2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/227323We address the question of how to establish a connection between leptogenesis and low energy observables. We emphasize that such a connection only exists in the framework of flavour models. A particular example is the case of texture zeros in some of the Yukawa couplings.Invited talk presented by Gustavo C. Branco at NOW 2008: Neutrino Oscillation Workshop, 6-13 Sep 2008, Conca Specchiulla (Otranto), Lecce, ItalyHigh Energy Physics - Phenomenologytext