Study of Bs0 → J/ψπ+πK+K decays

LHCb Collaboration

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The decays Bs0 → J/ψπ+πK+K are studied using a data set corresponding to an integrated luminosity of 9 fb−1, collected with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV. The decays Bs0 → J / ψK∗0∗0 and Bs0 → χc1(3872)K+K, where the K+Kpair does not originate from a ϕ meson, are observed for the first time. Precise measurements of the ratios of branching fractions between intermediate χc1(3872)ϕ, J / ψK∗0∗0, ψ(2S)ϕ and χc1(3872)K+K states are reported. A structure, denoted as X(4740), is observed in the J/ψϕ mass spectrum and, assuming a Breit-Wigner parameterisation, its mass and width are determined to be


where the first uncertainty is statistical and the second is systematic. In addition, the most precise single measurement of the mass of the Bs0 meson is performed and gives a value of


Original languageEnglish
Article number24
Number of pages34
JournalJournal of High Energy Physics
Issue number2
Publication statusPublished - 2 Feb 2021


  • B physics
  • Branching fraction
  • Hadron-Hadron scattering (experiments)
  • Quarkonium
  • Spectroscopy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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