First Observation of the B[over ¯]_{s}^{0}→Λ_{c}^{+}Λ[over ¯]_{c}^{-} Decay and Evidence for the B[over ¯]^{0}→Λ_{c}^{+}Λ[over ¯]_{c}^{-} Decay
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 Syracuse University, Syracuse, New York, USA.
- 6 Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
- 7 H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
- 8 Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom).
- 9 Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France.
- 10 University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA).
- 11 Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 12 AGH-University of Krakow, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 13 INFN Laboratori Nazionali di Frascati, Frascati, Italy.
- 14 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 15 Faculty of Physics, Vilnius University, Vilnius, Lithuania (associated with Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany).
- 16 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 17 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 18 Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Sorbonne Université, CNRS/IN2P3, Paris, France.
- 19 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 20 School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China.
- 21 INFN Sezione di Firenze, Firenze, Italy.
- 22 INFN Sezione di Ferrara, Ferrara, Italy.
- 23 Universidade da Coruña, A Coruña, Spain.
- 24 INFN Sezione di Milano-Bicocca, Milano, Italy.
- 25 University of Chinese Academy of Sciences, Beijing, China.
- 26 Université Paris-Saclay, Centre d'Etudes de Saclay (CEA), IRFU, Gif-Sur-Yvette, France.
- 27 INFN Sezione di Roma Tor Vergata, Roma, Italy.
- 28 Consejo Nacional de Rectores (CONARE), San Jose, Costa Rica.
- 29 Authors affiliated with an institute formerly covered by a cooperation agreement with CERN.
- 30 Aix-Marseille University, CNRS/IN2P3, CPPM, Marseille, France.
- 31 Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 32 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 33 Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France.
- 34 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 35 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 36 Ruhr Universitaet Bochum, Fakultaet f. Physik und Astronomie, Bochum, Germany (associated with Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany).
- 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 Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 40 INFN Sezione di Bologna, Bologna, Italy.
- 41 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 42 Institute of High Energy Physics (IHEP), Beijing, China.
- 43 Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland).
- 44 INFN Sezione di Pisa, Pisa, Italy.
- 45 INFN Sezione di Genova, Genova, Italy.
- 46 INFN Sezione di Roma La Sapienza, Roma, Italy.
- 47 La Salle, Universitat Ramon Llull, Barcelona, Spain.
- 48 INFN Sezione di Padova, Padova, Italy.
- 49 Taras Schevchenko University of Kyiv, Faculty of Physics, Kyiv, Ukraine (associated with Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France).
- 50 Universität Bonn-Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany.
- 51 Imperial College London, London, United Kingdom.
- 52 Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France.
- 53 Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA.
- 54 Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 55 School of Physics and Astronomy, Monash University, Melbourne, Australia.
- 56 Tadeusz Kosciuszko Cracow University of Technology, Cracow, Poland (associated with Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland).
- 57 Ohio State University, Columbus, Ohio, USA (associated with Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA).
- 58 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 59 INFN Sezione di Cagliari, Monserrato, Italy.
- 60 School of Physics and Technology, Wuhan University, Wuhan, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China).
- 61 ICCUB, Universitat de Barcelona, Barcelona, Spain.
- 62 INFN Sezione di Milano, Milano, Italy.
- 63 Department of Engineering Physics, Tsinghua University, Beijing, China.
- 64 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 65 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 66 INFN Sezione di Bari, Bari, Italy.
- 67 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 68 University of Cincinnati, Cincinnati, Ohio, USA.
- 69 Hunan University, School of Physics and Electronics, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China).
- 70 Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 71 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China.
- 72 School of Physics, University College Dublin, Dublin, Ireland.
- 73 State Key Laboratory of Nuclear Physics and Technology, South China Normal University, Guangzhou, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China).
- 74 INFN Sezione di Perugia, Perugia, Italy.
- 75 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 76 Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia-CSIC, Valencia, Spain.
- 77 University of Maryland, College Park, Maryland, USA.
- 78 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 79 Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany.
- 80 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 81 I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany.
- 82 Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Sorbonne Université, CNRS/IN2P3, Paris, France).
- 83 Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic (associated with Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom).
- 84 School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom.
- 85 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands.
- 86 Henan Normal University, Xinxiang, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China).
- 87 Lanzhou University, Lanzhou, China (associated with Institute of High Energy Physics (IHEP), Beijing, China).
- 88 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- 89 Universidad Andres Bello, Santiago, Chile (associated with Physik-Institut, Universität Zürich, Zürich, Switzerland).
- PMID: 41765847
- DOI: 10.1103/cxn3-8t4g
First Observation of the B[over ¯]_{s}^{0}→Λ_{c}^{+}Λ[over ¯]_{c}^{-} Decay and Evidence for the B[over ¯]^{0}→Λ_{c}^{+}Λ[over ¯]_{c}^{-} Decay
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 Syracuse University, Syracuse, New York, USA.
- 6 Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
- 7 H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
- 8 Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom).
- 9 Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France.
- 10 University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA).
- 11 Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 12 AGH-University of Krakow, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 13 INFN Laboratori Nazionali di Frascati, Frascati, Italy.
- 14 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 15 Faculty of Physics, Vilnius University, Vilnius, Lithuania (associated with Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany).
