LATTICE B-PARAMETERS FOR DELTA-S=2 AND DELTA-I=3 2 OPERATORS/

We compute several matrix elements of dimension-six four-fermion opera tors and extract their B-parameters. The calculations have been perfor med with the tree-level Clover action at beta = 6.0. The renormalizati on constants and mixing coefficients of the lattice operators have bee n obtained non-perturbatively. In the <(MS)over bar> renormalization s cheme, at a renormalization scale mu similar or equal to 2 GeV, we fin d B-K(B-9(3/2))=0.66(11), B-7(3/2)=0.72(5) and B-8(3/2)=1.03(3). The r esult for B-8(3/2) has important implications for the calculation of e psilon'/epsilon. (C) 1998 Elsevier Science B.V.