Publications associated with TORCH


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

Journal of High Energy Physics Springer Verlag 2018 (2018) 131

M Bjørn, SF Cheung, BR Gruberg Cazon, T Evans, T Hadavizadeh, N Harnew, TH Hancock, D Hill, PG Jalocha, MJJ John, NP Jurik, S Malde, AK Nandi, A Rollings, HL Pullen, M Vesterinen, G Veneziano, GR Wilkinson

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.].


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