Split Dirac Supersymmetry: An Ultraviolet Completion of Higgsino Dark Matter

Abstract

Motivated by the observation that the Higgs quartic coupling runs to zero at an intermediate scale, we propose a new framework for models of split supersymmetry, in which gauginos acquire intermediate scale Dirac masses of $\sim 10^{8-11}$ GeV. Scalar masses arise from one-loop finite contributions as well as direct gravity-mediated contributions. Like split supersymmetry, one Higgs doublet is fine-tuned to be light. The scale at which the Dirac gauginos are introduced to make the Higgs quartic zero is the same as is necessary for gauge coupling unification. Thus, gauge coupling unification persists (nontrivially, due to adjoint multiplets), though with a somewhat higher unification scale $\gtrsim 10^{17}$ GeV. The $\mu$-term is naturally at the weak scale, and provides an opportunity for experimental verification. We present two manifestations of Split Dirac Supersymmetry. In the "Pure Dirac" model, the lightest Higgsino must decay through R-parity violating couplings, leading to an array of interesting signals in colliders. In the "Hypercharge Impure" model, the bino acquires a Majorana mass that is one-loop suppressed compared with the Dirac gluino and wino. This leads to weak scale Higgsino dark matter whose overall mass scale, as well as the mass splitting between the neutral components, is naturally generated from the same UV dynamics. We outline the challenges to discovering pseudo-Dirac Higgsino dark matter in collider and dark matter detection experiments.

30 pages, 5 figures

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• $t\bar{t}t\bar{t}$ signatures through the lens of color-octet scalars
• Constrained Dirac gluino mediation
• Dark Matter Detection, Standard Model Parameters, and Intermediate Scale Supersymmetry
• Dirac gaugino from grand gauge-Higgs unification
• Electroweak Phase Transitions with BSM Fermions
• New Calculations in Dirac Gaugino Models: Operators, Expansions, and Effects
• Inelastic dark matter scattering off Thallium cannot save DAMA
• Light Higgsino for Gauge Coupling Unification
• Earth-Catalyzed Detection of Magnetic Inelastic Dark Matter with Photons in Large Underground Detectors