Resonant leptogenesis and tribimaximal leptonic mixing with A4 symmetry

Abstract

We investigate the viability of thermal leptogenesis in type-I seesaw models with leptonic flavour symmetries that lead to tribimaximal neutrino mixing. We consider an effective theory with an A4 x Z3 x Z4 symmetry, which is spontaneously broken at a scale much higher than the electroweak scale. At the high scale, leptonic Yukawa interactions lead to exact tribimaximal mixing and the heavy Majorana neutrino mass spectrum is exactly degenerate. In this framework, leptogenesis becomes viable once this degeneracy is lifted either by renormalization group effects or by a soft breaking of the A4 symmetry. The implications for low-energy neutrino physics are discussed.

14 pages, 15 figures; final version to appear in Phys. Rev. D

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• A dynamical approach to link low energy phases with leptogenesis
• A direct link between neutrinoless double beta decay and leptogenesis in a seesaw model with $S_4$ symmetry
• Tri-bimaximal Mixing and Cabibbo Angle in S4 Flavor Model with SUSY
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• Quasidegeneracy of Majorana Neutrinos and the Origin of Large Leptonic Mixing
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• Diagonal reflection symmetries, four-zero texture, and trimaximal mixing with predicted ${\theta }_{13}$ in an $A_4$ symmeric model
• Flavored Leptogenesis and Neutrino Mass with $A_4$ Symmetry
• On the collider-testability of the type-I seesaw model with 3 right-handed neutrinos
• Nonzero ${\theta }_{13}$ in $SO(3)\to A_4$ lepton models