TY  - JOUR
AU  - Bernardoni, F.
AU  - Blossier, B.
AU  - Bulava, J.
AU  - Della Morte, M.
AU  - Fritzsch, P.
AU  - Garron, N.
AU  - Gerardin, A.
AU  - Heitger, J.
AU  - von Hippel, G.
AU  - Simma, H.
AU  - Sommer, R.
PY  - 2014
DA  - 2014//
TI  - Decay constants of B-mesons from non-perturbative HQET with two light dynamical quarks
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 349
EP  - 356
VL  - 735
PB  - Elsevier Science Bv
KW  - Lattice QCD
KW  - Heavy Quark Effective Theory
KW  - Bottom quarks
KW  - Meson decay
AB  - 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.
SN  - 0370-2693
UR  - http://arxiv.org/abs/arXiv:1404.3590
UR  - https://doi.org/10.1016/j.physletb.2014.06.051
DO  - 10.1016/j.physletb.2014.06.051
LA  - English
N1  - WOS:000340048900061
ID  - Bernardoni_etal2014
ER  -