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

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 ${\epsilon }^{\prime }/\epsilon$, are given in the chiral limit.

Talk presented at EPS HEP99, Tampere, Finland, July 15-21,1999; uses hep99.cls and hep990.clo