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Measurement of ${\mathcal B}$($B_s \rightarrow D_s X$) with $B_s$ Semileptonic Tagging
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abstract
We report the first direct measurement of the inclusive branching fraction ${\mathcal B}(B_s \rightarrow D_s X)$ via $B_s$ tagging in $e^+e^-\to\Upsilon$(5S) events. Tagging is accomplished through a partial reconstruction of semileptonic decays $B_s \rightarrow D_s X \ell \nu$, where $X$ denotes unreconstructed additional hadrons or photons and $\ell$ is an electron or muon. With 121.4 fb$^{-1}$ of data collected at the $\Upsilon$(5S) resonance by the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider, we obtain ${\mathcal B}(B_s \rightarrow D_s X)$ = $(60.2 \pm 5.8 \pm 2.3)$\%, where the first uncertainty is statistical and the second is systematic.
Forward citations
Cited by 1 Pith paper
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Measurement of the inclusive branching fractions for $B_s^0$ decays into $D$ mesons via hadronic tagging
Belle's hadronic-tagging analysis at the Upsilon(10860) yields B(Bs->Ds±X)=(68.6±7.2±4.0)%, B(Bs->D0X)=(21.5±6.1±1.8)%, and the first measurement of B(Bs->D±X)=(12.6±4.6±1.3)%.
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