Speaker
Benoit Blossier
(DESY Zeuthen)
Description
We will present a strategy to extract from a lattice computation the decay constant f_Bs. It involves a non pertubative matching of QCD with Heavy Quark Effective Theory including 1/m_b corrections, which is done in a very small physical volume. After a non perturbative evolution of observables in the effective theory to larger volumes, the decay constant is determined from simulations performed in a big lattice. All the steps are done by keeping the continuum limit extrapolation under control. Preliminary results of a quenched calculation are shown.
