Higgs-Gluon Coupling in Warped Extra Dimensional Models with Brane Kinetic Terms

TL;DR

This paper investigates how warped extra-dimensional models with brane kinetic terms affect the Higgs-gluon coupling, showing that current measurements can constrain the Kaluza-Klein scale to about 1.2 TeV.

Contribution

It demonstrates a partial cancellation in fermionic KK tower contributions and links Higgs-gluon coupling deviations to KK mode mixing effects.

Findings

Partial cancellation in fermionic KK contributions to Higgs-gluon coupling.

Current Higgs coupling measurements constrain KK scale to approximately 1.2 TeV.

Coupling dependence primarily from mixing between SM states and KK excitations.

Abstract

Warped models with the Higgs confined to the weak brane and the gauge and matter fields accessing the $AdS_5$ bulk provide viable setting to address the gauge hierarchy problem. Brane kinetic terms for the bulk fields are known to ease some of the tensions of these models with precision electroweak observables and flavor constraints. We study the loop-driven Higgs coupling to the gluons that are relevant to the Higgs program at LHC, in this scenario. We demonstrate a partial cancellation in the contribution of the fermionic Kaluza-Klein (KK) towers within such framework relatively independent of the 5D parameters. The entire dependence of this coupling on the new physics arises from the mixing between the Standard Model states and the KK excitations. We find that the present precision in measurement of these couplings can lead to a constraint on the KK scale up to 1.2 TeV at $95\%$ confidence level.