Race to find 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.

TASI Lectures on the Particle Physics and Astrophysics of Dark Matter

“…As discovering a WIMP with a direct detection cross-section below the neutrino floor is remarkably challenging, indirect detection emerges as a promising discovery channel. Other ways the higgsino could be detected, however, include from direct production at colliders or indirectly through electric dipole moments (see, e.g., [86,94]). The indirect signatures of higgsino DM annihilation are straightforward to compute.…”

Higgsino Dark Matter Confronts 14 years of Fermi Gamma Ray Data

“…gamma-ray telescope [6,10]. Nearly-pure higgsino LSPs, on the other hand, remain one of the better motivated and sought after, yet unprobed, DM scenarios (see, e.g., [11] for a recent summary). Higgsinos, which are the superpartners of the two Higgs doublets in the minimal supersymmetric standard model (MSSM), are especially motivated in light of (i) null results for wino DM, and (ii) the fact that null searches for superpartners at e.g.…”