Observation of New Ξ_{c}^{0} Baryons Decaying to Λ_{c}^{+}K^{-}
Affiliations
- 1 Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
- 2 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 3 Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
- 4 Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
- 5 H. H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
- 6 Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 7 University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA).
- 8 INFN Sezione di Milano, Milano, Italy.
- 9 Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA.
- 10 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 11 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 12 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 13 ICCUB, Universitat de Barcelona, Barcelona, Spain.
- 14 Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, Russia.
- 15 Imperial College London, London, United Kingdom.
- 16 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 17 Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France.
- 18 INFN Sezione di Firenze, Firenze, Italy.
- 19 Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 20 INFN Sezione di Ferrara, Ferrara, Italy.
- 21 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 22 Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia, Protvino, Russia.
- 23 Syracuse University, Syracuse, New York, USA.
- 24 Yandex School of Data Analysis, Moscow, Russia.
- 25 Aix Marseille Université, CNRS/IN2P3, CPPM, Marseille, France.
- 26 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 27 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
- 28 Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 29 INFN Sezione di Genova, Genova, Italy.
- 30 National University of Science and Technology "MISIS," Moscow, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia].
- 31 I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany.
- 32 INFN Sezione di Pisa, Pisa, Italy.
- 33 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 34 INFN Sezione di Cagliari, Monserrato, Italy.
- 35 Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia.
- 36 INFN Laboratori Nazionali di Frascati, Frascati, Italy.
- 37 LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France.
- 38 Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
- 39 INFN Sezione di Padova, Padova, Italy.
- 40 INFN Sezione di Bologna, Bologna, Italy.
- 41 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 42 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 43 University of Birmingham, Birmingham, United Kingdom.
- 44 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 45 INFN Sezione di Roma La Sapienza, Roma, Italy.
- 46 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 47 National Research University Higher School of Economics, Moscow, Russia (associated with Yandex School of Data Analysis, Moscow, Russia).
- 48 Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia.
- 49 University of Maryland, College Park, Maryland, USA.
- 50 Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS), Moscow, Russia.
- 51 School of Physics and Technology, Wuhan University, Wuhan, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
- 52 INFN Sezione di Milano-Bicocca, Milano, Italy.
- 53 University of Chinese Academy of Sciences, Beijing, China.
- 54 INFN Sezione di Roma Tor Vergata, Roma, Italy.
- 55 Institute of High Energy Physics (IHEP), Beijing, China.
- 56 Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France.
- 57 Center for High Energy Physics, Tsinghua University, Beijing, China.
- 58 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 59 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 60 INFN Sezione di Bari, Bari, Italy.
- 61 Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 62 AGH-University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 63 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China.
- 64 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 65 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 66 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 67 School of Physics and Astronomy, Monash University, Melbourne, Australia (associated with Department of Physics, University of Warwick, Coventry, United Kingdom).
- 68 School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China.
- 69 Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia-CSIC, Valencia, Spain.
- 70 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].
- 71 Laboratory of Mathematical and Subatomic Physics, Constantine, Algeria [associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil].
- 72 Guangdong Provencial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
- 73 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands.
- 74 National Research Tomsk Polytechnic University, Tomsk, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia].
- 75 National Research Centre Kurchatov Institute, Moscow, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia].
- 76 School of Physics, University College Dublin, Dublin, Ireland.
- 77 University of Cincinnati, Cincinnati, Ohio, USA.
- 78 Institut für Physik, Universität Rostock, Rostock, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 79 Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France).
- 80 Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 81 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- PMID: 32567908
- DOI: 10.1103/PhysRevLett.124.222001
Observation of New Ξ_{c}^{0} Baryons Decaying to Λ_{c}^{+}K^{-}
Authors
Affiliations
- 1 Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
- 2 Physik-Institut, Universität Zürich, Zürich, Switzerland.
- 3 Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
- 4 Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
- 5 H. H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
- 6 Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
- 7 University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA).
- 8 INFN Sezione di Milano, Milano, Italy.
- 9 Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA.
- 10 Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
- 11 European Organization for Nuclear Research (CERN), Geneva, Switzerland.
- 12 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
- 13 ICCUB, Universitat de Barcelona, Barcelona, Spain.
- 14 Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, Russia.
- 15 Imperial College London, London, United Kingdom.
- 16 Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
- 17 Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France.
- 18 INFN Sezione di Firenze, Firenze, Italy.
- 19 Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
- 20 INFN Sezione di Ferrara, Ferrara, Italy.
- 21 Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
- 22 Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia, Protvino, Russia.
