Dark matter in a charged variant of the Scotogenic model

TL;DR

This paper explores a charged variant of the Scotogenic model linking dark matter and neutrino masses, showing scalar dark matter viability and potential new parameter regions due to charged fermions.

Contribution

It introduces a novel charged fermion and doublet extension to the Scotogenic model, analyzing its impact on dark matter and neutrino mass generation.

Findings

Scalar dark matter candidate remains viable.

Relic density can match observations in standard parameter regions.

Charged fermions may enable new viable parameter spaces.

Abstract

Scotogenic models are among the most popular possibilities to link dark matter and neutrino masses. In this work we discuss a variant of the Scotogenic model that includes charged fermions and a doublet with hypercharge $3/2$. Neutrino masses are induced at the one-loop level thanks to the states belonging to the dark sector. However, in contrast to the standard Scotogenic model, only the scalar dark matter candidate is viable in this version. After presenting the model and explaining some particularities about neutrino mass generation, we concentrate on its dark matter phenomenology. We show that the observed dark matter relic density can be correctly reproduced in the usual parameter space regions found for the standard Scotogenic model or the Inert Doublet model. In addition, the presence of the charged fermions may open up new regions, provided some tuning of the parameters is allowed.