Determination of fs/fd for 7 TeV pp collisions and measurement of the B0→D-K+ branching fraction

Abstract

The relative abundance of the three decay modes B0→D-K +, B0→D-π+, and Bs0→Ds- π+ produced in 7 TeV pp collisions at the LHC is determined from data corresponding to an integrated luminosity of 35pb-1. The branching fraction of B0→D-K+ is found to be B(B0→D-K+)=(2.01±0.18stat±0.14syst) ×10-4. The ratio of fragmentation fractions f s/fd is determined through the relative abundance of Bs0→Ds-π+ to B0→D-K+ and B0→D-π+, leading to fs/f d=0.253±0.017±0.017±0.020, where the uncertainties are statistical, systematic, and theoretical, respectively. © 2011 CERN.