Asymptotic safety and Kaluza-Klein gravitons at the LHC

TL;DR

This paper investigates how asymptotic safety in quantum gravity with extra dimensions influences Kaluza-Klein graviton signals at the LHC, showing potential for detecting new physics beyond the Standard Model.

Contribution

It introduces a renormalization group approach to model the energy dependence of gravity in extra dimensions and predicts observable signals at the LHC.

Findings

Kaluza-Klein graviton signals are above Standard Model backgrounds

Significant sensitivity to the crossover energy scale Lambda_T

Energy dependence of Newton's coupling regularizes gravitational amplitudes

Abstract

We study Drell-Yan production at the LHC in low-scale quantum gravity models with extra dimensions. Asymptotic safety implies that the ultra-violet behavior of gravity is dictated by a fixed point. We show how the energy dependence of Newton's coupling regularizes the gravitational amplitude using a renormalization group improvement. We study LHC predictions and find that Kaluza-Klein graviton signals are well above Standard Model backgrounds. This leaves a significant sensitivity to the energy scale Lambda_T where the gravitational couplings cross over from classical to fixed point scaling.