Constraints on gauge-Higgs unification models at the LHC

TL;DR

This paper investigates the potential to detect Kaluza-Klein gluons predicted by gauge-Higgs unification models at the 14 TeV LHC, analyzing resonance signals in dijet mass distributions.

Contribution

It provides a detailed analysis of Kaluza-Klein gluon signals in a specific gauge-Higgs unification model and discusses their detectability at the LHC.

Findings

Resonance contributions of Kaluza-Klein gluons can be observed in dijet distributions.

Signal-to-noise ratios depend on Kaluza-Klein gluon masses and kinematic cuts.

Constraints on gauge-Higgs unification models can be derived from LHC data.

Abstract

We examine the possibility of observing the Kaluza-Klein gluons in gauge-Higgs unification models at the LHC with the energy sqrt{s}=14 TeV. We consider a benchmark model with the gauge symmetry SU(3)_C x SU(3)_W in five-dimensional space-time, where SU(3)_C is the gauge symmetry of the strong interaction and SU(3)_W is that for the electroweak interaction and a Higgs doublet field. It is natural in general to introduce SU(3)_C gauge symmetry in five-dimensional space-time as well as SU(3)_W gauge symmetry in gauge-Higgs unification models. Since the fifth dimension is compactified to S1/Z2 orbifold, there are Kaluza-Klein modes of gluons in low-energy effective theory in four-dimensional space-time. We investigate the resonance contribution of the first Kaluza-Klein gluon to dijet invariant mass distribution at the LHC, and provide signal-to-noise ratios in various cases of Kaluza-Klein gluon masses and kinematical cuts. Although the results are given in a specific benchmark model, we discuss their application to general gauge-Higgs unification models with Kaluza-Klein gluons. Gauge-Higgs unification models can be verified or constrained through the physics of the strong interaction, though they are proposed to solve the naturalness problem in electroweak symmetry breaking.