# Minimal Radiative Neutrino Masses

## TL;DR

This paper systematically searches for minimal radiative neutrino mass models based on the Weinberg operator, identifying a unique model with potential dark matter candidates and a novel loop-suppression mechanism.

## Contribution

It introduces a comprehensive classification of minimal radiative neutrino mass models and proves the uniqueness of a specific model with three fermionic representations.

## Key findings

- Identifies a unique minimal model with no new scalars for neutrino mass generation.
- Includes stable fractionally charged and coloured particles in the classification.
- Proposes a general fermionic ladder mechanism for loop suppression of neutrino masses.

## Abstract

We conduct a systematic search for neutrino mass models which only radiatively produce the dimension-5 Weinberg operator. We thereby do not allow for additional symmetries beyond the Standard Model gauge symmetry and we restrict ourselves to minimal models. We also include stable fractionally charged and coloured particles in our search. Additionally, we proof that there is a unique model with three new fermionic representations where no new scalars are required to generate neutrino masses at loop level. This model further has a potential dark matter candidate and introduces a general mechanism for loop-suppression of the neutrino mass via a fermionic ladder