Study of Bs0 → J/ψπ+πK+K decays

The Lhcb Collaboration

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


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∗ 0K ¯ ∗ 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∗ 0K ¯ ∗ 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 mX(4740)=4741±6±6MeV/c2,ΓX(4740)=53±15±11MeV, 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 mBs0=5366.98±0.07±0.13MeV/c2. [Figure not available: see fulltext.]

Original languageEnglish (US)
Article number24
JournalJournal of High Energy Physics
Issue number2
StatePublished - Feb 2021


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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


Dive into the research topics of 'Study of Bs0 → J/ψπ+πK+K decays'. Together they form a unique fingerprint.

Cite this