Common Origin of Neutrino Mass, Dark Matter and Dirac Leptogenesis

Abstract

We study the possibility of generating tiny Dirac neutrino masses at one loop level through the \textit{scotogenic} mechanism such that one of the particles going inside the loop can be a stable cold dark matter (DM) candidate. Majorana mass terms of singlet fermions as well as tree level Dirac neutrino masses are prevented by incorporating the presence of additional discrete symmetries in a minimal fashion, which also guarantee the stability of the dark matter candidate. Due to the absence of total lepton number violation, the observed baryon asymmetry of the Universe is generated through the mechanism of Dirac leptogenesis where an equal and opposite amount of leptonic asymmetry is generated in the left and right handed sectors which are prevented from equilibration due to tiny Dirac Yukawa couplings. Dark matter relic abundance is generated through its usual freeze-out at a temperature much below the scale of leptogenesis. We constrain the relevant parameter space from neutrino mass, baryon asymmetry, Planck bound on dark matter relic abundance, and latest LUX bound on spin independent DM-nucleon scattering cross section. We also discuss the charged lepton flavour violation $(\mu \to e\gamma )$ and electric dipole moment of electron in this model in the light of the latest experimental data and constrain the parameter space of the model.

16 pages, 8 figures, matches the version accepted by JCAP

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Cited by in corpus (18)

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• Simplest Radiative Dirac Neutrino Mass Models
• Observable Lepton Number Violation with Predominantly Dirac Nature of Active Neutrinos
• Low scale Dirac leptogenesis and dark matter with observable $\Delta N_{\mathrm{eff}}$
• Unraveling the Scotogenic Model at Muon Collider
• ALP-portal majorana dark matter
• Asymmetric Self-interacting Dark Matter via Dirac Leptogenesis
• Dark Matter in the Type Ib Seesaw Model
• Collider and CMB complementarity of leptophilic dark matter with light Dirac neutrinos
• S.M.A.S.H.E.D.: Standard Model Axion Seesaw Higgs Inflation Extended for Dirac Neutrinos
• Singlet fermion dark matter and Dirac neutrinos from Peccei-Quinn symmetry
• 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
• Probing High Scale Dirac Leptogenesis via Gravitational Waves from Domain Walls
• Theory and phenomenology of Dirac neutrinos
• Cogenesis of visible and dark matter in type-I Dirac seesaw