- 16 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 17 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 18 Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Sorbonne Université, CNRS/IN2P3, Paris, France.
- 19 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 20 School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China.
- 21 INFN Sezione di Firenze, Firenze, Italy.
- 22 INFN Sezione di Ferrara, Ferrara, Italy.
- 23 Universidade da Coruña, A Coruña, Spain.
- 24 INFN Sezione di Milano-Bicocca, Milano, Italy.
- 25 University of Chinese Academy of Sciences, Beijing, China.
- 26 Université Paris-Saclay, Centre d'Etudes de Saclay (CEA), IRFU, Gif-Sur-Yvette, France.
- 27 INFN Sezione di Roma Tor Vergata, Roma, Italy.
- 28 Consejo Nacional de Rectores (CONARE), San Jose, Costa Rica.
- 29 Authors affiliated with an institute formerly covered by a cooperation agreement with CERN.
- 30 Aix-Marseille University, CNRS/IN2P3, CPPM, Marseille, France.
- 31 Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 32 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 33 Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France.
- 34 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 35 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 36 Ruhr Universitaet Bochum, Fakultaet f. Physik und Astronomie, Bochum, Germany (associated with Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany).
- 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 Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 40 INFN Sezione di Bologna, Bologna, Italy.
- 41 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 42 Institute of High Energy Physics (IHEP), Beijing, China.
- 43 Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland).
- 44 INFN Sezione di Pisa, Pisa, Italy.
- 45 INFN Sezione di Genova, Genova, Italy.
- 46 INFN Sezione di Roma La Sapienza, Roma, Italy.
- 47 La Salle, Universitat Ramon Llull, Barcelona, Spain.
- 48 INFN Sezione di Padova, Padova, Italy.
- 49 Taras Schevchenko University of Kyiv, Faculty of Physics, Kyiv, Ukraine (associated with Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France).
- 50 Universität Bonn-Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany.
- 51 Imperial College London, London, United Kingdom.
- 52 Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France.
- 53 Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA.
- 54 Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 55 School of Physics and Astronomy, Monash University, Melbourne, Australia.
- 56 Tadeusz Kosciuszko Cracow University of Technology, Cracow, Poland (associated with Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland).
- 57 Ohio State University, Columbus, Ohio, USA (associated with Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA).
- 58 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 59 INFN Sezione di Cagliari, Monserrato, Italy.
- 60 School of Physics and Technology, Wuhan University, Wuhan, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China).
- 61 ICCUB, Universitat de Barcelona, Barcelona, Spain.
- 62 INFN Sezione di Milano, Milano, Italy.
- 63 Department of Engineering Physics, Tsinghua University, Beijing, China.
- 64 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 65 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 66 INFN Sezione di Bari, Bari, Italy.
- 67 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 68 University of Cincinnati, Cincinnati, Ohio, USA.
- 69 Hunan University, School of Physics and Electronics, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China).
- 70 Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 71 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China.
- 72 School of Physics, University College Dublin, Dublin, Ireland.
- 73 State Key Laboratory of Nuclear Physics and Technology, South China Normal University, Guangzhou, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China).
- 74 INFN Sezione di Perugia, Perugia, Italy.
- 75 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 76 Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia-CSIC, Valencia, Spain.
- 77 University of Maryland, College Park, Maryland, USA.
- 78 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 79 Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany.
- 80 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 81 I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany.
- 82 Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Sorbonne Université, CNRS/IN2P3, Paris, France).
- 83 Institute of Physics of the Czech Academy of Sciences, Prague, Czech Republic (associated with Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom).
- 84 School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom.
- 85 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands.
- 86 Henan Normal University, Xinxiang, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China).
- 87 Lanzhou University, Lanzhou, China (associated with Institute of High Energy Physics (IHEP), Beijing, China).
- 88 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- 89 Universidad Andres Bello, Santiago, Chile (associated with Physik-Institut, Universität Zürich, Zürich, Switzerland).
- PMID: 41765847
- DOI: 10.1103/cxn3-8t4g
Abstract
A search is presented for the two-body charmed baryonic decays, B[over ¯]_{(s)}^{0}→Λ_{c}^{+}Λ[over ¯]_{c}^{-}, using a data sample collected by the LHCb experiment during 2011-2012 and 2015-2018, corresponding to an integrated luminosity of 9 fb^{-1}. The first observation of the B[over ¯]_{s}^{0}→Λ_{c}^{+}Λ[over ¯]_{c}^{-} decay is reported with 6.2σ significance along with 4.3σ evidence for the B[over ¯]^{0}→Λ_{c}^{+}Λ[over ¯]_{c}^{-} decay. The branching fractions are measured to be B(B[over ¯]^{0}→Λ_{c}^{+}Λ[over ¯]_{c}^{-})=(1.01_{-0.28}^{+0.27}±0.08±0.15)×10^{-5} and B(B[over ¯]_{s}^{0}→Λ_{c}^{+}Λ[over ¯]_{c}^{-})=(5.0±1.3±0.5±0.8)×10^{-5}, where the first uncertainty is statistical, the second systematic, and the third due to external inputs. These results provide novel experimental inputs for the theoretical framework describing two-body baryonic decays of B mesons via W-emission and W-exchange mechanisms.
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