Light Higgsino Dark Matter in the MSSM on D-branes
Van E. Mayes, Andrew W. Lutz

TL;DR
This paper explores a specific supersymmetry breaking scenario in the MSSM derived from D-branes, identifying parameter regions with light Higgsino-like dark matter candidates that satisfy experimental constraints and have detectable direct detection signals.
Contribution
It demonstrates the existence of viable MSSM spectra with light Higgsino-like LSPs in D-brane models, including detailed parameter space analysis and phenomenological implications.
Findings
Higgsino-like LSPs with masses 230-350 GeV are viable.
Predicted direct detection cross-sections are within reach of future experiments.
Relic density of the LSP is sub-dominant, about ten times below cosmological bounds.
Abstract
When supersymmetry breaking is dominated by the complex structure moduli and the universal dilaton, a subset of the supersymmetry parameter space in a realistic MSSM constructed from intersecting/magnetized D-branes are universal, similar to the effective mSUGRA/CMSSM parameter space with a universal scalar mass m_0, a universal gaugino mass and with the universal trilinear term fixed to be minus the gaugino mass, A_0=-m_{1/2}. More generally, the scalar mass-squared terms for sfermions are split about the Higgs mass-squared terms, m_{Q_L,L_L}^2=m_H^2 - Delta m^2 and m_{Q_R,L_R}^2=m_H^2 + \Delta m^2, for generic values of the Kahler moduli. The scalar masses are universal only for a specific choice of the Kahler moduli. The hyberbolic branch/focus point (HB/FP) regions of this parameter space are present for both Delta m^2 = 0$ and \Delta m^2 \ne 0. Interestingly, It is shown…
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