Effective lifetime measurements in the B0s→K+K−, B0→K+π−and B0s→π+K−decays

Abstract

Measurements of the effective lifetimes in the B0s→K+K−, B0→K+π−and B0s→π+K−decays are presented using 1.0fb−1of ppcollision data collected at a centre-of-mass energy of 7TeV by the LHCb experiment. The analysis uses a data-driven approach to correct for the decay time acceptance. The measured effective lifetimes are τB0s→K+K−=1.407±0.016(stat)±0.007(syst)ps, τB0→K+π−=1.524±0.011(stat)±0.004(syst)ps, τB0s→π+K−=1.60±0.06(stat)±0.01(syst)ps. This is the most precise determination to date of the effective lifetime in the B0s→K+K−decay and provides constraints on contributions from physics beyond the Standard Model to the B0smixing phase and the width difference Γs.