Enhanced Production of Λ_{b}^{0} Baryons in High-Multiplicity pp Collisions at sqrt[s]=13 TeV
Affiliations
- 1 Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
- 2 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 3 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 4 Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
- 5 Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
- 6 H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
- 7 Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom).
- 8 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 9 University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA).
- 10 Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 11 University of Cincinnati, Cincinnati, Ohio, USA.
- 12 INFN Laboratori Nazionali di Frascati, Frascati, Italy.
- 13 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 14 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 15 ICCUB, Universitat de Barcelona, Barcelona, Spain.
- 16 Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 17 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 18 LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France.
- 19 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 20 Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France.
- 21 School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China.
- 22 INFN Sezione di Firenze, Firenze, Italy.
- 23 Affiliated with an institute covered by a cooperation agreement with CERN.
- 24 INFN Sezione di Ferrara, Ferrara, Italy.
- 25 Syracuse University, Syracuse, New York, USA.
- 26 INFN Sezione di Milano-Bicocca, Milano, Italy.
- 27 University of Chinese Academy of Sciences, Beijing, China.
- 28 INFN Sezione di Roma Tor Vergata, Roma, Italy.
- 29 Consejo Nacional de Rectores (CONARE), San Jose, Costa Rica.
- 30 Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France.
- 31 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 32 Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France.
- 33 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 34 Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France.
- 35 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 36 Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 37 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
- 38 Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil (associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil).
- 39 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 40 I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany.
- 41 INFN Sezione di Pisa, Pisa, Italy.
- 42 Institute Of High Energy Physics (IHEP), Beijing, China.
- 43 INFN Sezione di Genova, Genova, Italy.
- 44 Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA.
- 45 DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain.
- 46 Università degli Studi di Padova, Università e INFN, Padova, Padova, Italy.
- 47 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 48 Imperial College London, London, United Kingdom.
- 49 School of Physics and Astronomy, Monash University, Melbourne, Australia.
- 50 Center for High Energy Physics, Tsinghua University, Beijing, China.
- 51 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China.
- 52 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- 53 School of Physics, University College Dublin, Dublin, Ireland.
- 54 INFN Sezione di Bari, Bari, Italy.
- 55 INFN Sezione di Bologna, Bologna, Italy.
- 56 INFN Sezione di Milano, Milano, Italy.
- 57 INFN Sezione di Cagliari, Monserrato, Italy.
- 58 INFN Sezione di Perugia, Perugia, Italy.
- 59 INFN Sezione di Roma La Sapienza, Roma, Italy.
- 60 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands.
- 61 AGH - University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 62 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 63 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 64 Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia - CSIC, Valencia, Spain.
- 65 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 66 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 67 University of Birmingham, Birmingham, United Kingdom.
- 68 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 69 University of Maryland, College Park, Maryland, USA.
- 70 School of Physics and Electronics, Hunan University, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China).
- 71 Guangdong Provincial Key Laboratory of Nuclear Science, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Institute of Quantum Matter, South China Normal University, Guangzhou, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
- 72 Lanzhou University, Lanzhou, China (associated with Institute Of High Energy Physics (IHEP), Beijing, China).
- 73 School of Physics and Technology, Wuhan University, Wuhan, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
- 74 Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France).
- 75 Universität Bonn - Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 76 Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland).
- 77 Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 78 Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 79 Tadeusz Kosciuszko Cracow University of Technology, Cracow, Poland (associated with Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland).
- 80 Departement de Physique Nucleaire (SPhN), Gif-Sur-Yvette, France.
- PMID: 38457697
- DOI: 10.1103/PhysRevLett.132.081901
Enhanced Production of Λ_{b}^{0} Baryons in High-Multiplicity pp Collisions at sqrt[s]=13 TeV
Authors
Affiliations
- 1 Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
- 2 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 3 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 4 Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
- 5 Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
- 6 H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
- 7 Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom).
- 8 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 9 University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA).
- 10 Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 11 University of Cincinnati, Cincinnati, Ohio, USA.
- 12 INFN Laboratori Nazionali di Frascati, Frascati, Italy.
