Probing the light radion through diphotons at the Large Hadron Collider

TL;DR

This paper explores the potential to detect a light radion particle in the 60-110 GeV range at the LHC using diphoton decay channels, considering background suppression and high luminosity.

Contribution

It demonstrates that the LHC can discover a light radion in the specified mass range with high significance using diphoton signals and optimized background suppression techniques.

Findings

Detection of radion possible with 3000 fb^{-1} luminosity

Radion can be identified with 5 sigma significance

Diphoton channel effective for radion discovery

Abstract

A radion in a scenario with a warped extra dimension can be lighter than the Higgs boson, even if the Kaluza-Klein excitation modes of the graviton turn out to be in the multi-TeV region. The discovery of such a light radion would be gateway to new physics. We show how the two-photon mode of decay can enable us to probe a radion in the mass range 60 - 110 GeV. We take into account the diphoton background, including fragmentation effects, and include cuts designed to suppress the background to the maximum possible extent. Our conclusion is that, with an integrated luminosity of 3000 $\rm fb^{-1}$ or less, the next run of the Large Hadron Collider should be able to detect a radion in this mass range, with a significance of 5 standard deviations or more.