Observable Lepton Number Violation with Predominantly Dirac Nature of Active Neutrinos

Abstract

We study a specific version of $SU(2{)}_R\times SU(2{)}_L\times U(1{)}_{B-L}$ models extended by discrete symmetries where the new physics sector responsible for tiny neutrino masses at leading order remains decoupled from the new physics sector that can give rise to observable signatures of lepton number violation such as neutrinoless double beta decay. More specifically, the dominant contribution to light neutrino masses comes from a one-loop Dirac mass. At higher loop level, a tiny Majorana mass also appears which remains suppressed by many order of magnitudes in comparison to the Dirac mass. Such a model where the active neutrinos are predominantly of Dirac type, also predicts observable charged lepton flavour violation like $\mu \to 3e,\mu \to e\gamma$ and multi-component dark matter.

33 pages, 16 figures, to appear in JHEP

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Cited by in corpus (4)

• From the trees to the forest: a review of radiative neutrino mass models
• Simplest Radiative Dirac Neutrino Mass Models
• Observing Left-Right Symmetry in the Cosmic Microwave Background
• Unified Origin of Dirac Neutrino and Asymmetric Dark Matter Masses via a Dirac-Type Leptogenesis