Search for CP violation in Bs0→μ+Ds-X decays in pp̄ collisions at √s=1.96TeV

We have performed a search for CP violation in a sample of Bs0→μ+Ds-X decays corresponding to 5fb-1 of proton-antiproton collisions collected by the D0 detector in Run II at the Fermilab Tevatron Collider. New physics in Bs0 mixing could contribute a significant CP violating weak phase, which would be observed as a difference in the decay-time distribution for Bs0→B̄s0 oscillated states versus that for B̄s0→Bs0. A fit to the decay-time distributions of the Bs0/B̄s0 candidates yields the flavor-specific asymmetry afss=[-1.7±9.1(stat)-1.5+1.4(syst)]×10-3, which excludes CP violation due to new physics within the experimental sensitivity. © 2010 The American Physical Society.