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Measurement of $${mathcal B}$$($$B_s rightarrow D_s X$$) with $$B_s$$ Semileptonic Tagging

Wang, B.*; 谷田 聖   ; Belle Collaboration*; 他157名*

Wang, B.*; Tanida, Kiyoshi; Belle Collaboration*; 157 of others*

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.

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パーセンタイル:14.79

分野:Astronomy & Astrophysics

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