Neutralino relic density in a supersymmetric <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mi>U</mml:mi><mml:msup><mml:mrow><mml:mo>(</mml:mo><mml:mn>1</mml:mn><mml:mo>)</mml:mo></mml:mrow><mml:mo>′</mml:mo></mml:msup></mml:math> model

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

doi:10.1016/j.physletb.2004.08.070

Cited by 41 publications

(13 citation statements)

References 57 publications

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“…Inclusion of the kinetic mixing in the Stueckelberg extension enhances significantly the parameter space where new physics can exist consistent with the stringent LEP, Tevatron, and WMAP constraints. This parameter space includes the possibility of a narrow Z 0 resonance very distinct from the Z 0 of the conventional models [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

StueckelbergZ′extension with kinetic mixing and millicharged dark matter from the hidden sector

2007

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An analysis is given of the Stueckelberg extension of the standard model with a hidden sector gauge group U1 X where the mass growth for the extra gauge boson occurs via the Stueckelberg mechanism, and where the kinetic mixing in the U1 X U1 Y sector is included. Such a kinetic mixing is generic in a broad class of supergravity and string models. We carry out a detailed global fit of the model with the precision CERN LEP data on and off the Z pole, with 2 within 1% of the 2 of the standard model fit. Further, it is shown that, in the absence of matter in the hidden sector, there is a single effective parameter that controls the deviations from the standard model predictions, and the dependence on the kinetic mixing emerges only when matter in the hidden sector is included. An analysis is also given of millicharged dark matter arising from the hidden sector, where it is shown that such dark matter from the Stueckelberg extension can satisfy WMAP-3 data while allowing for a sharp Z 0 resonance which can be detected at the Tevatron and at the CERN LHC via a dilepton signal generated by the Drell-Yan process.

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Section: Introductionmentioning

confidence: 99%

StueckelbergZ′extension with kinetic mixing and millicharged dark matter from the hidden sector

2007

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“…In the nMSSM (also in the S-model in the decoupling limit), because of the small χ 0 1 mass, the Z pole is the dominant channel [11,14]. To obtain an acceptable relic density with only the Z pole annihilation contribution, the lower M χ 0 1 bound is M χ 0 1 ∼ > 30 GeV which is allowed for only small tan β , while the solution for a 2.4σ deviation from the SM of (g − 2) µ favors large tan β , which allows only small M χ 0 1 .…”

Section: Discussionmentioning

confidence: 99%

Properties of the Lightest Neutralino in MSSM Extensions

Barger¹

2005

AIP Conference Proceedings

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Abstract. We study neutralino sectors in extensions of the MSSM that dynamically generate the µ-term. The extra neutralino states are superpartners of the Higgs singlets and/or additional gauge bosons. The extended models may have distinct lightest neutralino properties which can have important influences on their phenomenology. We consider constraints on the lightest neutralino from LEP, Tevatron, and (g − 2) µ measurements and the relic density of the dark matter. The lightest neutralino can be extremely light and/or dominated by its singlino component, which does not couple directly to SM particles except Higgs doublets.

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“…It is then possible to satisfy the relic density constraints consistent with WMAP data [41,46]. For other possible candidates arising from U (1) extensions see [47,48].…”

Section: Milli Weak Dark Mattermentioning

confidence: 97%

Predicted Signatures at the LHC from U(1) Extensions of the Standard Model

Nath¹

2011

Predicted and Totally Unexpected in the Energy Frontier Opened by LHC

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We discuss the U (1) X extensions of the standard model with focus on the Stueckelberg mechanism for mass growth for the extra U (1) X gauge boson. The assumption of an axionic connector field which carries dual U (1) quantum numbers, i.e., quantum numbers for the hypercharge U (1) Y and for the hidden sector gauge group U (1) X , allows a non-trivial mixing between the mass growth for the neutral gauge vector bosons in the SU (2) L × U (1) Y sector and the mass growth for the vector boson by the Stueckelberg mechanism in the U (1) X sector. This results in an extra Z ′ which can be very narrow, but still detectable at the Large Hadron Collider (LHC). The U (1) X extension of the minimal supersymmetric standard model is also considered and the role of the Fayet-Illiopoulos term in such an extension discussed. The U (1) X extensions of the SM and of the MSSM lead to new candidates for dark matter.

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

Cited by 41 publications

References 57 publications

StueckelbergZ′extension with kinetic mixing and millicharged dark matter from the hidden sector

StueckelbergZ′extension with kinetic mixing and millicharged dark matter from the hidden sector

Properties of the Lightest Neutralino in MSSM Extensions

Predicted Signatures at the LHC from U(1) Extensions of the Standard Model

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