Abstract
Effects of Kaluza–Klein excited neutral vector bosons (Z′ bosons) in the gauge-Higgs unification on e+e−→q¯q,ℓ+ℓ− cross sections are studied, particularly in future e+e− collider experiments with polarized beams. Significant deviations in the energy and polarization dependence in σ(μ+μ−), the lepton forward–backward asymmetry, Rb(μ)≡σ(b¯b)/σ(μ+μ−) and the left–right asymmetry from the standard model are predicted.
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