Following the strategy developed by the ALPHA collaboration, we present a method to compute non-perturbatively the decay constant of a heavy-light meson in HQET including the 1/m corrections. We start by a matching between HQET and QCD in a small volume to determine the parameters of the effective theory non-perturbatively. Observables in the effective theory are then evolved to larger volumes. In two steps a large enough volume is reached to determine the physical decay constant. Some preliminary results in the quenched approximation are shown.
@article{arxiv.0710.1553,
title = {Heavy-light decay constant at the 1/m order of HQET},
author = {Benoît Blossier and Michele Della Morte and Nicolas Garron and Rainer Sommer},
journal= {arXiv preprint arXiv:0710.1553},
year = {2009}
}
Comments
7 pages, contribution to the XXV International Symposium on Lattice Field Theory, parallel session "Standard model parameters and renormalization"