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Leptogenesis origin of Dirac gaugino dark matter · Around

2010

Leptogenesis origin of Dirac gaugino dark matter

Chun, Eung Jin

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The Dirac nature of the gauginos (and also the Higgsinos) can be realized in $R$-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.

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For a review, see, S. Davidson, E. Nardi and Y. Nir, Phys. Rept. 466

2008

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For a review, see, K. Benakli and C. Moura in M. M. Nojiri et al

Cited in the paper.

Note, however, that the leptogenesis in the type I seesaw introducing right-handed neutrinos cannot generate a non-vanishing Dirac gaugino dark matter asymmetry as the DM number is also conserved in the right-handed neutrino/sneutrino decay

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