Observation of the doubly Cabibbo-suppressed decay Ξ c + → pϕ

The Lhcb Collaboration

Research output: Contribution to JournalArticleAcademicpeer-review


The doubly Cabibbo-suppressed decay Ξ c + → pϕ with ϕ → K + K is observed for the first time, with a statistical significance of more than fifteen standard deviations. The data sample used in this analysis corresponds to an integrated luminosity of 2 fb −1 recorded with the LHCb detector in pp collisions at a centre-of-mass energy of 8 TeV. The ratio of branching fractions between the decay Ξ c + → pϕ and the singly Cabibbo-suppressed decay Ξ c + → pK π + is measured to beℬ(Ξc+→pϕ)ℬ(Ξc+→pK−π+)=(19.8±0.7±0.9±0.2)×10−3, where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the ϕ → K + K branching fraction.[Figure not available: see fulltext.]

Original languageEnglish
Article number84
Pages (from-to)1-18
Number of pages18
JournalJournal of High Energy Physics
Issue number4
Early online date10 Apr 2019
Publication statusPublished - Apr 2019


We express our gratitude to our colleagues in the CERN accelerator departments for the excellent performance of the LHC. We thank the technical and administrative staff at the LHCb institutes. We acknowledge support from CERN and from the national agencies: CAPES, CNPq, FAPERJ and FINEP (Brazil); MOST and NSFC (China); CNRS/IN2P3 (France); BMBF, DFG and MPG (Germany); INFN (Italy); NWO (Netherlands); MNiSW and NCN (Poland); MEN/IFA (Romania); MSHE (Russia); MinECo (Spain); SNSF and SER (Switzerland); NASU (Ukraine); STFC (United Kingdom); NSF (U.S.A.). We acknowledge the computing resources that are provided by CERN, IN2P3 (France), KIT and DESY (Germany), INFN (Italy), SURF (Netherlands), PIC (Spain), GridPP (United Kingdom), RRCKI and Yandex LLC (Russia), CSCS (Switzerland), IFIN-HH (Romania), CBPF (Brazil), PL-GRID (Poland) and OSC (U.S.A.). We are indebted to the communities behind the multiple open-source software packages on which we depend. Individual groups or members have received support from AvH Foundation (Germany); EPLANET, Marie Sklo dowska-Curie Actions and ERC (European Union); ANR, Labex P2IO and OCEVU, and Région Auvergne-Rhône-Alpes (France); Key Research Program of Frontier Sciences of CAS, CAS PIFI, and the Thousand Talents Program (China); RFBR, RSF and Yandex LLC (Russia); GVA, XuntaGal and GENCAT (Spain); the Royal Society and the Leverhulme Trust (United Kingdom); Laboratory Directed Research and Development program of LANL (U.S.A.). 51 Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom 52 Department of Physics, University of Warwick, Coventry, United Kingdom 53 STFC Rutherford Appleton Laboratory, Didcot, United Kingdom 54 School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom 55 School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom 56 Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom 57 Imperial College London, London, United Kingdom 58 School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom 59 Department of Physics, University of Oxford, Oxford, United Kingdom 60 Massachusetts Institute of Technology, Cambridge, MA, United States 61 University of Cincinnati, Cincinnati, OH, United States 62 University of Maryland, College Park, MD, United States 63 Syracuse University, Syracuse, NY, United States 64 Laboratory of Mathematical and Subatomic Physics , Constantine, Algeria, associated to2 65 Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil, associated to2 66 University of Chinese Academy of Sciences, Beijing, China, associated to3 67 South China Normal University, Guangzhou, China, associated to3 68 School of Physics and Technology, Wuhan University, Wuhan, China, associated to3 69 Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China, associated to3 70 Departamento de Fisica , Universidad Nacional de Colombia, Bogota, Colombia, associated to9 71 Institut für Physik, Universität Rostock, Rostock, Germany, associated to13 72 Van Swinderen Institute, University of Groningen, Groningen, Netherlands, associated to28 73 National Research Centre Kurchatov Institute, Moscow, Russia, associated to35 74 National University of Science and Technology “MISIS”, Moscow, Russia, associated to35 75 National Research Tomsk Polytechnic University, Tomsk, Russia, associated to35 76 Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia — CSIC, Valencia, Spain, associated to42 77 H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom, Bristol, United Kingdom 78 University of Michigan, Ann Arbor, United States, associated to63 79 Los Alamos National Laboratory (LANL), Los Alamos, United States, associated to63

FundersFunder number
Not addedST/J004332/1, ST/N000250/1, ST/K003410/1, 1796908, ST/N000331/1, ST/L003163/1, ST/N000242/1
AvH Foundation
Key Research Program of Frontier Sciences of CAS
Marie Sklo dowska-Curie Actions
Yandex LLC
National Science Foundation
Laboratory Directed Research and Development
Los Alamos National Laboratory
School of Energy Resources, University of Wyoming
College of Arts and Sciences, University of Nebraska-Lincoln
Science and Technology Facilities CouncilST/N000234/1
Leverhulme Trust
Royal Society
European Research Council
Deutsche Forschungsgemeinschaft
Agence Nationale de la Recherche
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung166208
National Natural Science Foundation of China
Russian Foundation for Basic Research
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Bundesministerium für Bildung und Forschung
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Generalitat Valenciana
Conselho Nacional de Desenvolvimento Científico e Tecnológico
Ministry of Science and Technology
Instituto Nazionale di Fisica Nucleare
Narodowe Centrum Nauki
Ministerstwo Nauki i Szkolnictwa Wyższego
Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro
National Academy of Sciences of Ukraine
Financiadora de Estudos e Projetos
Russian Science Foundation
Région Auvergne-Rhône-Alpes
Recruitment Program of Global Experts


    • Branching fraction
    • Charm physics
    • Flavor physics
    • Hadron-Hadron scattering (experiments)


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