# Determination of $f_s/f_d$ for 7 TeV pp collisions and a measurement of the branching fraction of the decay $B_d\to D^-K^+$,''

NH Brook, P Naik, JH Rademacker, LHCb Collaboration, Marco Adinolfi, Jaap Velthuis

Research output: Contribution to journalArticle (Academic Journal)peer-review

## Abstract

The relative abundance of the three decay modes Bd→D−K+, Bd→D−π+ and Bs→D−sπ+ 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 Bd→D−K+ is found to be B(Bd→D−K+)=(2.01±0.18stat±0.14syst)×10−4. The ratio of fragmentation fractions \fsfdt is determined through the relative abundance of Bs→D−sπ+ to Bd→D−K+ and Bd→D−π+, leading to fs/fd=0.253±0.017±0.017±0.020, where the uncertainties are statistical, systematic, and theoretical respectively.
Translated title of the contribution Determination of $f_s/f_d$ for 7 TeV pp collisions and a measurement of the branching fraction of the decay $B_d\to D^-K^+$,'' English 211801-211807 7 Physical Review Letters 107 Published - 2011

### Bibliographical note

Other: Accepted for publication by PRL

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