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High Energy Physics

D0 Collaboration

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From arXiv

Measurement of the $B^{0}_{s}$ Lifetime Using Semileptonic Decays

We report a measurement of the

B^0_{s}

lifetime in the semileptonic decay channel

B^0_{s}\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 \phi\pi^-

, followed by

\phi\to K^+ K^-

. Using these events, we have measured the

B^0_s

lifetime to be

\tau(B^0_{s}) = 1.398 \pm 0.044

({stat}) ^{+0.028}_{-0.025}

({syst}) {ps}

. This is the most precise measurement of the

B_s^0

lifetime to date.

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Updated on December 3, 2006

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