Browsing by Author "Cebola, Luis M."
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- Anomaly-free U(1) gauge symmetries in neutrino seesaw flavor modelsPublication . Cebola, Luis M.; Emmanuel-Costa, David; Felipe, Ricardo GonzalezAdding right-handed neutrino singlets and/or fermion triplets to the particle content of the standard model allows for the implementation of the seesaw mechanism to give mass to neutrinos and, simultaneously, for the construction of anomaly-free gauge group extensions of the theory. We consider Abelian extensions based on an extra U(1)(X) gauge symmetry, where X is an arbitrary linear combination of the baryon number B and the individual lepton numbers L-e,L-mu,L-tau. By requiring cancellation of gauge anomalies, we perform a detailed analysis in order to identify the charge assignments under the new gauge symmetry that lead to neutrino phenomenology compatible with current experiments. In particular, we study how the new symmetry can constrain the flavor structure of the Majorana neutrino mass matrix, leading to two-zero textures with a minimal extra fermion and scalar content. The possibility of distinguishing different gauge symmetries and seesaw realizations at colliders is also briefly discussed.
- Neutrino observables from predictive flavour patternsPublication . Cebola, Luis M.; Emmanuel-Costa, David; Felipe, Ricardo GonzalezWe look for predictive flavour patterns of the effective Majorana neutrino mass matrix that are compatible with current neutrino oscillation data. Our search is based on the assumption that the neutrino mass matrix contains equal elements and a minimal number of parameters, in the flavour basis where the charged lepton mass matrix is diagonal and real. Three unique patterns that can successfully explain neutrino observables at the 3 sigma confidence level with just three physical parameters are presented. Neutrino textures described by four and five parameters are also studied. The predictions for the lightest neutrino mass, the effective mass parameter in neutrinoless double beta decays and for the CP-violating phases in the leptonic mixing are given.