Effective lifetime measurements in the Bs0 → K+ K-, B0 → K+ π- and Bs0→π+ K- decays

Measurements of the effective lifetimes in the B<inf>s</inf>⁰→K⁺K^-,^B0→^{K +π-} and Bs0→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 areτBs0→K+K-=1.407±0.016(stat)±0.007(syst) ps,τB0→K+π-=1.524±0.011(stat)±0.004(syst) ps,τBs0→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 Bs0→K+K- decay and provides constraints on contributions from physics beyond the Standard Model to the Bs0 mixing phase and the width difference δ<inf>Γs</inf>. © 2014 The Authors.