Measurement of τ L using the B 0 s → J/ψη decay mode

Using a proton-proton collision data sample collected by the LHCb detector and corresponding to an integrated luminosity of 5.7 fb -1 , the lifetime of the light B 0 s mass eigenstate, τ L , is measured using the B 0 s → J/ψη decay mode to be τL = 1.445 ± 0.016(stat) ± 0.008(syst) ps. A combination of this result with a previous LHCb analysis using an independent dataset corresponding to 3 fb -1 of integrated luminosity gives τL = 1.452 ± 0.014 ± 0.007 ± 0.002 ps, where the first uncertainty is statistical, the second due to the uncorrelated part of the systematic uncertainty and the third due to the correlated part of the systematic uncertainty.