STATUS-REPORT ON WEAK MATRIX ELEMENT CALCULATIONS

This talk presents results of weak matrix elements calculated from sim ulations done on 170 32(3) x 64 lattices at beta = 6.0 using quenched Wilson fermions. We discuss the extraction of pseudoscalar decay const ants f(pi), f(K), f(D), and f(Ds), the form-factors for the rare decay B --> Kgamma, and the matrix elements of the Li-fermion operators re levant to B-K, B-7, B-8. We present an analysis of the various sources of systematic errors, and show that these are now much larger than th e statistical errors for each of these observables. Our main results a re f(D) = 186(29) MeV, f(Ds) = 224(16)MeV, T-1 = T-2 = 0.24(1), B-K(ND R, 2 GeV) = 0.67(9), and B-8(NDR, 2 GeV) = 0.81(1).