%0 Journal Article
%T Decay constants of B-mesons from non-perturbative HQET with two light dynamical quarks
%A Bernardoni, F.
%A Blossier, B.
%A Bulava, J.
%A Della Morte, M.
%A Fritzsch, P.
%A Garron, N.
%A Gerardin, A.
%A Heitger, J.
%A von Hippel, G.
%A Simma, H.
%A Sommer, R.
%J Physics Letters B
%D 2014
%V 735
%I Elsevier Science Bv
%@ 0370-2693
%G English
%F Bernardoni_etal2014
%O WOS:000340048900061
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=1881), last updated on Tue, 02 Sep 2014 19:38:14 +0000
%X 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 N-f = 2 gauge field ensembles, covering three lattice spacings a approximate to (0.08-0.05) fm and pion masses down to 190 MeV, 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 f(B) = 186(13) MeV, f(Bs) = 224(14) MeV and f(Bs)/f(B) = 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.
%K Lattice QCD
%K Heavy Quark Effective Theory
%K Bottom quarks
%K Meson decay
%R 10.1016/j.physletb.2014.06.051
%U http://arxiv.org/abs/arXiv:1404.3590
%U https://doi.org/10.1016/j.physletb.2014.06.051
%P 349-356