Measurement of the Semileptonic Charge Asymmetry using Bs0→D sμX Decays

Abstract

We present a measurement of the time-integrated flavor-specific semileptonic charge asymmetry in the decays of Bs0 mesons that have undergone flavor mixing, asls, using Bs0(B̄s0) →Dsâ̂μ±X decays, with Dsâ̂→ πâ̂ and →K+K-, using 10.4 fb-1 of proton-antiproton collisions collected by the D0 detector during Run II at the Fermilab Tevatron Collider. A fit to the difference between the time-integrated Ds- and Ds+ mass distributions of the Bs0 and B̄s0 candidates yields the flavor-specific asymmetry asls=[-1.12±0.74(stat) ±0.17(syst)]%, which is the most precise measurement and in agreement with the standard model prediction. © 2013 American Physical Society.