Measurement of the Bs Meson Lifetime

Le résumé fourni par la source

The lifetime of the ${B}_{s}$ meson is measured using the semileptonic decay ${B}_{s}\ensuremath{\rightarrow}{D}_{s}^{\ensuremath{-}}{\ensuremath{\ell}}^{+}\ensuremath{\nu}X$. The data sample consists of 19.3 ${\mathrm{pb}}^{\ensuremath{-}1}$ of $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8$ TeV collected by the Collider Detector at Fermilab during 1992--1993. There are $76\ifmmode\pm\else\textpm\fi{}8$ ${\ensuremath{\ell}}^{+}{D}_{s}^{\ensuremath{-}}$ signal events where the ${D}_{s}$ is identified via the decay ${D}_{s}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\varphi}{\ensuremath{\pi}}^{\ensuremath{-}}$, $\ensuremath{\varphi}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$. Using these events, the ${B}_{s}$ meson lifetime is determined to be ${\ensuremath{\tau}}_{s}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.42}_{\ensuremath{-}0.23}^{+0.27}(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.11(\mathrm{syst})$ ps. A measurement of the ${B}_{s}$ lifetime in a low statistics sample of exclusive ${B}_{s}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\varphi}$ decays is also presented in this paper.

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