FERMION MASSES AND MIXINGS AND SOME PHENOMENOLOGICAL ASPECTS OF A 331 MODEL WITH LINEAL SEESAW MECHANISM

Abstract

A viable theory based on the SU (3)C × SU (3)L × U (1)X gauge group supplemented by the S4 discrete group together with other various symmetries is proposed. The spontaneous breaking of such discrete symmetries gives rise to the current SM fermion mass and mixing hierarchy. In the proposed theory the small light active neutrino masses are generated from a linear seesaw mechanism mediated by three Majorana neutrinos. The model is capable of reproducing the experimental values of the physical observables of both quark and lepton sectors. The model is predictive in the quark sector having 9 effective parameters that allow to successfully reproduce the four CKM parameters and the six Standard Model (SM) quark masses. In the SM quark sector, there is particular scenario, motivated by naturalness arguments, which allows a good fit for its ten observables, with only six effective parameters. It is has been studied the single heavy scalar production via gluon fusion mechanism at proton-proton collider. The model is also consistent with the experimental constraints arising from the Higgs diphoton decay rate.