A model of neutrino mass and dark matter with large neutrinoless double beta decay

TL;DR

This paper introduces a new particle physics model where neutrino masses are generated at three loops, but neutrinoless double beta decay occurs at one loop, allowing observable decay signals despite tiny neutrino masses, and also provides a dark matter candidate.

Contribution

The model uniquely combines three-loop neutrino mass generation with one-loop neutrinoless double beta decay, and predicts new scalars accessible at colliders, while addressing dark matter.

Findings

Large neutrinoless double beta decay possible with small neutrino masses.

Model constrains from neutrino data and lepton flavor violation.

Presence of new scalars below TeV scale and a dark matter candidate.

Abstract

We propose a model where neutrino masses are generated at three loop order but neutrinoless double beta decay occurs at one loop. Thus we can have large neutrinoless double beta decay observable in the future experiments even when the neutrino masses are very small. The model receives strong constraints from the neutrino data and lepton flavor violating decays, which substantially reduces the number of free parameters. Our model also opens up the possibility of having several new scalars below the TeV regime, which can be explored at the collider experiments. Additionally, our model also has an unbroken $Z_2$ symmetry which allows us to identify a viable Dark Matter candidate.