A radiative seesaw model with GeV singlet-doublet fermion and TeV triplet scalar dark matter

TL;DR

This paper proposes a radiative seesaw model extending the Standard Model with singlet-doublet fermions and triplet scalars, aiming to unify dark matter, neutrino masses, and gauge coupling unification, and analyzes its experimental viability.

Contribution

It introduces a novel radiative seesaw model with specific fermion and scalar content, exploring its parameter space under multiple experimental constraints.

Findings

Dark matter is fermionic below 1 TeV and scalar above

High complementarity between direct detection and lepton flavor violation experiments

Model can simultaneously address dark matter, neutrino masses, and gauge unification

Abstract

By extending the Standard Model with singlet-doublet fermions and triplet scalars, all odd under a new $Z_2$ symmetry, we introduce a radiative seesaw model that can simultaneously account for dark matter, explain the existence of neutrino masses and allow for gauge coupling unification. We explore the viable parameter space of the model after imposing collider, Higgs mass, dark matter, neutrino mass and lepton flavour violation constraints. We find that dark matter in this model is fermionic for masses below about 1 TeV and scalar above and observe a high degree of complementarity between direct detection and lepton flavour violation experiments, which should soon allow to fully probe the fermionic dark matter sector and at least partially the scalar dark matter sector.