Light Sterile Neutrino and Dark Matter in Left-Right Symmetric Models Without Higgs Bidoublet

Abstract

We present a class of left-right symmetric models where Dirac as well as Majorana mass terms of neutrinos can arise at one-loop level in a scotogenic fashion: with dark matter particles going inside the loop. We show the possibility of naturally light right handed neutrinos that can have interesting implications at neutrinoless double beta decay experiments as well as cosmology. Apart from a stable dark matter candidate stabilised by a remnant $Z_2$ symmetry, one can also have a long lived keV sterile neutrino dark matter in these models. This class of models can have very different collider signatures compared to the conventional left-right models.

Version 2: Minor changes, to appear in Phys. Rev. D

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• Observable Lepton Number Violation with Predominantly Dirac Nature of Active Neutrinos
• Observing Left-Right Symmetry in the Cosmic Microwave Background
• Collider and CMB complementarity of leptophilic dark matter with light Dirac neutrinos
• Texture zeros of low-energy Majorana neutrino mass matrix in 3+1 scheme
• $B-L$ model with $A_4\times Z_3\times Z_4$ symmetry for $3+1$ active$-$sterile neutrino mixing
• Unified Origin of Dirac Neutrino and Asymmetric Dark Matter Masses via a Dirac-Type Leptogenesis
• Dirac Neutrinos and Dark Matter within a Minimal Discrete Symmetry Model