Renormalization group running triggered tri-resonant leptogenesis within neutrino flavor-symmetry models

Abstract

In this paper, we have studied the consequences of some representative neutrino flavor-symmetry models for tri-resonant leptogenesis (which is realized by having three nearly degenerate right-handed neutrinos). To be specific, we have considered a neutrino flavor-symmetry model realizing the TM1 mixing and modular ${\mathrm{A}}_4^{}$, ${\mathrm{S}}_4^{}$ and ${\mathrm{A}}_5^{}$ symmetry models that have a right-handed neutrino mass matrix $M_{\mathrm{R}}^{}$ as shown in Eq.~(\ref{6}) which gives three exactly degenerate right-handed neutrino masses and consequently prohibits the leptogenesis mechanism to work successfully. For these models, we study the scenario that the desired right-handed neutrino mass splittings for leptogenesis to work are generated from the renormalization-group running effects. In such a scenario, we explore the parameter space that allows for the reproduction of the observed baryon-antibaryon asymmetry of the Universe.

20 pages, 9 figures, version accepted for publication in EPJC

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