Sala Seminarios IFIC (Edf. Institutos de Investigación)
Sala Seminarios IFIC
Edf. Institutos de Investigación
Descripción
In recent years, our knowledge of the flavor structure in the leptonsector greatly improved thanks to neutrino oscillation experiments.The pattern of fermion masses and mixing angles gives importantindications about what is the physics beyond the Standard Model.We investigate two complementary approaches to this Flavor Problem.First, we consider discrete groups as family symmetries, in particular as a tool to generate a maximal 2-3 mixing or a zero 1-3 mixing.Recently proposed models are discussed, based on the permutation group $S_3$, the quaternion group $Q_8$, or the rectangle group $Z_2 \times Z_2$, with definite predictions for quark and lepton masses and mixing. The phenomenology of the associated electroweak Higgs sector is presented.Second, we consider some recent analyses of the Flavor Sector in SUSY SO(10) Grand Unification Theories. The merits and limits of the "minimal SUSY GUT" model are discussed: maximal mixing is related with $b-\tau$ unification, but the global fit of all masses and mixing is problematic. We suggest a minimal extensionof the GUT Higgs sector which improves the fit in a predictive way.