/ Experiment-HEP arXiv:1103.1864

Measurement of the $B_s$ Lifetime in Fully and Partially Reconstructed $B_s \to D_s^- (\phi \pi^-)X$ Decays in $\bar{p}-p$ Collisions at $\sqrt{s} = 1.96$ TeV

Published in: Phys.Rev.Lett.

Abstract: We present a measurement of the Bs lifetime in fully and partially reconstructed Bs -> Ds(phi pi)X decays in 1.3 fb-1 of pbar-p collisions at sqrt(s) = 1.96 TeV collected by the CDF II detector at the Fermilab Tevatron. We measure tau(Bs) = 1.518 +/- 0.041 (stat.) +/- 0.027 (syst.) ps. The ratio of this result and the world average B0 lifetime yields tau(Bs)/tau(B0) = 0.99 +/-0.03, which is in agreement with recent theoretical predictions.

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