Signatures of Majorana dark matter with t-channel mediators

TL;DR

This paper explores a simplified Majorana dark matter model with a scalar mediator, analyzing its observational signatures and the complementarity of detection strategies, especially in the context of thermal freeze-out production.

Contribution

It provides a comprehensive review of the signatures of Majorana dark matter with t-channel mediators and discusses the combined potential of different search strategies.

Findings

Experimental sensitivities are approaching levels capable of detecting such dark matter.

The model's signatures vary across direct, indirect, and collider searches, offering multiple detection avenues.

Thermal freeze-out remains a well-motivated production mechanism for this dark matter scenario.

Abstract

Three main strategies are being pursued to search for non-gravitational dark matter signals: direct detection, indirect detection and collider searches. Interestingly, experiments have reached sensitivities in these three search strategies which may allow detection in the near future. In order to take full benefit of the wealth of experimental data, and in order to confirm a possible dark matter signal, it is necessary to specify the nature of the dark matter particle and of the mediator to the Standard Model. In this paper, we focus on a simplified model where the dark matter particle is a Majorana fermion that couples to a light Standard Model fermion via a Yukawa coupling with a scalar mediator. We review the observational signatures of this model and we discuss the complementarity among the various search strategies, with emphasis in the well motivated scenario where the dark matter particles are produced in the early Universe via thermal freeze-out.