Non - Factorizable Phases , Yukawa Textures and the Size of sin 2 β

We emphasize the crucial rôle played by non-factorizable phases in the analysis of the Yukawa flavour structure performed in weak bases with Her-mitian mass matrices and with vanishing (1, 1) entries. We show that non-factorizable phases are important in order to generate a sufficiently large sin 2β. A method is suggested to reconstruct the flavour structure of Yukawa couplings from input experimental data both in this Hermitian basis and in a non-Hermitian basis with a maximal number of texture zeros. The corresponding Froggatt–Nielsen patterns are presented in both cases.