Beauty Hadron Lifetimes and B-Meson CP-Violation Parameters from Lattice QCD

Abstract

The present status of the theoretical estimates of beauty hadron lifetime ratios and of width differences and CP-violation parameters in $B_d$ and $B_s$ 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(B_d)=1.06 +- 0.02, τ(B_s)/τ(B_d)=1.00 +- 0.01, τ(Λ_b)/τ(B_d)=0.88 +- 0.05, ΔΓ_{d}/Γ_{d} = (2.42 +- 0.59)10^{-3}, ΔΓ_{s}/Γ_{s} = (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}