Non-factorizable phases, Yukawa textures and the size of sin2β

We emphasize the crucial role played by non-factorizable phases in the analysis of the Yukawa flavour structure performed in weak bases with Hermitian mass matrices and with vanishing (1,1) entries. We show that non-factorizable phases are important in order to generate a sufficiently large sin2β. 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