Exotic fermion multiplets as a solution to baryon asymmetry, dark matter and neutrino masses

Abstract

We propose an extension to the standard model where three exotic fermion 5-plets and one scalar 6-plet are added to the particle content. By demanding that all interactions are renormalizable and standard model gauge invariant, we show that the lightest exotic particle in this model can be a dark matter candidate as long as the new 6-plet scalar does not develop a nonzero vacuum expectation value. Furthermore, light neutrino masses are generated radiatively at one-loop while the baryon asymmetry is produced by the CP-violating decays of the second lightest exotic particle. We have demonstrated using concrete examples that there is a parameter space where a consistent solution to the problems of baryon asymmetry, dark matter and neutrino masses can be obtained.

17 pages, 2 figures (REVTeX4.1), v2: some refs added, v3: typos corrected, Sec.VI.B, C modified, this version to appear in PRD

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• Mixed Inert Scalar Triplet Dark Matter, Radiative Neutrino Masses and Leptogenesis
• Leptogenesis, radiative neutrino masses and inert Higgs triplet dark matter
• From high-scale leptogenesis to low-scale one-loop neutrino mass generation
• One-loop Type II Seesaw Neutrino Model with Stable Dark Matter Candidates