Numerical updates of lifetimes and mixing parameters of B mesons

We update the Standard-Model predictions for several quantities related to Bs−Bs and Bd−Bd mixing. The mass and width differences in the Bs system read ∆M SM s = (17.3 ± 2.6) ps and ∆Γ s = (0.087 ± 0.021) ps, respectively. The CP asymmetries in flavour-specific decays are a fs = (1.9±0.3)·10−5 and a d,SM fs = −(4.1±0.6)·10−4. We further critically discuss the sensitivity of ∆Γd to new physics and the uncertainties in the relation between ∆Γs and the branching fraction of ( ) Bs → D s +D s . Then we present a numerical update of the average width Γs in the Bs system and correlate Γs with the B –Bd lifetime ratio. Finally we summarise the key results of our recent global analysis with the CKMfitter collaboration addressing new physics in B−B mixing. In an appropriately defined scenario parametrising new physics in B−B mixing by two complex parameters ∆d and ∆s the Standard-Model point ∆d = ∆s = 1 is disfavoured by 3.6 standard deviations.