Search for CP violation in semileptonic Bs decays

Abstract

We have performed a search for CP violation in a sample of semileptonic Bs decays corresponding to approximately 5 inverse femtobarns of data collected by the D0 detector in Run II at the Fermilab Tevatron Collider. A time-dependent fit to the distributions of the Bs candidates yields the flavor-specific asymmetry $a_{fs}^{s}=[-1.7pm 9.1mathrm{(stat)}^{_s161.2}_{-2.3}mathrm{(syst)}]times 10^{-3}$. This is the most precise measurement to date of this CP violation parameter.