Weak decays of pseudo Goldstone bosons

Abstract

A short overview of recent progress in describing kaon and pion decays within Chiral Perturbation Theory is presented. Particular attention is devoted to the issues of final-state interactions and isospin breaking in $K\to 2\pi$, as well as to the estimate of long-distance contributions in $K\to {\ell }^{+}{\ell }^{-}(\pi )$.

Comments: 13 pages, invited talk at Chiral Dynamics 2000, Newport News, USA, 17-22 July 2000