Observation of the decay Bs 0 → ηc ϕ and evidence for Bs 0 → ηc π + π

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  • LHCb Collaboration

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External organisations

  • European Organization for Nuclear Research (CERN)
  • Universidad de Santiago de Compostela
  • LPC
  • University of Cincinnati
  • Technische Universität Dortmund
  • University of Glasgow
  • Institution Nikhef National Institute for Subatomic Physics
  • Petersburg Nuclear Physics Institute (PNPI)
  • Imperial College London
  • Universidade Federal Do Rio de Janeiro (UFRJ)
  • INFN Padova
  • IN2P3
  • Tsinghua University
  • Sezione INFN di Firenze
  • Laboratory of Photonics and Interfaces, Department de Chimie, Ecole Polytechnique Federale de Lausanne, CH-1015 Lausanne, Switzerland. ahmad@mpip-mainz.mpg.de
  • Department of Physics and Astronomy and INFN
  • Department of Biology and Evolution; University of Ferrara; Ferrara; Italy
  • University of Maryland, College Park, Maryland 20742 USA
  • University of Manchester
  • Ruprecht-Karls-Universität Heidelberg
  • CNRS/IN2P3
  • Institute for High Energy Physics (IHEP)
  • Syracuse University, Syracuse, New York 13244, USA
  • Universitat de Barcelona
  • Pontifícia Universidade Católica Do Rio de Janeiro (PUC-Rio)
  • Russian Academy of Science (LPI RAS)


A study of Bs 0 → ηcϕ and Bs 0 → ηcπ+π decays is performed using pp collision data corresponding to an integrated luminosity of 3.0 fb−1, collected with the LHCb detector in Run 1 of the LHC. The observation of the decay Bs 0 → ηcϕ is reported, where the ηc meson is reconstructed in the pp¯ , K+Kπ+π, π+ππ+π and K+KK+K decay modes and the ϕ(1020) in the K+K decay mode. The decay Bs 0 → J/ψϕ is used as a normalisation channel. Evidence is also reported for the decay Bs 0 → ηcπ+π, where the ηc meson is reconstructed in the pp¯ decay mode, using the decay Bs 0 → J/ψπ+π as a normalisation channel. The measured branching fractions are(Formula Presented.)where in each case the first uncertainty is statistical, the second systematic and the third uncertainty is due to the limited knowledge of the external branching fractions.[Figure not available: see fulltext.].


Original languageEnglish
Article number21
JournalJournal of High Energy Physics
Issue number7
Publication statusPublished - 1 Jul 2017


  • B physics, Branching fraction, Flavor physics, Hadron-Hadron scattering (experiments)

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