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 1.0 fb−1 of pp collision data collected at a centre-of-mass energy of 7 TeV 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 ± 0.007 ps, τB0→K+π− = 1.524 ± 0.011 ± 0.004 ps, τB0s→π+K− = 1.60 ± 0.06 ± 0.01 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 B0s mixing phase and the width difference ΔΓs.