Global Lepton-Quark Neutral Current Constraint on Low Scale Gravity Model

TL;DR

This paper conducts a comprehensive analysis of lepton-quark neutral current data to constrain low scale gravity models with extra dimensions, setting lower bounds on the effective Planck scale.

Contribution

It provides the first global constraint on low scale gravity models from multiple collider experiments, incorporating data from HERA, Tevatron, and LEPII.

Findings

Effective Planck scale > 1.12 TeV for n=3

Effective Planck scale > 0.94 TeV for n=4

Drell-yan data gives the strongest constraint

Abstract

We perform a global analysis of the lepton-quark neutral current data on the low scale gravity model, which arises from the extra dimensions. The global data include HERA neutral current deep-inelastic scattering, Drell-yan production at the Tevatron, and fermion pair production at LEPII. The Drell-yan production, due to the large invariant mass data, provides the strongest constraint. Combining all data, the effective Planck scale must be larger than about 1.12 TeV for $n=3$ and 0.94 TeV for $n=4$ at 95%CL.