Measurement of the $B_s^0$ Lifetime Using Semileptonic Decays

Abstract

We report a measurement of the $B_s^0$ lifetime in the semileptonic decay channel $B_s^0\to D_s^{-}{\mu }^{+}\nu X$ (and its charge conjugate), using approximately 0.4 fb${}^{-1}$ of data collected with the D0 detector during 2002 -- 2004. We have reconstructed 5176 $D_s^{-}{\mu }^{+}$ signal events, where the $D_s^{-}$ is identified via the decay $D_s^{-}\to \varphi {\pi }^{-}$, followed by $\varphi \to K^{+}{K}^{-}$. Using these events, we have measured the $B_s^0$ lifetime to be $\tau (B_s^0)=1.398\pm 0.044$ $(stat{)}_{-0.025}^{+0.028}$ $(syst)ps$. This is the most precise measurement of the $B_s^0$ lifetime to date.

arXiv commentTo appear in Phys. Rev. Lett., 7 pages, 2 figures

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