Dark matter and lepton flavour phenomenology in a singlet-doublet scotogenic model

TL;DR

This paper explores a scotogenic model extending the Standard Model with scalar and fermionic singlets and doublets, generating neutrino masses radiatively and providing viable dark matter candidates, analyzed through parameter scans and phenomenological implications.

Contribution

It introduces a detailed phenomenological analysis of a singlet-doublet scotogenic model focusing on fermionic dark matter, including parameter space exploration and collider implications.

Findings

Fermionic dark matter candidates are likely just above 1 TeV in mass.

The model successfully explains neutrino masses and dark matter within experimental constraints.

Specific mass spectra are predicted for fermionic dark matter in this framework.

Abstract

We study the dark matter phenomenology of scotogenic frameworks through a rather illustrative model extending the Standard Model by scalar and fermionic singlets and doublets. Such a setup is phenomenologically attractive since it provides the radiative generation of neutrino masses, while also including viable candidates for cold dark matter. We employ a Markov Chain Monte Carlo algorithm to explore the associated parameter space in view of numerous constraints stemming from the Higgs mass, the neutrino sector, dark matter, and lepton-flavour violating processes. After a general discussion of the results, we focus on the case of fermionic dark matter, which remains rather uncovered in the literature so far. We discuss the associated phenomenology and show that in this particular case a rather specific mass spectrum is expected with fermion masses just above 1 TeV. Our study may serve as a guideline for future collider studies.