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

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

doi:10.1016/j.physletb.2004.08.070

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

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

Physics

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41 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 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	https://doi.org/10.1016/j.physletb.2004.08.070
State	Published - Oct 21 2004

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1016/j.physletb.2004.08.070

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title = "Neutralino relic density in a supersymmetric U(1)′ model",

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.",

author = "Vernon Barger and Chung Kao and Paul Langacker and Lee, {Hye Sung}",

note = "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.",

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doi = "10.1016/j.physletb.2004.08.070",

language = "English (US)",

volume = "600",

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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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JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-2

ER -

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

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