Lepton masses and mixing in $SU(3{)}_C\otimes SU(3{)}_L\otimes U(1{)}_X$ models with a $S_3$ flavor symmetry

Abstract

We propose a model based on the gauge group $SU(3{)}_C\otimes SU(3{)}_L\otimes U(1{)}_X$ with an extra $S_3$ flavor symmetry, which accounts for the lepton masses and mixing. The small active neutrino masses are generated via a double seesaw mechanism. In this scenario, the spectrum of neutrinos presents very light, light and very heavy masses. The model predicts a quasidegenerate normal hierarchy active neutrino mass spectrum and the relation $\Delta m_{21}^2\ll \Delta m_{31}^2$ arises from effective six-dimensional operators. The obtained neutrino mixing parameters are in agreement with the neutrino oscillation experimental data. We find CP violation in neutrino oscillations with a Jarlskog invariant of about $10^{-2}$.

14 pages. Version for publication in Physical Review D

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• Contribution of heavy neutrinos to decay of standard-model-like Higgs boson $h\to \mu \tau$ in a 3-3-1 model with additional gauge singlets
• An extended 3-3-1 model with two scalar triplets and linear seesaw mechanism
• Phenomenological aspects of the fermion and scalar sectors of a $S_4$ flavored 3-3-1 model
• Large signal of $h\to \mu \tau$ within the constraints of $e_i\to e_j\gamma$ decays in the 3-3-1 model with neutral leptons
• A non-renormalizable neutrino mass model with ${\mathbf{S}}_3\otimes {\mathbf{Z}}_2$ symmetry
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• A lepton model with nearly Cobimaximal mixing
• Scalar and gauge sectors in the 3-Higgs Doublet Model under the S3-symmetry