2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44360In this talk we discuss the implications of the Minimal Supersymmetric Standard Model augmented by a single U(1) anomalous family symmetry for neutrino masses and mixing angles. The left-handed neutrino states are provided with Majorana masses through a dimension-five operator in the absence of right handed neutrino components. Assuming symmetric lepton mass matrices, the model predicts inverse hierarchical neutrino mass spectrum, theta_13=0 and large mixing while at the same time it provides acceptable mass matrices for the charged fermions.Based on a talk given in the "Workshop on Recent Advances in Particle Physics and Cosmology", Thessaloniki 2005High Energy Physics - Phenomenologytext