Minimal Decaying Dark Matter and the LHC

TL;DR

This paper explores a minimal decaying dark matter model with two new particles, analyzing its relic density, indirect detection prospects, and collider signals, highlighting two distinct dark matter regimes and their experimental signatures.

Contribution

It introduces a minimal dark matter model without stabilizing symmetry, identifying parameter regions compatible with relic density and detection prospects, and discusses collider signatures for different dark matter types.

Findings

Identified parameter regions for FIMP/SuperWIMP and WIMP dark matter.

Predicted collider signals and methods to measure couplings.

Showed compatibility with observed relic density and indirect detection sensitivity.

Abstract

We consider a minimal Dark Matter model with just two additional states, a Dark Matter Majorana fermion and a colored or electroweakly charged scalar, without introducing any symmetry to stabilize the DM state. We identify the parameter region where an indirect DM signal would be within the reach of future observations and the DM relic density generated fits the observations. We find in this way two possible regions in the parameter space, corresponding to a FIMP/SuperWIMP or a WIMP DM. We point out the different collider signals of this scenario and how it will be possible to measure the different couplings in case of a combined detection.