Looking for Z' bosons in Supersymmetric E_6 Models through Electroweak Precision Data

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dc.creatorCho, Gi-Chol
dc.date2000-02-11
dc.date.accessioned2026-07-07T10:32:36Z
dc.date.available2026-07-07T10:32:36Z
dc.descriptionWe review constraints on additional Z' bosons predicted in supersymmetric (SUSY) E_6 models from electroweak experiments - Z-pole experiments, mW measurements and the low-energy neutral current (LENC) experiments. Four representative models - χ,ψ, η, νmodels - are studied in some detail. We find that the improved data of parity violation in cesium atom, which is 2.2-σaway from the Standard Model (SM) prediction, could be explained by the exchange of the heavy mass eigenstate Z_2 in the intermediate state. The improvement over the SM can be found in χ, η, νmodels, where the total χ^2 of the fit to the 26 data points decreases by about five units, owing to the better fit to the atomic parity violation. Impacts of the kinetic mixing between the U(1)_Y and U(1)' gauge bosons on the χ^2-analysis are studied. We find that the Z' model with (β_E, δ)=(-π/4,0.2), where β_E is the mixing angle between Z_χand Z_ψbosons and δdenotes the kinetic mixing, shows the most excellent fit to the data: the total χ^2 decreases by about seven units as compared to the SM. We introduce the effective mixing parameter ζ, a combination of the mass and the kinetic mixing parameters. The 95% CL lower mass bound of Z_2 can be shown as a function of ζ. A theoretical prediction on ζand the U(1)'gauge coupling g_E is studied for the χ,ψ,ηand νmodels by assuming the minimal particle content of the SUSY E_6 models.
dc.description20 pages, 3 figures. submitted to the Brief Review section of Mod.Phys.Lett.A
dc.identifierhttps://arxiv.org/abs/hep-ph/0002128
dc.identifierhttp://arxiv.org/abs/hep-ph/0002128
dc.identifierMod.Phys.Lett.A15:311-332,2000
dc.identifierdoi:10.1016/S0217-7323(00)00030-X
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178810
dc.subjectHigh Energy Physics - Phenomenology
dc.titleLooking for Z' bosons in Supersymmetric E_6 Models through Electroweak Precision Data
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