# Distinct signals of the gauge-Higgs unification in $e^+e^-$ collider experiments

## TL;DR

This paper predicts distinctive signals of gauge-Higgs unification models in future electron-positron collider experiments, focusing on deviations in cross sections and asymmetries caused by Kaluza-Klein $Z'$ bosons.

## Contribution

It demonstrates how Kaluza-Klein excitations in gauge-Higgs unification lead to observable deviations in collider cross sections and asymmetries, providing potential experimental signatures.

## Key findings

- Significant deviations in muon pair production cross sections.
- Altered forward-backward asymmetry in leptons.
- Changes in $R_b$ ratio and left-right asymmetry from SM predictions.

## Abstract

Effects of Kaluza-Klein excited neutral vector bosons ($Z'$ bosons) in the gauge-Higgs unification on $e^+e^- \to \bar{q}q, \ell^+\ell^-$ cross sections are studied, particularly in future $e^+ e^-$ collider experiments with polarized beams. Significant deviations in the energy and polarization dependence in $\sigma(\mu^+\mu^-)$, the lepton forward-backward asymmetry, $R_b(\mu) \equiv \sigma(\bar{b}b)/\sigma(\mu^+\mu^-)$ and the left-right asymmetry from the standard model are predicted.