Neutrino mass, Dark Matter and Baryon Asymmetry via TeV-Scale Physics without Fine-Tuning

TL;DR

This paper introduces a TeV-scale extended standard model that simultaneously explains neutrino masses, dark matter stability, and baryon asymmetry without fine-tuning, and makes testable predictions for collider experiments.

Contribution

It presents a novel model generating tiny neutrino masses at three loops with an exact $Z_2$ symmetry, linking dark matter stability and baryogenesis without unnatural hierarchies.

Findings

Neutrino masses generated at three-loop level.

Dark matter stability guaranteed by $Z_2$ symmetry.

Model predicts distinctive Higgs phenomenology testable at colliders.

Abstract

We propose an extended version of the standard model, in which neutrino oscillation, dark matter, and baryon asymmetry of the Universe can be simultaneously explained by the TeV-scale physics without assuming unnatural hierarchy among the mass scales. Tiny neutrino masses are generated at the three loop level due to the exact $Z_2$ symmetry, by which stability of the dark matter candidate is guaranteed. The extra Higgs doublet is required not only for the tiny neutrino masses but also for successful electroweak baryogenesis. The model provides discriminative predictions especially in Higgs phenomenology, so that it is testable at current and future collider experiments.