Inclusive B-meson flavour-tagging algorithm at LHCb

Journal of High Energy Physics, vol. 2025

Abstract

A bstract A new algorithm is developed to identify the flavour of neutral B mesons at production in pp collisions by utilising all tracks from the hadronisation process. The algorithm is calibrated separately for B 0 and $$ {B}_s^0 $$ B s 0 mesons using B 0 → J / ψK + π − and $$ {B}_s^0\to {D}_s^{-}{\pi}^{+} $$ B s 0 → D s − π + decays from pp collision data collected by the LHCb experiment at a centre-of-mass energy of 13 TeV. This new algorithm improves the tagging power by 35% for B 0 mesons and 20% for $$ {B}_s^0 $$ B s 0 mesons when compared to the combined performance of the existing LHCb flavour-tagging algorithms.

Authors 56

1. A. S. W. Abdelmotteleb

   University of Warwick

   Affiliation as printed

   University of Warwick

   Department of Physics, University of Warwick, Coventry, United Kingdom

2. Carlos Abellán Beteta

   University of Zurich

   Affiliation as printed

   Universität Zürich

3. T. Ackernley

   University of Liverpool

   Affiliation as printed

   University of Liverpool

   Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom

4. A. A. Adefisoye

   Syracuse University

   Affiliation as printed

   Syracuse University

   Syracuse University, Syracuse, NY, United States

5. B. Adeva

   Universidade de Santiago de Compostela

   Affiliation as printed

   Universidade de Santiago de Compostela

6. P. Adlarson

   Uppsala University

   Affiliation as printed

   Uppsala University

   Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden

7. C. Agapopoulou

   Centre National de la Recherche Scientifique · Université Paris-Saclay · Institut National de Physique Nucléaire et de Physique des Particules · Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

   Affiliation as printed

   Université Paris-Saclay, CNRS/IN2P3, IJCLab

8. C. Aidala

   University of Michigan

   Affiliation as printed

   University of Michigan

   University of Michigan, Ann Arbor, MI, United States

9. Z. Ajaltouni

   Centre National de la Recherche Scientifique · Université Clermont Auvergne · Laboratoire de Physique de Clermont Auvergne · Institut National de Physique Nucléaire et de Physique des Particules

   Affiliation as printed

   Université Clermont Auvergne, CNRS/IN2P3, LPC

   LPC - Laboratoire de Physique de Clermont (Campus Universitaire des Cézeaux, 4 Avenue Blaise Pascal, TSA 60026, CS 6002, 63178 Aubière Cedex - France)

10. S. Akar

    Centre National de la Recherche Scientifique · Université Clermont Auvergne · Laboratoire de Physique de Clermont Auvergne · Institut National de Physique Nucléaire et de Physique des Particules

    Affiliation as printed

    Université Clermont Auvergne, CNRS/IN2P3, LPC

    LPC - Laboratoire de Physique de Clermont (Campus Universitaire des Cézeaux, 4 Avenue Blaise Pascal, TSA 60026, CS 6002, 63178 Aubière Cedex - France)

11. K. Carvalho Akiba

    National Institute for Subatomic Physics

    Affiliation as printed

    Nikhef National Institute for Subatomic Physics

    Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands

12. P. Albicocco

    Istituto Nazionale di Fisica Nucleare · Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati

    Affiliation as printed

    INFN Laboratori Nazionali di Frascati

    INFN Laboratori Nazionali di Frascati, Frascati, Italy

13. J. Albrecht

    TU Dortmund University · Lamarr Institute for Machine Learning and Artificial Intelligence

    Affiliation as printed

    Lamarr Institute for Machine Learning and Artificial Intelligence

    Technische Universität Dortmund

14. R. Amalric

    Centre National de la Recherche Scientifique · Sorbonne Université · Laboratoire de Physique Nucléaire et de Hautes Énergies · Institut National de Physique Nucléaire et de Physique des Particules

