First Order Calculation of the Inclusive Cross Section pp to ZZ by Graviton Exchange in Large Extra Dimensions

TL;DR

This paper calculates the impact of large extra dimensions on ZZ-boson production at the LHC, showing potential deviations from the Standard Model that could reveal the structure of extra dimensions.

Contribution

It provides the first order perturbative calculation of graviton-mediated ZZ production in the ADD model at LHC energies.

Findings

At Tevatron energies, the contribution is negligible for mass scales above 2500 GeV.

At LHC energies, the ZZ production rate could significantly differ from the Standard Model if the fundamental scale is below 15000 GeV.

The results can help infer the number and structure of extra dimensions from experimental data.

Abstract

We calculate the inclusive cross section of double Z-boson production within large extra dimensions at the Large Hadron Collider (LHC). Using perturbatively quantized gravity in the ADD model we perform a first order calculation of the graviton mediated contribution to the pp to ZZ cross section. At low energies (e.g. Tevatron) this additional contribution is very small, making it virtually unobservable, for a fundamental mass scale above 2500 GeV. At LHC energies however, the calculation indicates that the ZZ-production rate within the ADD model should differ significantly from the Standard Model if the new fundamental mass scale would be below 15000 GeV. A comparison with the observed production rate at the LHC might therefore provide direct hints on the number and structure of the extra dimensions.