Extra-dimensional gravity and dijet production at gamma gamma colliders

TL;DR

This paper investigates how dijet production at gamma gamma colliders can be used to detect large extra-dimensional gravity effects by analyzing deviations in cross sections caused by virtual graviton exchanges, revealing potential to probe scales up to 11.1 TeV.

Contribution

It demonstrates the potential of gamma gamma colliders to probe large extra-dimensional gravity models through dijet production and identifies optimal p_T cuts for maximum sensitivity.

Findings

Effective mass scale can be probed from 2.7 TeV to 11.1 TeV.

Severe p_T cuts (~46% of beam energy) maximize detection reach.

Virtual graviton exchange significantly alters Standard Model cross sections.

Abstract

In this note, we consider dijet production at gamma gamma colliders as a probe of recently proposed, large extra-dimensional gravity models. The exchange of virtual, spin-2 graviton towers (Kaluza-Klein excitations) significantly modifies the cross section, as compared to the Standard Model predictions. We find that, in order to maximize the value of the effective scale that can be probed at a given center-of-mass energy, a very severe p_T cut should be applied; in general, a p_T equal to approximately 46% of the e^+ e^- beam energy gives the highest reach. We find that we can probe the effective mass scale from about 2.7 TeV to 11.1 TeV, depending on the center-of-mass energy and assumptions about the model.