2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43816The general framework and the present status of the low energy theory of the standard model are briefly reviewed. Recent applications to a few topic of interest for the determinations of Vud and of Vus are discussedTalk given at the DAPHNE 2004 Workshop, Frascati, June 7 - 11, 2004; 9 pages, uses frascatiphys.styHigh Energy Physics - PhenomenologyHigh Energy Physics - ExperimentHigh Energy Physics - Latticetext