Observation of J/ψp Resonances Consistent with Pentaquark States in Λ_{b}^{0}→J/ψK^{-}p Decays
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 Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
- 5 Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 6 CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France.
- 7 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 8 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 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 University of Cincinnati, Cincinnati, Ohio, USA.
- 13 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 14 Sezione INFN di Padova, Padova, Italy.
- 15 LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France.
- 16 Center for High Energy Physics, Tsinghua University, Beijing, China.
- 17 Sezione INFN di Firenze, Firenze, Italy.
- 18 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 19 Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 20 Sezione INFN di Ferrara, Ferrara, Italy.
- 21 University of Maryland, College Park, Maryland, USA.
- 22 School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 23 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- 24 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 25 Institute for High Energy Physics (IHEP), Protvino, Russia.
- 26 Syracuse University, Syracuse, New York, USA.
- 27 Sezione INFN di Roma La Sapienza, Roma, Italy.
- 28 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 29 Universitat de Barcelona, Barcelona, Spain.
- 30 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).
- 31 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 32 LAPP, Université Savoie Mont-Blanc, CNRS/IN2P3, Annecy-Le-Vieux, France.
- 33 Sezione INFN di Pisa, Pisa, Italy.
- 34 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
- 35 Sezione INFN di Milano Bicocca, Milano, Italy.
- 36 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia.
- 37 LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France.
- 38 Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy.
- 39 Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
- 40 University of Birmingham, Birmingham, United Kingdom.
- 41 Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia.
- 42 Sezione INFN di Cagliari, Cagliari, Italy.
- 43 Sezione INFN di Bologna, Bologna, Italy.
- 44 Sezione INFN di Roma Tor Vergata, Roma, Italy.
- 45 Sezione INFN di Genova, Genova, Italy.
- 46 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 47 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 48 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 49 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 50 Sezione INFN di Milano, Milano, Italy.
- 51 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 52 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 53 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 54 Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia.
- 55 AGH - University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 56 Institut für Physik, Universität Rostock, Rostock, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 57 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 58 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands.
- 59 National Research Centre Kurchatov Institute, Moscow, Russia (associated with Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- 60 Yandex School of Data Analysis, Moscow, Russia (associated with Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- 61 Instituto de Fisica Corpuscular (IFIC), Universitat de Valencia-CSIC, Valencia, Spain (associated with Universitat de Barcelona, Barcelona, Spain).
- 62 School of Physics, University College Dublin, Dublin, Ireland.
- 63 Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France).
- 64 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 65 Van Swinderen Institute, University of Groningen, Groningen, The Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands).
- 66 Sezione INFN di Bari, Bari, Italy.
- 67 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
- PMID: 26317714
- DOI: 10.1103/PhysRevLett.115.072001
Observation of J/ψp Resonances Consistent with Pentaquark States in Λ_{b}^{0}→J/ψK^{-}p Decays
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 Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
- 5 Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 6 CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France.
- 7 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 8 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 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 University of Cincinnati, Cincinnati, Ohio, USA.
- 13 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 14 Sezione INFN di Padova, Padova, Italy.
- 15 LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France.
- 16 Center for High Energy Physics, Tsinghua University, Beijing, China.
- 17 Sezione INFN di Firenze, Firenze, Italy.
- 18 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 19 Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 20 Sezione INFN di Ferrara, Ferrara, Italy.
- 21 University of Maryland, College Park, Maryland, USA.
- 22 School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 23 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- 24 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 25 Institute for High Energy Physics (IHEP), Protvino, Russia.
- 26 Syracuse University, Syracuse, New York, USA.
- 27 Sezione INFN di Roma La Sapienza, Roma, Italy.
- 28 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 29 Universitat de Barcelona, Barcelona, Spain.
- 30 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).
- 31 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 32 LAPP, Université Savoie Mont-Blanc, CNRS/IN2P3, Annecy-Le-Vieux, France.
- 33 Sezione INFN di Pisa, Pisa, Italy.
- 34 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
- 35 Sezione INFN di Milano Bicocca, Milano, Italy.
- 36 Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia.
- 37 LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France.
- 38 Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy.
- 39 Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
- 40 University of Birmingham, Birmingham, United Kingdom.
- 41 Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia.
- 42 Sezione INFN di Cagliari, Cagliari, Italy.
- 43 Sezione INFN di Bologna, Bologna, Italy.
- 44 Sezione INFN di Roma Tor Vergata, Roma, Italy.
- 45 Sezione INFN di Genova, Genova, Italy.
- 46 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 47 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 48 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 49 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 50 Sezione INFN di Milano, Milano, Italy.
- 51 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 52 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 53 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 54 Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia.
- 55 AGH - University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 56 Institut für Physik, Universität Rostock, Rostock, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 57 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 58 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands.
- 59 National Research Centre Kurchatov Institute, Moscow, Russia (associated with Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- 60 Yandex School of Data Analysis, Moscow, Russia (associated with Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
- 61 Instituto de Fisica Corpuscular (IFIC), Universitat de Valencia-CSIC, Valencia, Spain (associated with Universitat de Barcelona, Barcelona, Spain).
- 62 School of Physics, University College Dublin, Dublin, Ireland.
- 63 Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France).
- 64 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 65 Van Swinderen Institute, University of Groningen, Groningen, The Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands).
- 66 Sezione INFN di Bari, Bari, Italy.
- 67 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
- PMID: 26317714
- DOI: 10.1103/PhysRevLett.115.072001
Abstract
Observations of exotic structures in the J/ψp channel, which we refer to as charmonium-pentaquark states, in Λ_{b}^{0}→J/ψK^{-}p decays are presented. The data sample corresponds to an integrated luminosity of 3 fb^{-1} acquired with the LHCb detector from 7 and 8 TeV pp collisions. An amplitude analysis of the three-body final state reproduces the two-body mass and angular distributions. To obtain a satisfactory fit of the structures seen in the J/ψp mass spectrum, it is necessary to include two Breit-Wigner amplitudes that each describe a resonant state. The significance of each of these resonances is more than 9 standard deviations. One has a mass of 4380±8±29 MeV and a width of 205±18±86 MeV, while the second is narrower, with a mass of 4449.8±1.7±2.5 MeV and a width of 39±5±19 MeV. The preferred J^{P} assignments are of opposite parity, with one state having spin 3/2 and the other 5/2.
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