Study of η − η mixing from measurement of B (s)0 → J/ψη(′) decay rates

The Lhcb Collaboration

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Abstract: A study of B and Bs meson decays into J/ψ η and J/ψ η final states is performed using a data set of proton-proton collisions at centre-of-mass energies of 7 and 8 TeV, collected by the LCHb experiment and corresponding to 3.0 fb−1 of integrated luminosity. The decay B0 → J/ψ η is observed for the first time. The following ratios of branching fractions are measured: (Formula Presented) where the third uncertainty is related to the present knowledge of fs/fd, the ratio between the probabilities for a b quark to form a Bs or a B0 meson. The branching fraction ratios are used to determine the parameters of η − η meson mixing. In addition, the first evidence for the decay Bs → ψ(2S)η is reported, and the relative branching fraction is measured, (Formula Presented) where the third uncertainty is due to the limited knowledge of the branching fractions of J/ψ and ψ(2S) mesons.

Original languageEnglish (US)
Article number24
Pages (from-to)1-24
Number of pages24
JournalJournal of High Energy Physics
Issue number1
StatePublished - 2015


  • B physics
  • Branching fraction
  • Hadron-Hadron Scattering
  • QCD
  • Spectroscopy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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