronomy, Tel Aviv University
- S. Spataro
- INFN Sezione di Torino
- R. Stroili
- INFN Sezione di Padova
- W. Sutcliffe
- University of Bonn
- D. Tagnani
- INFN Sezione di Roma Tre
- M. Takizawa
- J-PARC Branch, KEK Theory Center, High Energy Accelerator Research Organization (KEK)
- U. Tamponi
- INFN Sezione di Torino
- F. Tenchini
- INFN Sezione di Pisa
- E. Torassa
- INFN Sezione di Padova
- P. Urquijo
- School of Physics, University of Melbourne
- L. Vitale
- INFN Sezione di Trieste
- Y. Yusa
- Niigata University
- L. Zani
- Aix Marseille Université, CNRS/IN2P3, CPPM
- Q. D. Zhou
- Graduate School of Science, Nagoya University
- R. Žlebčík
- Faculty of Mathematics and Physics, Charles University
- A. Zupanc
- J. Stefan Institute
- DOI
- https://doi.org/10.1140/epjc/s10052-022-10180-9
- Journal volume & issue
-
Vol. 82,
no. 4
pp. 1 – 29
Abstract
Abstract We report on new flavor tagging algorithms developed to determine the quark-flavor content of bottom ( ) 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 decays with flavor-specific final states reconstructed in a data set corresponding to an integrated luminosity of 62.8 fb $$^{-1}$$ - 1 , collected at the resonance with the Belle II detector at the SuperKEKB collider. We measure the total effective tagging efficiency to be $$\begin{aligned} \varepsilon _\mathrm{eff} = \big (30.0 \pm 1.2(\text {stat}) \pm 0.4(\text {syst})\big )\% \end{aligned}$$ ε eff = ( 30.0 ± 1.2 ( stat ) ± 0.4 ( syst ) ) % for a category-based algorithm and $$\begin{aligned} \varepsilon _\mathrm{eff} = \big (28.8 \pm 1.2(\text {stat}) \pm 0.4(\text {syst})\big )\% \end{aligned}$$ ε eff = ( 28.8 ± 1.2 ( stat ) ± 0.4 ( syst ) ) % for a deep-learning-based algorithm.
