Non-perturbative renormalization of the complete basis of four-fermion operators and B-parameters

Abstract We present results on the B-parameters B K , B 7 3 2 and B 8 3 2 , at β = 6.0, with the tree-level Clover action. The renormalization of the complete basis of dimension-six four-fermion operators has been performed non-perturbatively. Our results for BK and B 7 3 2 are in reasonable agreement with those obtained with the (unimproved) Wilson action. This is not the case for B 8 3 2 . We also discuss some subtleties arising from a recently proposed modified definition of the B-parameters.