First observation of the decay Bc+to → J/ψ K+

The LHCb Collaboration

Research output: Contribution to journalArticleResearchpeer-review

36 Citations (Scopus)


The decay Bc+to → J/ψ K+ is observed for the first time using a data sample, corresponding to an integrated luminosity of 1.0 fb-1, collected by the LHCb experiment in pp collisions at a centre-of-mass energy of 7 TeV. A yield of 46 ± 12 events is reported, with a significance of 5.0 standard deviations. The ratio of the branching fraction of Bc+to → J/ψ K+ to that of Bc+to → J/ψ K+ is measured to be 0.069 ± 0.019 ± 0.005, where the first uncertainty is statistical and the second is systematic.

Original languageEnglish
Article number75
Number of pages14
JournalJournal of High Energy Physics
Issue number9
Publication statusPublished - 13 Sep 2013
Externally publishedYes


  • B physics
  • Branching fraction
  • Hadron-Hadron Scattering

Cite this