- 23 Syracuse University, Syracuse, New York, USA.
- 24 Yandex School of Data Analysis, Moscow, Russia.
- 25 Aix Marseille Université, CNRS/IN2P3, CPPM, Marseille, France.
- 26 Department of Physics, University of Warwick, Coventry, United Kingdom.
- 27 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
- 28 Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
- 29 INFN Sezione di Genova, Genova, Italy.
- 30 National University of Science and Technology "MISIS," Moscow, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia].
- 31 I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany.
- 32 INFN Sezione di Pisa, Pisa, Italy.
- 33 National Center for Nuclear Research (NCBJ), Warsaw, Poland.
- 34 INFN Sezione di Cagliari, Monserrato, Italy.
- 35 Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia.
- 36 INFN Laboratori Nazionali di Frascati, Frascati, Italy.
- 37 LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France.
- 38 Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
- 39 INFN Sezione di Padova, Padova, Italy.
- 40 INFN Sezione di Bologna, Bologna, Italy.
- 41 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
- 42 Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
- 43 University of Birmingham, Birmingham, United Kingdom.
- 44 Department of Physics, University of Oxford, Oxford, United Kingdom.
- 45 INFN Sezione di Roma La Sapienza, Roma, Italy.
- 46 Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
- 47 National Research University Higher School of Economics, Moscow, Russia (associated with Yandex School of Data Analysis, Moscow, Russia).
- 48 Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia.
- 49 University of Maryland, College Park, Maryland, USA.
- 50 Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS), Moscow, Russia.
- 51 School of Physics and Technology, Wuhan University, Wuhan, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
- 52 INFN Sezione di Milano-Bicocca, Milano, Italy.
- 53 University of Chinese Academy of Sciences, Beijing, China.
- 54 INFN Sezione di Roma Tor Vergata, Roma, Italy.
- 55 Institute of High Energy Physics (IHEP), Beijing, China.
- 56 Université Grenoble Alpes, Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France.
- 57 Center for High Energy Physics, Tsinghua University, Beijing, China.
- 58 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
- 59 Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
- 60 INFN Sezione di Bari, Bari, Italy.
- 61 Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 62 AGH-University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
- 63 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China.
- 64 Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
- 65 NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
- 66 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
- 67 School of Physics and Astronomy, Monash University, Melbourne, Australia (associated with Department of Physics, University of Warwick, Coventry, United Kingdom).
- 68 School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China.
- 69 Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia-CSIC, Valencia, Spain.
- 70 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].
- 71 Laboratory of Mathematical and Subatomic Physics, Constantine, Algeria [associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil].
- 72 Guangdong Provencial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou, China (associated with Center for High Energy Physics, Tsinghua University, Beijing, China).
- 73 Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands.
- 74 National Research Tomsk Polytechnic University, Tomsk, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia].
- 75 National Research Centre Kurchatov Institute, Moscow, Russia [associated with Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia].
- 76 School of Physics, University College Dublin, Dublin, Ireland.
- 77 University of Cincinnati, Cincinnati, Ohio, USA.
- 78 Institut für Physik, Universität Rostock, Rostock, Germany (associated with Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
- 79 Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France).
- 80 Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).
- 81 Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
- PMID: 32567908
- DOI: 10.1103/PhysRevLett.124.222001
Abstract
The Λ_{c}^{+}K^{-} mass spectrum is studied with a data sample of pp collisions at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.6 fb^{-1} collected by the LHCb experiment. Three Ξ_{c}^{0} states are observed with a large significance and their masses and natural widths are measured to be m[Ξ_{c}(2923)^{0}]=2923.04±0.25±0.20±0.14 MeV, Γ[Ξ_{c}(2923)^{0}]=7.1±0.8±1.8 MeV, m[Ξ_{c}(2939)^{0}]=2938.55±0.21±0.17±0.14 MeV, Γ[Ξ_{c}(2939)^{0}]=10.2±0.8±1.1 MeV, m[Ξ_{c}(2965)^{0}]=2964.88±0.26±0.14±0.14 MeV, Γ[Ξ_{c}(2965)^{0}]=14.1±0.9±1.3 MeV, where the uncertainties are statistical, systematic, and due to the limited knowledge of the Λ_{c}^{+} mass. The Ξ_{c}(2923)^{0} and Ξ_{c}(2939)^{0} baryons are new states. The Ξ_{c}(2965)^{0} state is in the vicinity of the known Ξ_{c}(2970)^{0} baryon; however, their masses and natural widths differ significantly.