arXiv:1210.7932·v1·High Energy Physics — Lattice
B-physics from HQET in two-flavour lattice QCD
F. Bernardoni🇩🇪 · B. Blossier🇫🇷 · J. Bulava🇨🇭 · M. Della Morte🇩🇪 · P. Fritzsch🇩🇪 · N. Garron🇮🇪 · A. Gérardin🇫🇷 · J. Heitger🇩🇪 · G. von Hippel🇩🇪 · H. Simma🇩🇪 · R. Sommer🇩🇪
Abstract
We present our analysis of B physics quantities using non-perturbatively matched Heavy Quark Effective Theory (HQET) in Nf= 2 lattice QCD on the CLS ensembles. Using all-to-all propagators, HYP-smeared static quarks, and the Generalized Eigenvalue Problem (GEVP) approach with a conservative plateau selection procedure, we are able to systematically control all sources of error. With significantly increased statistics compared to last year, our preliminary results are mb (mb) = 4.22(10)(4)z GeV for the MS b-quark mass, and fB = 193(9)stat (4)_\chi MeV and fBs = 219(12)stat MeV for the B-meson decay constants.