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.
Highlights
The existence and prevalence of dark matter (DM) remains one of the most glaring gaps in the modern understanding of physics [1,2]
The annihilation rate for the Higgsino weakly interacting massive particle (WIMP) varies only with its mass, so such experiments can detect the Higgsino for arbitrarily high gaugino masses. (D) This region is accessible to future e-Electric dipole moment (EDM) experiments and direct detection, like Advanced Advanced Cold Molecular Electron EDM (ACME) and LZ respectively
These two methods complement each other, as the electric dipole moment (e-EDM) does not depend on the likelihood for a DM particle to collide with another particle, while direct detection does not depend on complex phases and varies differently with model parameters
Summary
The existence and prevalence of dark matter (DM) remains one of the most glaring gaps in the modern understanding of physics [1,2]. (ii) Flavor changing neutral current experiments place precise limits on new flavor physics not protected by some version of the Glashow-Iliopoulos-Maiani mechanism [6,7]. Such constructions are not generically expected, and imply harsh constraints on SUSY models [8,9,10]. (iv) Electric dipole moment (EDM) measurements limit the CP violation of new physics, which can be generically large in SUSY models, with large EDMs arising from one-loop corrections involving scalar superpartners [15,16]. We currently appear to be at the verge of reaching this theory space with real data
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