SUSY Dark Matter in Nonuniversal Gaugino Mass Models

TL;DR

This paper explores supersymmetric dark matter models with nonuniversal gaugino masses, analyzing their phenomenology, relic density predictions, and experimental signatures at LHC and dark matter detectors.

Contribution

It introduces a simple, predictive GUT-scale model with nonuniversal gaugino masses that can evade LEP constraints and produce viable dark matter relic densities.

Findings

Mixed gaugino-higgsino dark matter can achieve correct relic density.

Wino dark matter at 4 TeV can explain PAMELA positron excess.

Model predictions are testable at LHC and dark matter experiments.

Abstract

We discuss the SUSY dark matter phenomenology in some simple and predictive models of nonuniversal gaugino masses at the GUT scale. Assuming the gaugino masses to transform as a sum of singlet and a nonsinglet representation of the GUT group SU(5), one can evade the LEP constraints to access the bulk annihilation region of the bino dark matter relic density. Besides, with this assumption one can also have a mixed gaugino-higgsino dark matter, giving the right relic density over large parts of the parameter space. We consider the model predictions for LHC and dark matter experiments in both the cases. Finally we consider the AMSB model prediction of wino dark matter giving the right relic density for TeV scale wino mass. Assuming this wino dark matter mass to be at the first Sommerfeld resonance of about 4 TeV one can simultaneously reproduce the right relic density as well as the hard positron spectrum observed by the PAMELA experiment.