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 $ΔΓ_s$ and the CP-violating phase $ϕ_s$ of $B^0_s-\bar{B}^0_s$ mixing box-diagram. Measurements of the effective lifetime in the decay channels $B_s^0 \rightarrow K^+ K^-$ and $\bar{B}_s^0 \rightarrow J/ψf_0(980)$ are presented, as well as a measurement of $ΔΓ_s$ and $Γ_s$ performed by a tagged time-dependent angular analysis of $B_s^0 \rightarrow J/ψϕ$ decays and a measurement of the sign of $ΔΓ_s$, using data collected during 2011 with the LHCb detector.

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