Neutralino Relic Density in a Supersymmetric U(1)' Model
Abstract
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.
Keywords
Cite
@article{arxiv.hep-ph/0408120,
title = {Neutralino Relic Density in a Supersymmetric U(1)' Model},
author = {Vernon Barger and Chung Kao and Paul Langacker and Hye-Sung Lee},
journal= {arXiv preprint arXiv:hep-ph/0408120},
year = {2009}
}
Comments
Version to be published in Physics Letters B. 13 pages, Revtex4, epsf.sty, 13 postscript figures