Direct photon pair production at the LHC to order alpha_s in TeV scale gravity models

TL;DR

This paper presents next-to-leading order QCD corrections to direct photon pair production at the LHC within large extra dimension models, highlighting significant impacts on observables and reduced theoretical uncertainties.

Contribution

It provides the first NLO QCD calculations for photon pair production in large extra dimension models, including all subprocesses and experimental cuts.

Findings

QCD corrections significantly affect kinematic distributions

Inclusion of alpha_s reduces factorization scale uncertainty

Results are relevant for LHC physics studies

Abstract

The first results on next-to-leading order QCD corrections to production of direct photon pairs in hadronic collisions in the large extra dimension models- ADD and RS are presented. Various kinematical distributions are obtained to order alpha_s in QCD by taking into account all the parton level subprocesses. Our Monte Carlo based code incorporates all the experimental cuts suitable for physics studies at the LHC. We estimate the impact of the QCD corrections on various observables and find that they are significant. We also show the reduction in factorisation scale uncertainity when order alpha_s effects are included.