Diphoton signals for Low Scale Gravity in Extra Dimensions

TL;DR

This paper investigates how low scale gravity in extra dimensions could enhance diphoton production in various collider experiments, providing potential signals for new physics beyond the Standard Model.

Contribution

It introduces a study of diphoton signals as a probe for low scale gravity in extra dimensions, including deriving limits and sensitivity estimates from collider data.

Findings

Derived limits on the cut-off scale from existing diphoton data.

Estimated sensitivity reach for future collider runs.

Highlighted the significance of tree-level photon couplings in detecting new gravity interactions.

Abstract

Gravity can become strong at the TeV scale in the theory of extra dimensions. An effective Lagrangian can be used to describe the gravitational interactions below a cut-off scale. In this work, we study the diphoton production in $\gamma\gamma$, $p\bar p$, and $e^+ e^-$ collisions in the model of low scale gravity. Since in the standard model photon-photon scattering only occurs via box diagrams, the cross section is highly suppressed. Thus, photon-photon scattering opens an interesting opportunity for studying the new gravity interaction, which allows tree-level photon couplings. In addition, we also examine the diphoton production at hadronic and $e^+ e^-$ colliders. We derive the limits on the cut-off scale from the available diphoton data and also estimate the sensitivity reach in Run II at the Tevaton and at the future linear $e^+ e^-$ colliders.