The top squark-mediated annihilation scenario and direct detection of dark matter in compressed supersymmetry

TL;DR

This paper explores how top squark-mediated annihilation of bino-like neutralinos can naturally produce the observed dark matter abundance in compressed supersymmetry models and discusses promising prospects for direct detection in future experiments.

Contribution

It provides a detailed analysis of the parameter space where top squark-mediated annihilation explains dark matter and compares it to other scenarios, highlighting detection prospects.

Findings

Top squark-mediated annihilation can account for dark matter abundance.

Compressed supersymmetry models naturally realize this scenario.

Future experiments have promising detection prospects.

Abstract

Top squark-mediated annihilation of bino-like neutralinos to top-antitop pairs can play the dominant role in obtaining a thermal relic dark matter abundance in agreement with observations. In a previous paper, it was argued that this can occur naturally in models of compressed supersymmetry, which feature a running gluino mass parameter that is substantially smaller than the wino mass parameter at the scale of apparent gauge coupling unification. Here I study in some more detail the parameter space in which this is viable, and compare to other scenarios for obtaining the observed dark matter density. I then study the possibility of detecting the dark matter directly in future experiments. The prospects are consistently very promising for a wide variety of model parameters within this scenario.