Realistic Neutrinogenesis with Radiative Vertex Correction

Abstract

We propose a new model for naturally light Dirac neutrinos and explain the baryon asymmetry of the universe through neutrinogenesis. We extend the standard model with a real singlet scalar, a heavy singlet Dirac fermion and a heavy doublet scalar besides three right-handed neutrinos, respecting lepton number conservation and a Z_2 symmetry. The neutrinos acquire small Dirac masses due to the suppression of the weak scale over the heavy mass scale. As a key feature of our construction, once the heavy Dirac fermion and doublet scalar go out of equilibrium, their decays induce the CP asymmetry from the interference of tree-level processes with the \textit{radiative vertex corrections} (rather than the self-energy corrections). Although there is no lepton number violation, an equal and opposite amount of CP asymmetry is generated in the left-handed and the right-handed neutrinos. The left-handed lepton asymmetry would then be converted to the baryon asymmetry in the presence of the sphalerons, while the right-handed lepton asymmetry remains unaffected.

7 pages, 3 figures. Version accepted by PLB (minor rewording, refs added)

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• Seesaw roadmap to neutrino mass and dark matter
• WIMP Dark Matter and Baryogenesis
• Naturally Small Dirac Neutrino Mass with Intermediate $SU(2{)}_L$ Multiplet Fields
• Common Origin of Neutrino Mass, Dark Matter and Dirac Leptogenesis
• Minimal radiative Dirac neutrino mass models
• Pseudo-Majoron as Dark Matter
• Extended Zee model for Neutrino Mass, Leptogenesis and Sterile Neutrino like Dark Matter
• From Dirac neutrino masses to baryonic and dark matter asymmetries
• Alternative formulation of left-right symmetry with $B-L$ conservation and purely Dirac neutrinos
• Resonant Dirac leptogenesis on throats
• Neutrinoless Double-$\beta$ Decay with Nonstandard Majoron Emission
• Dark matter assisted Dirac leptogenesis and neutrino mass
• Searching for Nambu-Goldstone Bosons at the LHC
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• Peccei-Quinn symmetry for Dirac seesaw and leptogenesis
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• An SO(10) \times SO(10)' model for common origin of neutrino masses, ordinary and dark matter-antimatter asymmetries
• Probing High Scale Dirac Leptogenesis via Gravitational Waves from Domain Walls
• B-L Conserved Baryogenesis