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
N1 - Funding Information:
V.B. thanks the Aspen Center for Physics for hospitality and C.K. thanks Stan Brodsky, Michael Peskin, and the SLAC Theoretical Physics Group, where part of the research was completed, for their hospitality. This research was supported in part by the US Department of Energy under Grants No. DE-FG02-95ER40896, No. DE-FG02-04ER41305, No. DE-FG02-03ER46040, and No. DOE-EY-76-02-3071, and in part by the Wisconsin Alumni Research Foundation.
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 -