Observation of the decay B¯s0→χc2 K+ K− in the ϕ mass region

LHCb Collaboration

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The B¯s0→χc2K+K− decay mode is observed and its branching fraction relative to the corresponding χ c1 decay mode, in a ±15 MeV/c 2 window around the ϕ mass, is found to be ℬ(B¯s0→χc2K+K−)ℬ(B¯s0→χc1K+K−)=(17.1±3.1±0.4±0.9)%, where the first uncertainty is statistical, the second systematic and the third due to the knowledge of the branching fractions of radiative χ c decays. The decay mode B¯s0→χc1K+K− allows the B s 0 mass to be measured as m(Bs0)=5366.83±0.25±0.27MeV/c2, where the first uncertainty is statistical and the second systematic. A combination of this result with other LHCb determinations of the B s 0 mass is made.[Figure not available: see fulltext.]

Original languageEnglish
Article number191
JournalJournal of High Energy Physics
Issue number8
Publication statusPublished - 29 Aug 2018

Bibliographical note

The LHCb collaboration, Aaij, R., Adeva, B. et al. J. High Energ. Phys. (2018) 2018: 191. https://doi.org/10.1007/JHEP08(2018)191


  • B physics
  • Flavor physics
  • Hadron-Hadron scattering (experiments)

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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