K0-K0bar Mixing with Wilson Fermions without Subtractions

Abstract

By using suitable Ward identities, we show that it is possible to compute K0-K0bar mixing without subtracting the terms generated by explicit chiral symmetry breaking present in Wilson-like lattice actions. The accuracy in the determination of the amplitudes is of O(a), which is the best one attainable in the absence of improvement.

Comments: 10 pages, latex, 2 figures, typo in eq.(17) corrected