Leptogenesis origin of Dirac gaugino dark matter

TL;DR

This paper proposes a leptogenesis mechanism within R-symmetric supersymmetry models that naturally produces Dirac gaugino dark matter with a mass linked to heavy Higgs triplet Yukawa couplings, connecting neutrino physics and dark matter.

Contribution

It introduces a novel leptogenesis scenario that simultaneously explains matter-antimatter asymmetry and Dirac gaugino dark matter relic density in R-symmetric SUSY models.

Findings

Leptogenesis from heavy triplet decay generates matter asymmetry.

Dirac gaugino dark matter mass is linked to Higgs triplet Yukawa couplings.

Dark matter mass can naturally be at the weak scale.

Abstract

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.