Unique Graviton Exchange Signatures at Linear Colliders

Abstract

Many types of new physics can lead to contact interaction-like modifications in $e^+e^-$ processes below direct production threshold. We examine the possibility of uniquely identifying the effects of graviton exchange from amongst this large set of models by using the moments of the angular distribution of the final state particles. In the case of $e^+e^-\to f\bar f(W^+W^-)$ we demonstrate that this technique allows for the unique identification of the graviton exchange signature at the $5σ$ level for mass scales as high as $6(2.5)\sqrt s$.