Leptogenesis origin of Dirac gaugino dark matter
arXiv:1009.0983 · doi:10.1103/PhysRevD.83.053004
Abstract
The Dirac nature of the gauginos (and also the Higgsinos) can be realized in -symmetric supersymmetry models. In this class of models, the Dirac bino (or wino) with a small mixture of the Dirac Higgsinos is a good dark matter candidate. When the seesaw mechanism with Higgs triplet superfields is implemented to account for the neutrino masses and mixing, the leptogenesis driven by the heavy triplet decay is shown to produce not only the matter-antimatter asymmetry but also the asymmetric relic density of the Dirac gaugino dark matter. The dark matter mass turns out to be controlled by the Yukawa couplings of the heavy Higgs triplets, and it can be naturally at the weak scale for a mild hierarchy of the Yukawa couplings.
9 pages. Restructured for clear presentation, corrected some errors and typos. No change in conclusion
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