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FB at the 1/m order of HQET

Presenter: Nicolas Garron — DESY

Benoît Blossier, Michele Della Morte, Nicolas Garron, Rainer Sommer

We present a method to compute 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.