Measurement of the Bs Meson Lifetime

Abstract

The lifetime of the $B_s$ meson is measured using the semileptonic decay $B_s\to D_s^{-}{\ell }^{+}\nu X$. The data sample consists of 19.3 pb${}^{-1}$ of $p\bar{p}$ collisions at $\sqrt{s}=1.8$ TeV collected by the CDF detector at the Fermilab Tevatron collider during 1992-1993. There are $76\pm 8$ ${\ell }^{+}{D}_s^{-}$ signal events where the $D_s$ is identified via the decay $D_s^{-}\to \varphi {\pi }^{-}$,~$\varphi \to K^{+}{K}^{-}$. Using these events, the $B_s$ meson lifetime is determined to be ${\tau }_s=1.42_{-0.23}^{+0.27}(\mathrm{stat})\pm 0.11(\mathrm{syst})$ ps. A measurement of the $B_s$ lifetime in a low statistics sample of exclusive $B_s\to J/\psi \varphi$ decays is also presented in this paper.

18 pages, 3 figures (2 .ps 1 .eps)

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