Diphoton Decay Excess and 125 GeV Higgs Boson in Gauge-Higgs Unification
Nobuhito Maru, Nobuchika Okada
TL;DR
This paper explores how a gauge-Higgs unification model in five dimensions can explain the enhanced diphoton decay rate of the Higgs boson observed at the LHC, while also accounting for its mass.
Contribution
It introduces a simple gauge-Higgs unification model with color-singlet bulk fermions and half-periodic boundary conditions to explain Higgs decay signals and mass.
Findings
Explains the enhanced diphoton decay signal at LHC.
Reproduces the observed 125 GeV Higgs mass.
Highlights the role of bulk fermions in the model.
Abstract
In the context of gauge-Higgs unification scenario in a 5-dimensional flat spacetime, we investigate Higgs boson production via gluon fusion and its diphoton decay mode at the LHC. We show that the signal strength of the Higgs diphoton decay mode observed at ATLAS and CMS, which is considerably larger than the Standard Model expectation, can be explained by a simple gauge-Higgs unification model with color-singlet bulk fermions to which a half-periodic boundary condition is assigned. The bulk fermions also play a crucial role in reproducing the observed Higgs boson mass around 125 GeV.
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