H to Z gamma in Gauge-Higgs Unification

Abstract

In our previous paper, we have investigated effects of a simple gauge-Higgs unification model on the diphoton signal events from the Higgs boson production at the Large Hadron Collider. We have found that in this model the effective Higgs-to-diphoton coupling can be enhanced by 1-loop corrections with Kaluza-Klein (KK) modes of bulk fields. This result can be an explanation for the observed excess of the signal strength in the Higgs to diphoton decay channel. In this paper, we investigate KK-mode effects on another Higgs boson decay mode, H to Z gamma. One naturally expects that the KK modes also contribute to the effective H-Z-gamma coupling and can cause some deviation for the H to Z gamma decay mode from the Standard Model prediction. Revealing a correlation between the KK-mode effects on the Higgs-to-diphoton and H-Z-gamma couplings is an interesting topic in terms of a possibility to discriminate a variety of models for physics beyond the Standard Model. We show a very striking result for the gauge-Higgs unification model, namely, the absence of KK-mode contributions to the H-Z-gamma coupling at the 1-loop level. This is a very specific and general prediction of the gauge-Higgs unification scenario.

10 pages, a final version accepted for publication in PRD

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• Precision Higgs Measurements: Constraints from New Oblique Corrections
• Higgs boson decay $h\to Z\gamma$ and muon magnetic dipole moment in the $\mu \nu$SSM
• Vector bileptons and the decays $h\to \gamma \gamma ,Z\gamma$
• Revisiting Electroweak Symmetry Breaking and Higgs Mass in Gauge-Higgs Unification
• $H\to Z\gamma$ in the gauge-Higgs unification
• Dark matter in the $SO(5)\times U(1)$ gauge-Higgs unification
• Higgs Decays in Gauge Extensions of the Standard Model
• Strong First Order Electroweak Phase Transition in Gauge-Higgs Unification at Finite Temperature
• Few remarks on the Higgs boson decays in gauge-Higgs unification
• Diphoton and Z photon Decays of Higgs Boson in Gauge-Higgs Unification: A Snowmass white paper