Measurement of the inclusive semileptonic branching fraction $\mathcal{B}(B_s^0\to X^{-}{\ell }^{+}{\nu }_{\ell })$ at Belle

Abstract

We report a measurement of the inclusive semileptonic $B_s^0$ branching fraction in a $121f{b}^{-1}$ data sample collected near the ${\rm Y}(5S)$ resonance with the Belle detector at the KEKB asymmetric energy $e^{+}{e}^{-}$ collider. Events containing $B_s^0$ pairs are selected by reconstructing a tag side $D_s^{+}$ and identifying a signal side lepton ${\ell }^{+}$ ($\ell =e,\mu$) that is required to have the same-sign charge to ensure that both originate from different $B_s^0$ mesons. The $B_s^0\to X^{-}{\ell }^{+}{\nu }_{\ell }$ branching fraction is extracted from the ratio of the measured yields of $D_s^{+}$ mesons and $D_s^{+}{\ell }^{+}$ pairs and the known production and branching fractions. The inclusive semileptonic branching fraction is measured to be $[9.6\pm 0.4\text{(stat)}\pm 0.7\text{(syst)}]\%$.

Updated results after correction of an error concerning semileptonic B_s decays in the Belle EvtGen installation. Details can be found in the attached Erratum

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• $B_s\to D_s(3040)$ form factors and $B_s$ decays into $D_s(3040)$
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Cited by in corpus (7)

• Semileptonic and leptonic $B$ decays, circa 2016
• Strong $D_s^{\ast }{D}_s{\eta }^{(\prime )}$ and $B_s^{\ast }{B}_s{\eta }^{(\prime )}$ vertices from QCD light-cone sum rules
• Semi-inclusive studies of semileptonic $B_s$ decays at Belle
• Progress on semi-leptonic $B_{(s)}$ decays
• Results in $B_s$ physics and bottomonium spectroscopy using the Belle ${\rm Y}(5S)$ data
• Selected Topics in Heavy Flavour Physics
• Semileptonic $B_s$ decays at Belle, Babar, and D0