First observation of B+ -> D-s(+) K+ K- decays and a search for B+ -> D-s(+) phi decays

Journal article

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 ℬ(B+→Ds+K+K−)=(7.1±0.5±0.6±0.7)×10−6,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+→Ds+D¯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+→Ds+ϕ) < 4.9×10−7(4.2×10−7) is set on the branching fraction at 95% (90%) confidence level.[Figure not available: see fulltext.].

Authors: LHCb Collaboration; Bjørn, M; Cheung, S; Evans, T; Gruberg Cazon, B

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Springer Verlag
• Journal: Journal of High Energy Physics
• Volume: 2018
• Issue: 1
• Article number: 131
• Publication date: 2018-01-26
• Acceptance date: 2018-01-18
• DOI: 10.1007/JHEP01(2018)131
• EISSN: 1029-8479
• ISSN: 1029-8479
• Keywords: rare decay; branching fraction; B physics; hadron-hadron scattering (experiments)