We perform global fits to the moments of semileptonic B-decay distributions and extract |Vcb|, the heavy quark masses, and the nonperturbative parameters of the heavy quark expansion. We include next-to-next-to-leading-order perturbative corrections and recent determinations of the charm mass and discuss how they improve the precision of the global fit. In particular, using the mc determination of Chetyrkin et al. [ Phys. Rev. D 80 074010 (2009)], we get mkinb=4.541(23) GeV and |Vcb|=(42.42±0.86)×10−3. We also discuss the implications of the new fits for the normalization of rare B decays, the zero-recoil sum rule in B→D∗ℓν, and the inclusive determination of |Vub|.
Inclusive semileptonic fits, heavy quark masses, and V_cb
GAMBINO, Paolo;
2014-01-01
Abstract
We perform global fits to the moments of semileptonic B-decay distributions and extract |Vcb|, the heavy quark masses, and the nonperturbative parameters of the heavy quark expansion. We include next-to-next-to-leading-order perturbative corrections and recent determinations of the charm mass and discuss how they improve the precision of the global fit. In particular, using the mc determination of Chetyrkin et al. [ Phys. Rev. D 80 074010 (2009)], we get mkinb=4.541(23) GeV and |Vcb|=(42.42±0.86)×10−3. We also discuss the implications of the new fits for the normalization of rare B decays, the zero-recoil sum rule in B→D∗ℓν, and the inclusive determination of |Vub|.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.