- 13 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 14 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 15 ICCUB, Universitat de Barcelona, Barcelona, Spain.
- 16 Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 17 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 18 LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France.
- 19 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 20 Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France.
- 21 School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China.
- 22 INFN Sezione di Firenze, Firenze, Italy.
- 23 Affiliated with an institute covered by a cooperation agreement with CERN.
- 24 INFN Sezione di Ferrara, Ferrara, Italy.
- 25 Syracuse University, Syracuse, New York, USA.
- 26 INFN Sezione di Milano-Bicocca, Milano, Italy.
- 27 University of Chinese Academy of Sciences, Beijing, China.
- 28 INFN Sezione di Roma Tor Vergata, Roma, Italy.
- 29 Consejo Nacional de Rectores (CONARE), San Jose, Costa Rica.
- 30 Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France.
- 31 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 32 Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France.
- 33 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 34 Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France.
- 35 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 36 Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 37 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
- 38 Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil (associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil).
- 39 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 40 I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany.
- 41 INFN Sezione di Pisa, Pisa, Italy.
- 42 Institute Of High Energy Physics (IHEP), Beijing, China.
- 43 INFN Sezione di Genova, Genova, Italy.
- 44 Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA.
- 45 DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain.
- 46 Università degli Studi di Padova, Università e INFN, Padova, Padova, Italy.
- 47 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 48 Imperial College London, London, United Kingdom.
- 49 School of Physics and Astronomy, Monash University, Melbourne, Australia.
- 50 Center for High Energy Physics, Tsinghua University, Beijing, China.
- 51 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China.
- 52 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- 53 School of Physics, University College Dublin, Dublin, Ireland.
- 54 INFN Sezione di Bari, Bari, Italy.
- 55 INFN Sezione di Bologna, Bologna, Italy.
- 56 INFN Sezione di Milano, Milano, Italy.
- 57 INFN Sezione di Cagliari, Monserrato, Italy.
- 58 INFN Sezione di Perugia, Perugia, Italy.
- 59 INFN Sezione di Roma La Sapienza, Roma, Italy.
- 60 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands.
- 61 AGH - University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 62 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 63 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 64 Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia - CSIC, Valencia, Spain.
- 65 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 66 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 67 University of Birmingham, Birmingham, United Kingdom.
- 68 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 69 University of Maryland, College Park, Maryland, USA.
- 70 School of Physics and Electronics, Hunan University, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China).
- 71 Guangdong Provincial Key Laboratory of Nuclear Science, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Institute of Quantum Matter, South China Normal University, Guangzhou, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
- 72 Lanzhou University, Lanzhou, China (associated with Institute Of High Energy Physics (IHEP), Beijing, China).
- 73 School of Physics and Technology, Wuhan University, Wuhan, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
- 74 Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France).
- 75 Universität Bonn - Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 76 Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland).
- 77 Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 78 Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 79 Tadeusz Kosciuszko Cracow University of Technology, Cracow, Poland (associated with Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland).
- 80 Departement de Physique Nucleaire (SPhN), Gif-Sur-Yvette, France.
- PMID: 38457697
- DOI: 10.1103/PhysRevLett.132.081901
Abstract
The production rate of Λ_{b}^{0} baryons relative to B^{0} mesons in pp collisions at a center-of-mass energy sqrt[s]=13 TeV is measured by the LHCb experiment. The ratio of Λ_{b}^{0} to B^{0} production cross sections shows a significant dependence on both the transverse momentum and the measured charged-particle multiplicity. At low multiplicity, the ratio measured at LHCb is consistent with the value measured in e^{+}e^{-} collisions, and increases by a factor of ∼2 with increasing multiplicity. At relatively low transverse momentum, the ratio of Λ_{b}^{0} to B^{0} cross sections is higher than what is measured in e^{+}e^{-} collisions, but converges with the e^{+}e^{-} ratio as the momentum increases. These results imply that the evolution of heavy b quarks into final-state hadrons is influenced by the density of the hadronic environment produced in the collision. Comparisons with several models and implications for the mechanisms enforcing quark confinement are discussed.
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