Neutrino mass hierarchy and the origin of leptonic flavor mixing from the right-handed sector

Abstract

We consider a neutrino mass model where all leptonic mixing is induced by a heavy Majorana sector through the seesaw type I mechanism, while the Dirac mass matrices are diagonal. Such a pattern occurs naturally in grand unified theories. Constraints on the parameters of the models are considered and it is shown that a normal neutrino mass hierarchy is preferred. The lightest neutrino mass is typically small, leading to nonobservable rates for neutrinoless double beta decay in the normal hierarchy case.

arXiv comment6 pages, 2 figures

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• The $\Delta (27)$ flavor 3-3-1 model with neutral leptons
• A variant of 3-3-1 model for the generation of the SM fermion mass and mixing pattern
• A novel Randall-Sundrum model with $S_3$ flavor symmetry
• Leptogenesis and $CP$ violation in $SU(5)$ models with lepton flavor mixing originating from the right-handed sector
• Knotted strings and leptonic flavor structure