Bounds on Warped Extra Dimensions from a Standard Model-like Higgs Boson

TL;DR

The paper discusses how measurements of Higgs boson decay channels at the LHC can constrain parameters of warped extra-dimensional models, especially regarding Kaluza-Klein particles, even beyond direct detection capabilities.

Contribution

It demonstrates that Higgs decay measurements can indirectly probe Kaluza-Klein masses up to 10 TeV in warped extra-dimension models.

Findings

Higgs decay channels are sensitive to Kaluza-Klein effects.

Loop effects reduce Higgs production via gluon fusion.

Decay ratio Br(h->γγ)/Br(h->ZZ) is enhanced.

Abstract

We point out that the discovery of a light Higgs boson in the \gamma\gamma, ZZ and WW decay channels at the LHC, with cross sections not far from the predictions of the Standard Model, would have important implications for the parameters of warped extra-dimension models. Due to loop effects of Kaluza-Klein particles, these models predict a significant reduction of the Higgs production cross section via gluon-gluon fusion, combined with an enhancement of the ratio Br(h->\gamma\gamma)/Br(h->ZZ). LHC measurements of these decays will probe Kaluza-Klein masses up to the 10 TeV range, exceeding by far the reach for direct production.