BOUNDS ON F(B) FROM LATTICE QCD

We present a study of finite-a effects in the leptonic decay constant f(P) of heavy pseudoscalar mesons. Exploiting results on three lattices - with inverse lattice spacings a-1 = 3.35, 2.3 and 1.53 GeV - to extrapolate f(P) to a = 0, we can bound the B-meson decay constant f(B), within the quenched approximation, by 188 MeV < f(B) < 246 MeV. This range of f(B) allows for sizeable CP-violation effects in the B-meson decay B(d)(B(d)BAR) --> J/psi K(s).