Neutralino Relic Density in a Supersymmetric U(1)' Model

Details Neutralino Relic Density in a Supersymmetric U(1)' Model Neutralino Relic Density in a Supersymmetric U(1)' Model

2004-08-10

arxiv.org/abs/hep-ph/0408120v2

Phys.Lett.B600:104-115,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

Version to be published in Physics Letters B. 13 pages, Revtex4, epsf.sty, 13 postscript figures

Scientific paper

10.1016/j.physletb.2004.08.070

We study properties of the lightest neutralino (\chi) and calculate its cosmological relic density in a supersymmetric U(1)' model with a secluded U(1)' breaking sector (the S-model). The lightest neutralino mass is smaller than in the minimal supersymmetric standard model; for instance, m_\chi < 100 GeV in the limit that the U(1)' gaugino mass is large compared to the electroweak scale. We find that the Z-\chi-\chi coupling can be enhanced due to the singlino components in the extended neutralino sector. Neutralino annihilation through the Z-resonance then reproduces the measured cold dark matter density over broad regions of the model parameter space.

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