Tesis de Postgrado Acceso Interno
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Browsing Tesis de Postgrado Acceso Interno by Subject "331"
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Thesis FERMION MASSES AND MIXINGS AND SOME PHENOMENOLOGICAL ASPECTS OF A 331 MODEL WITH LINEAL SEESAW MECHANISM(2019-12-13) Pérez Julve, Nicolás Andrés; Universidad Técnica Federico Santa María. Departamento de FísicaA 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.Thesis PHENOMENOLOGICAL ASPECTS OF A MODEL WITH EXTENDED GAUGE SIMMETRY, T' DISCRETE SYMMETRY AND LOW SCALE SEESAW MECHANISMS(2020-01) Hidalgo Velásquez, Yocelyne; Universidad Técnica Federico Santa María. Departamento de FísicaWe construct a viable 3-3-1 model with two SU (3)L scalar triplets, extended fermion and scalar spectrum, based on the T 0 family symmetry and other auxiliary cyclic symmetries, whose spontaneous breaking yields the observed pattern of SM fermion mass spectrum and fermionic mixing parameters. In our model the SM quarks lighter than the top quark, get their masses from a low scale Universal seesaw mechanism, the SM charged lepton masses are produced by a Froggatt- Nielsen mechanism and the small light active neutrino masses are generated from an inverse seesaw mechanism. The model is consistent with the low energy SM fermion flavor data and successfully accommodates the current Higgs diphoton decay rate and predicts charged lepton flavor violating decays within the reach of the forthcoming experiments.
