Measurements of B lifetimes at LHCb

Abstract

Measurements of the $B_s^0$ effective lifetime in decays to CP-odd and CP-even flavour specific final states allow to probe the width difference $\Delta {\Gamma }_s$ and the CP-violating phase ${\varphi }_s$ of $B_s^0-{\bar{B}}_s^0$ mixing box-diagram. Measurements of the effective lifetime in the decay channels $B_s^0\to K^{+}{K}^{-}$ and ${\bar{B}}_s^0\to J/\psi f_0(980)$ are presented, as well as a measurement of $\Delta {\Gamma }_s$ and ${\Gamma }_s$ performed by a tagged time-dependent angular analysis of $B_s^0\to J/\psi \varphi$ decays and a measurement of the sign of $\Delta {\Gamma }_s$, using data collected during 2011 with the LHCb detector.

arXiv commentProceedings of CKM 2012, the 7th International Workshop on the CKM Unitarity Triangle, University of Cincinnati, USA, 28 September - 2 October 2012

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