Decay constants of B-mesons from non-perturbative HQET with two light dynamical quarks - Archive ouverte HAL Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2014

Decay constants of B-mesons from non-perturbative HQET with two light dynamical quarks

Résumé

We present a computation of B-meson decay constants from lattice QCD simulations within the framework of Heavy Quark Effective Theory for the b-quark. The next-to-leading order corrections in the HQET expansion are included non-perturbatively. Based on Nf=2 gauge field ensembles, covering three lattice spacings a (0.08-0.05)fm and pion masses down to 190MeV, a variational method for extracting hadronic matrix elements is used to keep systematic errors under control. In addition we perform a careful autocorrelation analysis in the extrapolation to the continuum and to the physical pion mass limits. Our final results read fB=186(13)MeV, fBs=224(14)MeV and fBs/fB=1.203(65). A comparison with other results in the literature does not reveal a dependence on the number of dynamical quarks, and effects from truncating HQET appear to be negligible.

Dates et versions

hal-00982284 , version 1 (23-04-2014)

Identifiants

Citer

F. Bernardoni, B. Blossier, J. Bulava, M. Della Morte, P. Fritzsch, et al.. Decay constants of B-mesons from non-perturbative HQET with two light dynamical quarks. 2014. ⟨hal-00982284⟩
144 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More