First Observation of the Rare Purely Baryonic Decay B^{0}→pp[over ¯]
Affiliations
- 1 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 2 Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
- 3 H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
- 4 Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 5 University of Cincinnati, Cincinnati, Ohio, USA.
- 6 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 7 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 8 ICCUB, Universitat de Barcelona, Barcelona, Spain.
- 9 Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
- 10 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia.
- 11 Imperial College London, London, United Kingdom.
- 12 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 13 Sezione INFN di Padova, Padova, Italy.
- 14 LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France.
- 15 Center for High Energy Physics, Tsinghua University, Beijing, China.
- 16 Sezione INFN di Firenze, Firenze, Italy.
- 17 Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 18 Universita e INFN, Ferrara, Ferrara, Italy.
- 19 University of Maryland, College Park, Maryland, USA.
- 20 School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 21 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 22 Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France.
- 23 Institute for High Energy Physics (IHEP), Protvino, Russia.
- 24 Syracuse University, Syracuse, New York, USA.
- 25 Sezione INFN di Roma La Sapienza, Roma, Italy.
- 26 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 27 Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil (associated with Institution Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil).
- 28 Yandex School of Data Analysis, Moscow, Russia.
- 29 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia.
- 30 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 31 LAPP, Université Savoie Mont-Blanc, CNRS/IN2P3, Annecy-Le-Vieux, France.
- 32 Sezione INFN di Pisa, Pisa, Italy.
- 33 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
- 34 University of Chinese Academy of Sciences, Beijing, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).
- 35 Universita e INFN, Milano-Bicocca, Milano, Italy.
- 36 LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France.
- 37 Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy.
- 38 I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany.
- 39 Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
- 40 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 41 Sezione INFN di Bologna, Bologna, Italy.
- 42 University of Birmingham, Birmingham, United Kingdom.
- 43 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 44 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- 45 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 46 Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia.
- 47 Sezione INFN di Cagliari, Cagliari, Italy.
- 48 Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
- 49 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 50 School of Physics and Technology, Wuhan University, Wuhan, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).
- 51 Sezione INFN di Roma Tor Vergata, Roma, Italy.
- 52 Sezione INFN di Genova, Genova, Italy.
- 53 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 54 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 55 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 56 Sezione INFN di Bari, Bari, Italy.
- 57 AGH-University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 58 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).
- 59 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 60 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 61 Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia.
- 62 Sezione di Milano, Milano, Italy.
- 63 Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia-CSIC, Valencia, Spain (associated with Institution ICCUB, Universitat de Barcelona, Barcelona, Spain).
- 64 Institut für Physik, Universität Rostock, Rostock, Germany (associated with Institution Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 65 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands.
- 66 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 67 National Research Centre Kurchatov Institute, Moscow, Russia (associated with Institution Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- 68 School of Physics, University College Dublin, Dublin, Ireland.
- 69 Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with Institution LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France).
- 70 Van Swinderen Institute, University of Groningen, Groningen, The Netherlands (associated with Institution Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands).
- 71 National Research Tomsk Polytechnic University, Tomsk, Russia (associated with Institution Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- PMID: 29286678
- DOI: 10.1103/PhysRevLett.119.232001
First Observation of the Rare Purely Baryonic Decay B^{0}→pp[over ¯]
Authors
Affiliations
- 1 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 2 Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
- 3 H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
- 4 Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 5 University of Cincinnati, Cincinnati, Ohio, USA.
- 6 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 7 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 8 ICCUB, Universitat de Barcelona, Barcelona, Spain.
- 9 Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
- 10 Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia.
- 11 Imperial College London, London, United Kingdom.
- 12 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 13 Sezione INFN di Padova, Padova, Italy.
- 14 LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France.
- 15 Center for High Energy Physics, Tsinghua University, Beijing, China.
- 16 Sezione INFN di Firenze, Firenze, Italy.
- 17 Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 18 Universita e INFN, Ferrara, Ferrara, Italy.
- 19 University of Maryland, College Park, Maryland, USA.
- 20 School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 21 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 22 Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France.
- 23 Institute for High Energy Physics (IHEP), Protvino, Russia.
- 24 Syracuse University, Syracuse, New York, USA.
- 25 Sezione INFN di Roma La Sapienza, Roma, Italy.
- 26 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 27 Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil (associated with Institution Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil).
- 28 Yandex School of Data Analysis, Moscow, Russia.
- 29 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia.
- 30 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 31 LAPP, Université Savoie Mont-Blanc, CNRS/IN2P3, Annecy-Le-Vieux, France.
- 32 Sezione INFN di Pisa, Pisa, Italy.
- 33 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
- 34 University of Chinese Academy of Sciences, Beijing, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).
- 35 Universita e INFN, Milano-Bicocca, Milano, Italy.
- 36 LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France.
- 37 Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy.
- 38 I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany.
- 39 Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
- 40 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 41 Sezione INFN di Bologna, Bologna, Italy.
- 42 University of Birmingham, Birmingham, United Kingdom.
- 43 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 44 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- 45 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 46 Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia.
- 47 Sezione INFN di Cagliari, Cagliari, Italy.
- 48 Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
- 49 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 50 School of Physics and Technology, Wuhan University, Wuhan, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).
- 51 Sezione INFN di Roma Tor Vergata, Roma, Italy.
- 52 Sezione INFN di Genova, Genova, Italy.
- 53 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 54 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 55 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 56 Sezione INFN di Bari, Bari, Italy.
- 57 AGH-University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 58 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).
- 59 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 60 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 61 Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia.
- 62 Sezione di Milano, Milano, Italy.
- 63 Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia-CSIC, Valencia, Spain (associated with Institution ICCUB, Universitat de Barcelona, Barcelona, Spain).
- 64 Institut für Physik, Universität Rostock, Rostock, Germany (associated with Institution Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 65 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands.
- 66 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 67 National Research Centre Kurchatov Institute, Moscow, Russia (associated with Institution Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- 68 School of Physics, University College Dublin, Dublin, Ireland.
- 69 Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with Institution LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France).
- 70 Van Swinderen Institute, University of Groningen, Groningen, The Netherlands (associated with Institution Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands).
- 71 National Research Tomsk Polytechnic University, Tomsk, Russia (associated with Institution Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- PMID: 29286678
- DOI: 10.1103/PhysRevLett.119.232001
Abstract
The first observation of the decay of a B^{0} meson to a purely baryonic final state, B^{0}→pp[over ¯], is reported. The proton-proton collision data sample used was collected with the LHCb experiment at center-of-mass energies of 7 and 8 TeV and corresponds to an integrated luminosity of 3.0 fb^{-1}. The branching fraction is determined to be B(B^{0}→pp[over ¯])=(1.25±0.27±0.18)×10^{-8}, where the first uncertainty is statistical and the second systematic. The decay mode B^{0}→pp[over ¯] is the rarest decay of the B^{0} meson observed to date. The decay B_{s}^{0}→pp[over ¯] is also investigated. No signal is seen and the upper limit B(B_{s}^{0}→pp[over ¯])<1.5×10^{-8} at 90% confidence level is set on the branching fraction.
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