Study of B0s → J/ψπ+π−K+K− decays

LHCb collaboration

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

The decays B0s → J/ψπ+π−K+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 B0s → J/ψK∗0K∗0 and B0s → χc1(3872)K+K−, where the K+K− pair 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 ± 6 MeV/c2 ,
ΓX(4740) = 53 ± 15 ± 11 MeV ,
where the first uncertainty is statistical and the second is systematic. In addition, the most precise single measurement of the mass of the B0s meson is performed and gives a value of
mB0s = 5366.98 ± 0.07 ± 0.13 MeV/c2.
Original languageEnglish
Article number24
Pages (from-to)1-33
Number of pages33
Journal Journal of High Energy Physics
Issue number2
Publication statusPublished - 2 Feb 2021

Keywords / Materials (for Non-textual outputs)

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


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