NONPERTURBATIVE RENORMALIZATION OF QUARK BILINEARS

We compute non-perturbatively the renormalization constants of quark b ilinears on the lattice in the quenched approximation at three values of the coupling beta = 6/g(0)(2) = 6.0, 6.2, 6.4 using both the Wilson and the tree-level improved SW-Clover fermion action. We perform a Re normalization Group analysis at the next-to-next-to-leading order and compute Renormalization Group invariant values for the constants. The results are applied to obtain a fully non-perturbative estimate of the vector and pseudoscalar decay constants. (C) 1998 Elsevier Science B. V.