2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/37837Some Kaons and Hyperons rare decays branching ratios and form factors were measured by the NA48 experiment at CERN. The details of the measurements and their importance for the understanding of the CKM quark mixing matrix are discussed.Talk given at the HEP-MAD04 conference held in Antananarivo(Madagascar) from Septembere 27th to October 3rd, 2004High Energy Physics - Experimenttext