Beauty hadron lifetimes and B-meson CP-violation parameters from lattice QCD

The present status of the theoretical estimates of beauty hadron lifetime ratios and of width differences and CP-violation parameters in Bd and Bs systems is reviewed. In the last two years accurate lattice calculations and next-to-leading order perturbative computations have improved these theoretical predictions, leading to the following updated results: τ(B+)/τ(Bd)= 1.06 ± 0.02, τ(Bs)/τ(Bd)= 1.00 ± 0.01, τ(Λb)/τ(Bd)= 0.88 ± 0.05, ΔΓd/Γd = (2.42 ± 0.59)10–3, ΔΓs/Γs = (7.4 ± 2.4)10–2, ∣(q/p)d∣–1=(2.96 ± 0.67) 10–4 and ∣(q/p)s∣–1=–(1.28 ± 0.28) 10–5.