Measurement of the Semileptonic Charge Asymmetry using Bs0→DsμX Decays

Le résumé fourni par la source

We present a measurement of the time-integrated flavor-specific semileptonic charge asymmetry in the decays of ${B}_{s}^{0}$ mesons that have undergone flavor mixing, ${a}_{\mathrm{sl}}^{s}$, using ${B}_{s}^{0}({\overline{B}}_{s}^{0})\ensuremath{\rightarrow}{D}_{s}^{\ensuremath{\mp}}{\ensuremath{\mu}}^{\ifmmode\pm\else\textpm\fi{}}X$ decays, with ${D}_{s}^{\ensuremath{\mp}}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{\ensuremath{\mp}}$ and $\ensuremath{\phi}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$, using $10.4\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ 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 ${D}_{s}^{\ensuremath{-}}$ and ${D}_{s}^{+}$ mass distributions of the ${B}_{s}^{0}$ and ${\overline{B}}_{s}^{0}$ candidates yields the flavor-specific asymmetry ${a}_{\mathrm{sl}}^{s}=[\ensuremath{-}1.12\ifmmode\pm\else\textpm\fi{}0.74(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.17(\mathrm{syst})]%$, which is the most precise measurement and in agreement with the standard model prediction.

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