Extra dimensions in gamma gamma -> gamma gamma process at the CERN-LHC
S. Atag, S. C. Inan, I. Sahin
TL;DR
This paper assesses the LHC's capability to probe extra-dimensional scenarios (ADD and RS) via exclusive photon-photon collisions, incorporating the Standard Model one-loop $\gamma\gamma \to \gamma\gamma$ background. It computes the effective $\gamma\gamma$ luminosity for forward-detector acceptances and analyzes KK graviton exchange contributions to $pp \to p\gamma\gamma p$, deriving 95% C.L. bounds on the ADD scale $M_D$ and on RS parameters $\Lambda_{\pi}$ and $\beta$ as a function of integrated luminosity. The results indicate that the $\gamma\gamma$ final state in forward-tagged events offers stronger constraints than LEP/Tevatron and remains a clean channel, though quark- and gluon-initiated backgrounds warrant additional study. The analysis highlights the favorable impact of the $0.1<ξ<0.5$ region and demonstrates the potential of forward detectors to extend the reach for TeV-scale new physics at the LHC.
Abstract
Potential of the LHC to explore the phenomenology of the Kaluza-Klein (KK) tower of gravitons in the scenarios of the Arkani-Hamed, Dimopoulos and Dvali(ADD) model and Randall-Sundrum (RS) model is discussed via the process ${γγ\to γγ}$ including the Standard Model one loop diagram. The improved constraints on model parameters have been obtained compared to the LEP and Tevatron sensitivity.