Revisiting the R$\nu$MDM Models

TL;DR

This paper revisits RνMDM models that unify neutrino mass generation with dark matter, analyzing their phenomenology and viability, especially focusing on models with approximate Z2 symmetry and potential detection prospects.

Contribution

It provides a detailed study of RνMDM models with approximate Z2 symmetry, exploring their particle content, dark matter candidate, and experimental testability.

Findings

Exact Z2 symmetry is ruled out in these models.

The fermionic quintuplet's neutral component is a viable dark matter candidate.

Future experiments could test the dark matter predictions of these models.

Abstract

Combining neutrino mass generation and a dark matter candidate in a unified model has always been intriguing. We revisit the class of R$\nu$MDM models, which incorporate minimal dark matter in radiative neutrino mass models based on the one-loop ultraviolet completions of the Weinberg operator. The possibility of an exact accidental $Z_2$ is completely ruled out in this scenario. We study the phenomenology of one of the models with an approximate $Z_2$ symmetry. In addition to the Standard Model particles, it contains two real scalar quintuplets, one vector- like quadruplet fermion and a fermionic quintuplet. The neutral component of the fermionic quintuplet serves as a good dark matter candidate which can be tested by the future direct and indirect detection experiments. The constraints from flavor physics and electroweak-scale naturalness are also discussed.