2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44383Rare K decays provide for very clean tests of the Standard Model, and are especially suited to search for New Physics signal. In this talk, recent progresses in the estimation of long-distance effects induced by light quarks in KL to pi0 mu+ mu- and K+ to pi+ nu nu are reported.Talk given at the XLth Rencontres de Moriond, Electroweak Interactions and Unified Theories, La Thuile, Italy, 5-12 March 2005High Energy Physics - Phenomenologytext