Singlet fermionic dark matter

TL;DR

This paper introduces a renormalizable model for fermionic dark matter involving a singlet Dirac fermion and scalar, explaining relic abundance and discussing collider and direct detection implications.

Contribution

It presents a novel minimal model where a singlet fermion interacts via scalar mixing, providing a weakly interacting massive particle (WIMP) candidate for dark matter.

Findings

Relic abundance of dark matter explained within the model

Predicted elastic scattering cross section for direct detection

Constraints on model parameters from detection experiments

Abstract

We propose a renormalizable model of a fermionic dark matter by introducing a gauge singlet Dirac fermion and a real singlet scalar. The bridges between the singlet sector and the standard model sector are only the singlet scalar interaction terms with the standard model Higgs field. The singlet fermion couples to the standard model particles through the mixing between the standard model Higgs and singlet scalar and is naturally a weakly interacting massive particle (WIMP). The measured relic abundance can be explained by the singlet fermionic dark matter as the WIMP within this model. Collider implication of the singlet fermionic dark matter is also discussed. Predicted is the elastic scattering cross section of the singlet fermion into target nuclei for a direct detection of the dark matter. Search of the direct detection of the dark matter provides severe constraints on the parameters of our model.