2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49472Recent work by J.Prades and myself on $K\toππ$ is described. The method we use to consistently connect long and short distances is described and numerical results for the $ΔI=1/2$ rule and on $B_6$, the parameter relevant for the strong part of $ε'/ε$, are given in the chiral limit.Talk presented at EPS HEP99, Tampere, Finland, July 15-21,1999; uses hep99.cls and hep990.cloHigh Energy Physics - Phenomenologytext