Signature of Large Extra Dimensions from Z boson pair production at the CERN Large Hadron Collider

TL;DR

This paper investigates how large extra dimensions could enhance Z boson pair production at the LHC, providing potential signals to detect extra dimensions up to several TeV in scale.

Contribution

It presents a self-consistent analysis of LED effects on Z boson pair production, including constraints from partial wave unitarity and distinctive kinematic distributions.

Findings

LED can significantly increase Z pair production cross sections

LHC can probe LED scales up to 4.3-5.6 TeV at 3σ

Distinct kinematic features differentiate LED signals from SM

Abstract

We study the Z boson pair production mediated by the Kaluza-Klein (KK) graviton in large extra dimensions (LED) at the CERN Large Hadron Collider (LHC). We use the partial wave unitarity to discuss the constraints on the process energy scale in order to give a self-consistent calculation. We find that the LED contributions can enhance the Z boson pair production cross sections significantly when the fundamental scale $M_S$ of the large extra dimensions is up to several TeV. We also show that the kinematic distributions of the LED signals are greatly different from the standard model ones and the LHC can probe the $M_S$ values up to $4.3\sim 5.6$ TeV at $3\sigma$ level depending on the number of the extra dimensions.