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.
@article{arxiv.1210.7932,
title = {B-physics from HQET in two-flavour lattice QCD},
author = {F. Bernardoni and B. Blossier and J. Bulava and M. Della Morte and P. Fritzsch and N. Garron and A. Gérardin and J. Heitger and G. von Hippel and H. Simma and R. Sommer},
journal= {arXiv preprint arXiv:1210.7932},
year = {2012}
}