HEAVY-LIGHT DECAY CONSTANTS - MILC RESULTS WITH THE WILSON ACTION

We present the current status of our ongoing calculations of pseudosca lar meson decay constants for mesons that contain one light and one he avy quark (f(B), f(Bs), f(D), f(Ds)). We are currently generating new gauge configurations that include dynamical quarks and calculating the decay constants. In addition, we have several new results for the sta tic approximation. Those results, as well as several refinements to th e analysis, are new since Lattice '96. Our current (still preliminary) value for f(B) is 156 +/- 11 +/- 30 +/- 14 MeV, where the first error is from statistical and fitting errors, the second error is an estima te of other systematic errors within the quenched approximation and th e third error is an estimate of the quenching error. For the ratio f(B s)/f(B), We get 1.11 +/- 0.02 +/- 0.03 +/- 0.07.