Bino-Higgsino Mixed Dark Matter in a Focus Point Gaugino Mediation

TL;DR

This paper explores a specific neutralino dark matter model within focus point gaugino mediation, showing it can match observed dark matter density and be tested by upcoming experiments, with implications for supersymmetry parameters.

Contribution

It demonstrates that a Bino-Higgsino mixed neutralino in this model can account for dark matter and predicts testable signals in future direct detection experiments, linking to R-symmetry considerations.

Findings

Neutralino relic abundance matches observed dark matter density.

Predicted spin-independent cross section is near current experimental limits.

The gluino to wino mass ratio is fixed at 3/8 by a non-anomalous discrete R-symmetry.

Abstract

We investigate the neutralino dark matter in the focus point gaugino mediation model with the O(100) GeV gravitino. The thermal relic abundance of the neutralino with a sizable Higgsino fraction can explain the dark matter density at the present universe. The spin-independent cross section is marginally consistent with the current upper limit from the XENON 100 experiment, and the whole parameter region can be covered at the XENON1T experiment. We also discuss the origin of the gluino mass to wino mass ratio at around 3/8, which is crucial for the mild fine-tuning in the electroweak symmetry breaking sector. It is shown that the existence of the non-anomalous discrete R-symmetry can fix this ratio to 3/8.