Phenomenological profile of scotogenic fermionic dark matter

TL;DR

This paper investigates fermionic dark matter in the scotogenic model, analyzing its relic abundance, detection prospects, and constraints, highlighting the importance of coannihilation effects for viable dark matter masses.

Contribution

It provides a detailed phenomenological analysis of fermionic dark matter in the singlet-triplet scotogenic model, emphasizing coannihilation effects and experimental constraints.

Findings

Viable dark matter below 60 GeV is excluded by experimental constraints.

Fermion-scalar coannihilation enables dark matter in the 60-100 GeV range.

Coannihilation effects are crucial for dark matter masses above 100 GeV.

Abstract

We consider the possibility that neutrino masses arise from the exchange of dark matter states. We examine in detail the phenomenology of fermionic dark matter in the singlet-triplet scotogenic reference model. We explore the case of singlet-like fermionic dark matter, taking into account all co-annihilation effects relevant for determining its relic abundance, such as fermion-fermion and scalar-fermion co-annihilation. Although this in principle allows for dark matter below 60 GeV, the latter is in conflict with charged lepton flavour violation (cLFV) and/or collider physics constraints. We examine the prospects for direct dark matter detection in upcoming experiments up to 10 TeV. Fermion-scalar coannihilation is needed to obtain viable fermionic dark matter in the 60-100 GeV mass range. Fermion-fermion and fermion-scalar coannihilation play complementary roles in different parameter regions above 100 GeV.