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

TL;DR

This paper introduces an extension to the standard model with exotic fermion and scalar multiplets, providing a unified framework to explain dark matter, neutrino masses, and baryon asymmetry through radiative mechanisms and CP-violating decays.

Contribution

It proposes a novel model with specific exotic multiplets that simultaneously addresses dark matter, neutrino masses, and baryon asymmetry within a renormalizable, gauge-invariant framework.

Findings

Dark matter candidate identified among the lightest exotic particles.

Neutrino masses generated radiatively at one-loop.

Baryon asymmetry produced via CP-violating decays of exotic particles.

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.