Towards a lattice determination of the B*B pi coupling

The coupling g(B* B pi) is related to the form factor at zero momentum of t he axial current between B*- and B-states. This form factor is evaluated on the lattice using static heavy quarks and light quark propagators determin ed by a stochastic inversion of the fermionic bilinear. The g(B* B pi) coup ling is related to the coupling g between heavy mesons and low-momentum pio ns in the effective heavy meson chiral lagrangian. The coupling of the effe ctive theory can therefore be computed by numerical simulations. We find th e value g = 0.42(4)(8). Besides its theoretical interest, the phenomenologi cal implications of such a determination are discussed.