K0-K0bar on the Lattice

TL;DR

This paper reviews recent lattice QCD calculations of the BK parameter and four-fermion operator matrix elements, crucial for understanding CP violation and new physics beyond the Standard Model.

Contribution

It provides updated lattice results for the BK parameter and extends calculations to all relevant operators for beyond Standard Model theories.

Findings

Precise BK parameter values from Nf=2 and Nf=2+1 simulations.

Initial results for full basis of Delta_S=2 operators beyond Standard Model.

Enhanced understanding of flavor-changing processes in lattice QCD.

Abstract

I review recent lattice calculations performed with Nf=2 and Nf=2+1 dynamical fermions which provide a precise computation of the BK bag parameter. I also report on Nf=2 dynamical quark simulations aiming at the computation of the full basis of the Delta_S=2 four-fermion operator matrix elements that are relevant to models beyond the Standard Model.