Probing warped extra dimension via gg -> h and h -> gamma gamma at LHC

TL;DR

This paper investigates how warped extra dimensions influence Higgs production and decay at the LHC, revealing significant modifications in gg -> h and h -> gamma gamma processes due to Kaluza-Klein states.

Contribution

It demonstrates that Kaluza-Klein fermion states in warped extra dimensions can notably alter Higgs processes at the LHC, providing comparative analysis with other models.

Findings

KK states can have order-one Yukawa couplings with the Higgs.

gg -> h and h -> gamma gamma rates are significantly affected by KK states within LHC reach.

Quantitative differences between RS and UED scenarios are highlighted.

Abstract

The processes gg -> h and h -> gamma gamma are of paramount importance in the context of Higgs search at the LHC. These processes are loop driven and hence could be sensitive to the presence of any new colored fermion states having a large coupling with the Higgs. Such a scenario arises in a warped extra dimensional theory, where the Higgs is confined to the TeV brane and the hierarchy of fermion masses is addressed by localizing them at different positions in the bulk. We show that the Yukawa coupling of the Higgs with the fermion Kaluza-Klein (KK) states can be order one irrespective of their zero mode masses. We observe that the gg -> h and h -> gamma gamma rates are substantially altered if the KK states lie within the reach of LHC. We provide both intuitive and numerical comparison between the RS and UED scenarios as regards their quantitative impact in such processes.