Measurement of B(Bs→DsX) with Bs semileptonic tagging

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Abstract

We report the first direct measurement of the inclusive branching fraction $\mathcal{B}({B}_{s}\ensuremath{\rightarrow}{D}_{s}X)$ via ${B}_{s}$ tagging in ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\mathrm{\ensuremath{\Upsilon}}(5\mathrm{S})$ events. Tagging is accomplished through a partial reconstruction of semileptonic decays ${B}_{s}\ensuremath{\rightarrow}{D}_{s}X\ensuremath{\ell}\ensuremath{\nu}$, where $X$ denotes unreconstructed additional hadrons or photons and $\ensuremath{\ell}$ is an electron or muon. With $121.4\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected at the $\mathrm{\ensuremath{\Upsilon}}(5\mathrm{S})$ resonance by the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider, we obtain $\mathcal{B}({B}_{s}\ensuremath{\rightarrow}{D}_{s}X)=(60.2\ifmmode\pm\else\textpm\fi{}5.8\ifmmode\pm\else\textpm\fi{}2.3)%$, where the first uncertainty is statistical and the second is systematic.

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