Neutralino relic density in a supersymmetric U(1)′ model

Vernon Barger, Chung Kao, Paul Langacker, Hye Sung Lee

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

We study properties of the lightest neutralino (χ 0) 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 χ0≲100 GeV in the limit that the U(1)′ gaugino mass is large compared to the electroweak scale. We find that the Zχ 0χ 0 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.

Original languageEnglish (US)
Pages (from-to)104-115
Number of pages12
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume600
Issue number1-2
DOIs
StatePublished - Oct 21 2004

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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