Supersymmetric Higgs-portal and X-ray lines

Abstract

We consider a Dirac singlet fermion as thermal dark matter for explaining the X-ray line in the context of a supersymmetric Higgs-portal model or a generalized Dirac NMSSM. The Dirac singlet fermion gets a mass splitting due to their Yukawa couplings to two Higgs doublets and their superpartners, Higgsinos, after electroweak symmetry breaking. We show that a correct relic density can be obtained from thermal freeze-out, due to the co-annihilation with Higgsinos for the same Yukawa couplings. We discuss the phenomenology of the Higgsinos in this model such as displaced vertices at the LHC.

arXiv comment15 pages, 4 figures, references added

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• Return of the X-rays: A New Hope for Fermionic Dark Matter at the keV Scale
• Exothermic Dark Matter for XENON1T Excess
• A Couplet from Flavored Dark Matter
• Common Origin of 3.55 keV X-Ray Line and Galactic Center Gamma Ray Excess in a Radiative Neutrino Mass Model
• Common Origin of $3.55$ keV X-ray line and Gauge Coupling Unification with Left-Right Dark Matter