# Singlet-doublet/triplet dark matter and neutrino masses

## TL;DR

This paper explores a simple extension of the Standard Model that combines singlet-doublet fermion and triplet scalar fields to explain dark matter and neutrino masses, analyzing constraints and experimental prospects.

## Contribution

It introduces a unified model for dark matter and neutrino masses, analyzing its parameter space and experimental signatures, including gauge coupling unification and lepton flavor violation.

## Key findings

- Fermionic dark matter below 1 TeV and scalar above 1 TeV.
- High complementarity between direct detection and LFV experiments.
- Model allows gauge coupling unification.

## Abstract

In these proceedings, we present a study of a combined singlet--doublet fermion and triplet scalar model for dark matter (DM). Together, these models form a simple extension of the Standard Model (SM) that can account for DM and explain the existence of neutrino masses, which are generated radiatively. However, this also implies the existence of lepton flavour violating (LFV) processes. In addition, this particular model allows for gauge coupling unification. The new fields are odd under a new $\mathbb{Z}_2$ symmetry to stabilise the DM candidate. We analyse the DM, neutrino mass and LFV aspects, exploring the viable parameter space of the model. This is done using a numerical random scan imposing successively the neutrino mass and mixing, relic density, Higgs mass, direct detection, collider and LFV constraints. We find that DM in this model is fermionic for masses below about 1 TeV and scalar above. We observe a high degree of complementarity between direct detection and LFV experiments, which should soon allow to fully probe the fermionic DM sector and at least partially the scalar DM sector.