Fermion masses and mixings in an $SU(5)$ grand unified model with an extra flavor symmetry

Abstract

We propose a model based on the $SU(5)$ grand unification with an extra $A_4\otimes Z_2\otimes Z_2^{\prime }\otimes Z_2^{\prime \prime }\otimes U{\left(1\right)}_f$ flavor symmetry, which accounts for the pattern of the SM fermion masses and mixings. The observed hierarchy of charged fermion masses and quark mixing matrix elements arises from a generalized Froggatt-Nielsen mechanism triggered by a scalar $24$ representation of $SU(5)$ charged under the global $U(1{)}_f$ and acquiring a VEV at the GUT scale. The light neutrino masses are generated via a radiative seesaw mechanism with a single heavy Majorana neutrino and neutral scalars running in the loops. The model predictions for both quark and lepton sectors are in good agreement with the experimental data. The model predicts an effective Majorana neutrino mass, relevant for neutrinoless double beta decay, with values $m_{\beta \beta }=$ 4 and 50 meV for the normal and the inverted neutrino spectrum, respectively. The model also features a suppression of CP violation in neutrino oscillations, a low scale for the heavy Majorana neutrino (few TeV) and, due to the unbroken $Z_2$ symmetry, a natural dark matter candidate.

arXiv comment15 pages, 1 figure. Improved version. Version for publication in Physical Review D. arXiv admin note: text overlap with arXiv:1307.6499

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