# Revisiting the Real Graviton Effects at CERN LHC within the Quantum Gravity Theory with Large Extra Dimensions - High Energy Physics - Phenomenology

Abstract: CERN LHC provides a good experimental platform to perturbatively probe thefundamental gravity scale up to several TeV, with the precise value dependingon the number of extra dimensions. The leading experimental signal of gravitonat LHC is from the process $pp\to jet+{E\slash} T$, where ${E\slash} T$ standsfor the transverse missing energy. A detailed discussion on the hadronicproduction of real graviton through hard subprocesses: $q\bar{q}\to G+g$,$g+q\to G+q$ and $g+g\to G+g$ have been studied within the quantum gravitytheory with large extra dimensions. The main theoretical uncertainties togetherwith the dominant standard model background to these processes, e.g.$q\bar{q}\to Z^0+g$ and $g+q\to Z^0+q$ with $Z^0$ further decaying intoneutrinos, have also been discussed. It is found that only in certain jetenergy region and with certain number of extra dimensions can the quantumgravity signal be distinguished from the background, which inversely lead tothe effective scale $M D$ to be probed up to $8.8\pm 0.9$ TeV for two extradimensions, and $5.9\pm 0.5$ TeV for four extra dimensions with sufficientintegrated luminosity, e.g. $100fb^{-1}$, at CERN LHC.

Author: Xing-Gang Wu, Zhen-Yun Fang

Source: https://arxiv.org/