    Affiliation as printed

    LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3

    LPNHE (UMR_7585) - Laboratoire de Physique Nucléaire et de Hautes Énergies (Barre 12-22, 1er étage 4 Place Jussieu 75252 Paris Cedex 05 - France)

15. S. Amato

    Universidade Federal do Rio de Janeiro

    Affiliation as printed

    Universidade Federal do Rio de Janeiro (UFRJ)

    Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil

16. Liupan An

    Peking University

    Affiliation as printed

    Peking University

17. L. Anderlini

    Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

    Affiliation as printed

    INFN Sezione di Firenze

    INFN Sezione di Firenze, Firenze, Italy

18. M. Andersson

    University of Zurich

    Affiliation as printed

    Universität Zürich

19. S. Arguedas Cuendis

    Consejo Nacional de Rectores · European Organization for Nuclear Research

    Affiliation as printed

    Consejo Nacional de Rectores (CONARE)

    European Organization for Nuclear Research (CERN)

    Consejo Nacional de Rectores (CONARE), San Jose, Costa Rica

20. E. Aslanides

    Centre National de la Recherche Scientifique · Aix-Marseille Université · Centre de physique des particules de Marseille · Institut National de Physique Nucléaire et de Physique des Particules

    Affiliation as printed

    Aix Marseille Univ, CNRS/IN2P3, CPPM

    Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France

    CPPM - Centre de Physique des Particules de Marseille (163, avenue de Luminy - Case 902 - 13288 Marseille cedex 09 - France)

21. Rita Ataíde da Silva

    École Polytechnique Fédérale de Lausanne

    Affiliation as printed

    Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL)

22. M. Atzeni

    Massachusetts Institute of Technology

    Affiliation as printed

    Massachusetts Institute of Technology

    Massachusetts Institute of Technology, Cambridge, MA, United States

23. Juliette Authier

    Centre National de la Recherche Scientifique · École Polytechnique · Institut National de Physique Nucléaire et de Physique des Particules · Institut Polytechnique de Paris · Laboratoire Leprince-Ringuet

    Affiliation as printed

    Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris

    Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France

24. D. Bacher

    University of Oxford

    Affiliation as printed

    University of Oxford

    Department of Physics, University of Oxford, Oxford, United Kingdom

25. I. Bachiller

    École Polytechnique Fédérale de Lausanne

    Affiliation as printed

    Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL)

26. V. Balagura

    Centre National de la Recherche Scientifique · École Polytechnique · Institut National de Physique Nucléaire et de Physique des Particules · Institut Polytechnique de Paris · Laboratoire Leprince-Ringuet

    Affiliation as printed

    Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris

    Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France

27. Zachary Baldwin

    Ruhr University Bochum

    Affiliation as printed

    Ruhr Universitaet Bochum, Fakultaet f. Physik und Astronomie

    Ruhr Universitaet Bochum, Fakultaet f. Physik und Astronomie, Bochum, Germany

28. Luca Balzani

    TU Dortmund University

    Affiliation as printed

    Technische Universität Dortmund

29. Haoran Bao

    University of Chinese Academy of Sciences

    Affiliation as printed

    University of Chinese Academy of Sciences

    University of Chinese Academy of Sciences, Beijing, China

30. S. Barsuk

    Centre National de la Recherche Scientifique · Université Paris-Saclay · Institut National de Physique Nucléaire et de Physique des Particules · Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

    Affiliation as printed

    Université Paris-Saclay, CNRS/IN2P3, IJCLab

31. Justin Bartz

    Syracuse University

    Affiliation as printed

    Syracuse University

    Syracuse University, Syracuse, NY, United States

32. S. Bashir

    AGH University of Krakow

    Affiliation as printed

    AGH — University of Krakow, Faculty of Physics and Applied Computer Science

33. Piera Battista

    Centre National de la Recherche Scientifique · Université Paris-Saclay · Institut National de Physique Nucléaire et de Physique des Particules · Laboratoire de Physique des 2 Infinis Irène Joliot-Curie

    Affiliation as printed

    Université Paris-Saclay, CNRS/IN2P3, IJCLab

34. A. Bay

    École Polytechnique Fédérale de Lausanne

    Affiliation as printed

    Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL)

