Phenomenology of supersymmetric models with anomalous symmetries $U(1)_{H}$

Abstract

We adopt in this thesis a new approach by assuming a set of $H$-charges that give rise to a self-consistent model of $R$-parity breaking and baryon-number violation. As a consequence of our $H$-charge assignments, it is not possible to generate a Majorana mass term for left-handed neutrinos. However, a neutrino Dirac matrix can be built after the introduction of right-handed neutrinos with proper $H$-charges. We also show that by adding a second flavon field with fractional charge, it is possible to build a Majorana neutrino mass matrix. In both cases an anarchical matrix. The consequences for collider physics are mentioned. We will generalize the mechanism of obtain $R$--parity from an horizontal symmetry to the context of $SU(5)$ SUSY $+ \widehat{N}$, and computable group theoretical coefficients that, at leading order, determine the structure of the neutrino mass matrix in a parameter independent way.