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 language | English (US) |
|---|---|
| Pages (from-to) | 104-115 |
| Number of pages | 12 |
| Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
| Volume | 600 |
| Issue number | 1-2 |
| DOIs | |
| State | Published - Oct 21 2004 |
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
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Barger, V., Kao, C., Langacker, P., & Lee, H. S. (2004). Neutralino relic density in a supersymmetric U(1)′ model. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 600(1-2), 104-115. https://doi.org/10.1016/j.physletb.2004.08.070