35. M. Becker

    TU Dortmund University

    Affiliation as printed

    Technische Universität Dortmund

36. I. Bediaga

    Centro Brasileiro de Pesquisas Físicas

    Affiliation as printed

    Centro Brasileiro de Pesquisas Físicas (CBPF)

37. Noah Albin Behling

    TU Dortmund University

    Affiliation as printed

    Technische Universität Dortmund

38. K. Belous

    Institute of High Energy Physics

    Affiliation as printed

    Institute Of High Energy Physics (IHEP), Beijing, China

39. I. Belov

    Istituto Nazionale di Fisica Nucleare, Sezione di Genova

    Affiliation as printed

    INFN Sezione di Genova

    INFN Sezione di Genova, Genova, Italy

40. I. Belyaev

    Istituto Nazionale di Fisica Nucleare, Sezione di Roma I

    Affiliation as printed

    INFN Sezione di Roma La Sapienza

    INFN Sezione di Roma La Sapienza, Roma, Italy

41. G. Bencivenni

    Istituto Nazionale di Fisica Nucleare · Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati

    Affiliation as printed

    INFN Laboratori Nazionali di Frascati

    INFN Laboratori Nazionali di Frascati, Frascati, Italy

42. E. Ben-Haim

    Centre National de la Recherche Scientifique · Sorbonne Université · Laboratoire de Physique Nucléaire et de Hautes Énergies · Institut National de Physique Nucléaire et de Physique des Particules

    Affiliation as printed

    LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3

43. Alexander Berezhnoy
44. C. Betancourt

    University of Zurich

    Affiliation as printed

    Universität Zürich

45. F. Betti

    University of Edinburgh

    Affiliation as printed

    University of Edinburgh

    School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom

46. J. Bex

    University of Cambridge

    Affiliation as printed

    University of Cambridge

    Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom

47. Ia. Bezshyiko

    University of Zurich

    Affiliation as printed

    Universität Zürich

48. J. Bhom

    Institute of Nuclear Physics, Polish Academy of Sciences

    Affiliation as printed

    Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences

49. M. S. Bieker

    University of Bonn

    Affiliation as printed

    Universität Bonn — Helmholtz-Institut für Strahlen und Kernphysik

50. N. V. Biesuz

    Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara

    Affiliation as printed

    INFN Sezione di Ferrara

    INFN Sezione di Ferrara, Ferrara, Italy

51. P. Billoir

    Centre National de la Recherche Scientifique · Sorbonne Université · Laboratoire de Physique Nucléaire et de Hautes Énergies · Institut National de Physique Nucléaire et de Physique des Particules

    Affiliation as printed

    LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3

52. Alice Biolchini

    National Institute for Subatomic Physics

    Affiliation as printed

    Nikhef National Institute for Subatomic Physics

    Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands

53. M. Birch

    Imperial College London

    Affiliation as printed

    Imperial College London

    Imperial College London, London, United Kingdom

54. F. C. R. Bishop

    Centre National de la Recherche Scientifique · Laboratoire d’Annecy de Physique des Particules · Institut National de Physique Nucléaire et de Physique des Particules · Université Savoie Mont Blanc

    Affiliation as printed

    Université Savoie Mont Blanc, CNRS, IN2P3-LAPP

    LAPP - Laboratoire d'Annecy de Physique des Particules (9 Chemin de Bellevue - BP 110 - 74941 Annecy-le-Vieux CEDEX - France - France)

55. A. Bizzeti

    University of Modena and Reggio Emilia · Istituto Nazionale di Fisica Nucleare, Sezione di Firenze

    Affiliation as printed

    INFN Sezione di Firenze

    Università di Modena e Reggio Emilia

    INFN Sezione di Firenze, Firenze, Italy

56. Thomas Blake

    University of Victoria · University of Warwick

    Affiliation as printed

    University of Victoria

    University of Warwick

    Department of Physics, University of Warwick, Coventry, United Kingdom