Mixed Neutralino Dark Matter in Nonuniversal Gaugino Mass Models

Understand

We have considered nonuniversal gaugino mass models of supergravity, arising from a mixture of two superfield contributions to the gauge kinetic term, belonging to a singlet and a nonsinglet representation of the GUT group.

• In particular we analyse two models, where the contributing superfields belong to the singlet and the 75-dimensional, and the singlet and the 200-dimensional representations of SU(5).
• The resulting lightest superparticle is a mixed bino-higgsino state in the first case and a mixed bino-wino-higgsino state in the second.
• In both cases one obtains cosmologically compatible dark matter relic density over broad regions of the parameter space.