A search for B+→D+sK+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 13TeV with the LHCb experiment. A significant signal is observed for the first time and the branching fraction is determined to be (B+→D+sK+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+→D+sD⎯⎯⎯0. A search is also performed for the pure annihilation decay B+→D+sφ. No significant signal is observed and a limit of (B+→D+sφ)<4.9×10−7 (4.2×10−7) is set on the branching fraction at 95% (90%) confidence level.
First observation of B+ → Ds+K+K− decays and a search for B+ → Ds+ϕ decays
Calabrese, R.;Capriotti, L.;Fiorini, M.;Luppi, E.;Minzoni, L.;Pappalardo, L. L.;Tomassetti, L.;
2018
Abstract
A search for B+→D+sK+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 13TeV with the LHCb experiment. A significant signal is observed for the first time and the branching fraction is determined to be (B+→D+sK+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+→D+sD⎯⎯⎯0. A search is also performed for the pure annihilation decay B+→D+sφ. No significant signal is observed and a limit of (B+→D+sφ)<4.9×10−7 (4.2×10−7) is set on the branching fraction at 95% (90%) confidence level.File | Dimensione | Formato | |
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