Predictions of a Natural SUSY Dark Matter Model for Direct and Indirect Detection Experiments

TL;DR

This paper predicts that a specific natural SUSY dark matter model aligns with current direct detection limits and suggests a detectable indirect positron signal similar to PAMELA observations.

Contribution

It introduces a minimal SUSY-GUT model with nonuniversal gaugino masses predicting dark matter detection signals consistent with current bounds and potential signals for future experiments.

Findings

Direct detection rates below current limits but within future experiment reach.

Predicted positron spectrum matches PAMELA observations.

Model provides a natural SUSY dark matter explanation.

Abstract

The most natural region of cosmologically compatible dark matter relic density in terms of low fine-tuning in a minimal supersymmetric standard model with nonuniversal gaugino masses is the so called bulk annihilation region. We study this region in a simple and predictive SUSY-GUT model of nonuniversal gaugino masses, where the latter transform as a combination of singlet plus a nonsinglet representation of the GUT group SU(5). The model prediction for the direct dark matter detection rates is well below the present CDMS and XENON100 limits, but within the reach of a future 1Ton XENON experiment. The most interesting and robust model prediction is an indirect detection signal of hard positron events, which resembles closely the shape of the observed positron spectrum from the PAMELA experiment.