Direct Signals of Low Scale Gravity at $e^+ e^-$ Colliders

TL;DR

This paper investigates how low-scale gravity effects, predicted by extra-dimensional theories, could be detected at electron-positron colliders through graviton production with Z bosons or photons, and sets current experimental limits.

Contribution

It provides a detailed analysis of graviton production signals at $e^+ e^-$ colliders and derives sensitivity bounds on the cutoff scale from existing LEPII data.

Findings

Sensitivity estimates for graviton production at future colliders.

Current LEPII data constrains the cutoff scale of extra-dimensional gravity.

Predictions for collider signatures of low-scale gravity.

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 associated production of the gravitons with a $Z$ boson or a photon at $e^+ e^-$ colliders of energies of LEPII to the Next Linear Colliders (NLC) ($\sqrt{s}=0.25-1.5$ TeV) and calculate the sensitivity to the new interactions. We also obtain the limit on the cut-off scale using the present data from LEPII.