Theoretical progress in describing the B-meson lifetimes

Abstract

The present status of the theoretical estimates of the difference between the widths of the neutral Bs-mesons and of the B-meson lifetime ratios is reviewed. In particular, the lattice results for the matrix elements of the relevant (delta B=2)-operators are updated and the first lattice QCD results for the matrix elements of (delta B=0)-operators are presented. In both cases, the NLO perturbative QCD corrections in the coefficient functions have been included. The theoretically updated results are: (delta Gamma/Gamma)_{Bs} = (7 +/- 4) %, tau(B+)/tau(Bd) = 1.07(3) and tau(Bs)/tau(Bd) = 1.00(2).

14 pages (5 figures), Extended version of the talk given at IEC-HEP Budapest, 2001

References in corpus (1)

• Measurement of the Lifetime Difference of $B_d$ Mesons: Possible and Worthwhile?

Cited by in corpus (5)

• B-parameters of the complete set of matrix elements of (Delta B = 2) operators from the lattice
• Subleading Shape Functions in Inclusive B Decays
• The Theoretical status of $\bar{B}-B$-mixing and lifetimes of heavy hadrons
• On the matrix elements of dB=0 operators in the heavy meson decay widths
• Lifetimes and oscillations of heavy mesons