The Race to Find Split Higgsino Dark Matter

TL;DR

This paper explores split higgsino models as dark matter candidates, analyzing their detectability through current and future experiments, and highlighting promising discovery prospects in upcoming electron electric dipole moment measurements.

Contribution

It provides a comprehensive analysis of split higgsino dark matter models, emphasizing their experimental signatures and discovery potential in upcoming detection experiments.

Findings

Split higgsinos can account for dark matter within current experimental constraints.

Next-generation experiments have significant potential to detect split higgsino signals.

Parameter space analysis guides future experimental searches for split higgsino dark matter.

Abstract

Split higgsinos are a compelling class of models to explain dark matter and may be on the verge of detection by multiple current experimental avenues. The idea is based on a large split in scales between the electroweak scale and decoupled scalars, with relatively light higgsinos between the two. Such models enjoy the merit of depending on very few parameters while still explaining gauge coupling unification, dark matter, and most of the hierarchy between the Planck and electroweak scales, and they remain undetected by past experiments. We analyze split higgsinos in view of current and next generation experiments. We discuss the direct and indirect detection prospects and further demonstrate promising discovery potentials in the upcoming electron electric dipole moment experiments. The parameter space of this model is analyzed in terms of experiments expected to run in the coming years and where we should be looking for the next potential discoveries.