First observation of B+→ D+s K+K decays and a search for B+ → D+s φ decays

LHCb Collaboration

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A search for B+ → D s + K+K decays is performed using pp collision data corresponding to an integrated luminosity of 4.8 fb−1, collected at centre-of-mass energies of 7, 8 and 13 TeV with the LHCb experiment. A significant signal is observed for the first time and the branching fraction is determined to be


where the first uncertainty is statistical, the second systematic and the third due to the uncertainty on the branching fraction of the normalisation mode B+→D+sD¯¯¯¯0

. A search is also performed for the pure annihilation decay B+ → D s + ϕ. No significant signal is observed and a limit of

B(B+→D+sϕ)<4.9×10−7(4.2×10−7) is set on the branching fraction at 95% (90%) confidence level.
Original languageEnglish
Article number131
Number of pages22
JournalJournal of High Energy Physics
Issue number1
Early online date26 Jan 2018
Publication statusPublished - Jan 2018


  • B physics
  • Branching fraction
  • Hadron-Hadron scattering (experiments)
  • Rare decay


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