Measurement of the $B_{s}^{0}$ Lifetime in Fully and Partially Reconstructed $B_{s}^{0} \to D_{s}^{-} (ϕ π^{-}) X$ Decays in $\bar{p} p$ Collisions at $\sqrt{s} = 1.96 TeV$

Authors:

Open Access

We present a measurement of the

B_{s}^{0}

lifetime in fully and partially reconstructed

B_{s}^{0} \to D_{s}^{-} (ϕ π^{-}) X

decays in

1.3 {fb}^{- 1}

collected in

p \bar{p}

collisions at

\sqrt{s} = 1.96 TeV

by the CDF II detector at the Fermilab Tevatron. We measure

τ (B_{s}^{0}) = 1.518 \pm 0.041 (stat) \pm 0.027 (syst) ps

. The ratio of this result and the world average

B^{0}

lifetime yields

τ (B_{s}^{0}) / τ (B^{0}) = 0.99 \pm 0.03

, which is in agreement with recent theoretical predictions.

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Measurement of the Bs0 Lifetime in Fully and Partially Reconstructed Bs0→Ds−(ϕπ−)X Decays in p¯p Collisions at s=1.96 TeV