Weak Matrix Elements of beyond the Standard Model Δs = 2 four-quark operators from nf = 2+1 Domain-Wall fermions

Abstract

We report on our computation of the hadronic matrix elements of the four-quark operators needed for the study of K0 K0 mixing beyond the Standard Model (SM). We consider nf = 2+1 Domain-Wall fermions on Iwasaki gauge action with lightest unitary pion of 290MeV and a single lattice spacing a 0:086fm. The renormalization is performed non-perturbatively through the RI-MOM scheme and our results are converted perturbatively to MS. We have estimated the various systematic errors. Our results confirm a previous quenched study, where large ratios of non-SM to SM matrix elements were obtained.