TY - JOUR
T1 - Neutralino relic density in a supersymmetric U(1)′ model
AU - Barger, Vernon
AU - Kao, Chung
AU - Langacker, Paul
AU - Lee, Hye Sung
PY - 2004/10/21
Y1 - 2004/10/21
N2 - 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.
AB - 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.
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U2 - 10.1016/j.physletb.2004.08.070
DO - 10.1016/j.physletb.2004.08.070
M3 - Article
AN - SCOPUS:4644235736
VL - 600
SP - 104
EP - 115
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
SN - 0370-2693
IS - 1-2
ER -