Study of charmonium and charmonium-like contributions in B+ → J/ψηK+ decays

Mick Mulder, K. De Bruyn, C. J. G. Onderwater, M. van Veghel, LHCb Collaboration

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A study of B+ → J/ψηK+ decays, followed by J/ψ → μ+μ− and η → γγ, is performed using a dataset collected with the LHCb detector in proton-proton collisions at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. The J/ψη mass spectrum is investigated for contributions from charmonia and charmonium-like states. Evidence is found for the B+ → (ψ2(3823) → J/ψη)K+ and B+ → (ψ(4040) → J/ψη)K+ decays with significance of 3.4 and 4.7 standard deviations, respectively. This constitutes the first evidence for the ψ2(3823) → J/ψη decay.
Original languageEnglish
Article number46
Number of pages29
JournalJournal of High Energy Physics
Issue number4
Publication statusPublished - 8-Apr-2022


  • B Physics
  • Branching fraction
  • Hadron-Hadron Scattering
  • Quarkonium
  • X(3872)

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