The decay mode Bs0→Ds∓K± allows for one of the theoretically cleanest measurements of the CKM angle γ through the study of time-dependent CP violation. This paper reports a measurement of its branching fraction relative to the Cabibbo-favoured mode Bs0→Ds−π+ based on a data sample corresponding to 0.37 fb−1 of proton-proton collisions at s=7TeV collected in 2011 with the LHCb detector. In addition, the ratio of B meson production fractions f s /f d , determined from semileptonic decays, together with the known branching fraction of the control channel B 0 → D −π+, is used to perform an absolute measurement of the branching fractions: BBs0→Ds−π+=2.95±0.05±0.17−0.22+0.18×10−3,\hfillBBs0→Ds∓K±=1.90±0.12±0.13−0.14+0.12×10−4,\hfill where the first uncertainty is statistical, the second the experimental systematic uncertainty, and the third the uncertainty due to f s /f d .

Measurements of the branching fractions of the decays $ B_s^0 \to D_s^{ \mp }{K^{\pm }} $ and $ B_s^0 \to D_s^{ - }{\pi^{ + }} $

CARDINALE, ROBERTA;FONTANELLI, FLAVIO;PATRIGNANI, CLAUDIA;PETROLINI, ALESSANDRO;SANNINO, MARIO;
2012-01-01

Abstract

The decay mode Bs0→Ds∓K± allows for one of the theoretically cleanest measurements of the CKM angle γ through the study of time-dependent CP violation. This paper reports a measurement of its branching fraction relative to the Cabibbo-favoured mode Bs0→Ds−π+ based on a data sample corresponding to 0.37 fb−1 of proton-proton collisions at s=7TeV collected in 2011 with the LHCb detector. In addition, the ratio of B meson production fractions f s /f d , determined from semileptonic decays, together with the known branching fraction of the control channel B 0 → D −π+, is used to perform an absolute measurement of the branching fractions: BBs0→Ds−π+=2.95±0.05±0.17−0.22+0.18×10−3,\hfillBBs0→Ds∓K±=1.90±0.12±0.13−0.14+0.12×10−4,\hfill where the first uncertainty is statistical, the second the experimental systematic uncertainty, and the third the uncertainty due to f s /f d .
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/534925
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