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Measurements of the branching fractions of the decays B°s → D∓s K± and B°s → D¯sπ+
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LHCb Collaboration (Including: Back, J. J., Dossett, D., Gershon, T. J., Harrison, P. F., Kreps, Michal, Latham, Thomas, Pilar, T., Poluektov, Anton, Reid, Matthew M., Silva Coutinho, R., Whitehead, M. (Mark) and Williams, M. P.). (2012) Measurements of the branching fractions of the decays B°s → D∓s K± and B°s → D¯sπ+. Journal of High Energy Physics, Volume 2012 (Issue 6 ). Article number 64. doi:10.1007/JHEP06(2012)115
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WRAP_Back_10.1007_JHEP06(2012)115.pdf - Published Version Available under License Creative Commons Attribution. Download (947Kb) | Preview |
Official URL: http://dx.doi.org/10.1007/JHEP06(2012)115
Abstract
The decay mode B°s → D∓s 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 B°s → D¯sπ+ 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 fs/fd, determined from semileptonic decays, together with the known branching fraction of the control channel B°s → D¯sπ+ is used to perform an absolute measurement of the branching fractions: B(B°s → D¯sπ+) = (2.95 ± 0.05 ± 0.17 -0.22 +0.18) × 10¯³ ; B(B°s → D∓s K±) = (1.90 ± 0.12 ± 0.13 -0.14 +0.12) × 10¯4 ; 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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