Determination of f_s/f_d for 7 TeV pp collisions and a measurement of the branching fraction of the decay Bd->D-K+

Abstract

The relative abundance of the three decay modes $B_d\to D^{-}{K}^{+}$, $B_d\to D^{-}{\pi }^{+}$ and $B_s\to D_s^{-}{\pi }^{+}$ produced in 7 TeV $pp$ collisions at the LHC is determined from data corresponding to an integrated luminosity of 35 pb${}^{-1}$. The branching fraction of $B_d\to D^{-}{K}^{+}$ is found to be $\mathcal{B}({\mathcal{B}}_d\to {\mathcal{D}}^{-}{\mathcal{K}}^{+})=(2.01\pm 0.18^{\text{stat}}\pm 0.14^{\text{syst}})\times 10^{-4}$. The ratio of fragmentation fractions \fsfdt is determined through the relative abundance of $B_s\to D_s^{-}{\pi }^{+}$ to $B_d\to D^{-}{K}^{+}$ and $B_d\to D^{-}{\pi }^{+}$, leading to $f_s/f_d=0.253\pm 0.017\pm 0.017\pm 0.020$, where the uncertainties are statistical, systematic, and theoretical respectively.

Submitted to PRL (7 pages, 2 Figures, 1 Table); Physical Review Letters, Vol.107, No.21, 2011

References in corpus (1)

• Tests of Factorization and SU(3) Relations in B Decays into Heavy-Light Final States

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