The $\Delta I=1/2$ rule and other matrix elements

TL;DR

This paper discusses a method to connect long and short-distance effects in kaon decays, providing numerical results for the $=1/2$ rule and related matrix elements relevant for CP violation.

Contribution

It introduces a consistent approach to link long and short-distance physics in kaon decay calculations, with numerical results in the chiral limit.

Findings

Numerical results for the $=1/2$ rule

Results for $B_6$ parameter relevant to $'/$

Method for connecting long and short-distance effects

Abstract

Recent work by J.Prades and myself on $K\to\pi\pi$ is described. The method we use to consistently connect long and short distances is described and numerical results for the $\Delta I=1/2$ rule and on $B_6$, the parameter relevant for the strong part of $\epsilon'/\epsilon$, are given in the chiral limit.