Abstract
We compute several matrix elements of dimension-six four-fermion operators and extract their B-parameters. The calculations have been performed with the tree-level Clover action at β=6.0. The renormalization constants and mixing coefficients of the lattice operators have been obtained non-perturbatively. In the MS renormalization scheme, at a renormalization scale μ≃2 GeV, we find BK(B93/2)=0.66(11),B73/2=0.72(5) and B83/2=1.03(3). The result for B83/2 has important implications for the calculation of ϵ′/ϵ.
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