2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/42341Most of the analytic approaches which are used at present to understand Kaon decays, get their inspiration from QCD in the limit of a large number of colours $N_c$. After a general overview, we illustrate this with a recent application to the evaluation of the process $K_L\raμ^+ μ^-$ in the Standard Model.Invited talk at the Blois Conference, June 2002High Energy Physics - Phenomenologytext