Global Analysis of Bhabha Scattering at LEP2 and Limits on Low Scale Gravity Models

TL;DR

This paper combines data from four LEP experiments to search for signs of low scale gravity via Bhabha scattering, setting new lower limits on the model parameters with no significant deviations found.

Contribution

It provides the first comprehensive global analysis of Bhabha scattering data from LEP to constrain low scale gravity models with large extra dimensions.

Findings

No significant deviations from the Standard Model observed.

Lower limits on the gravity scale are set at 1.077 TeV and 1.412 TeV for different model parameters.

The analysis improves constraints on theories with large extra dimensions.

Abstract

A global analysis of the data on Bhabha scattering from the four LEP experiments ALEPH, DELPHI, L3 and OPAL is performed to search for effects of virtual graviton exchange in models with low scale gravity. No statistically significant deviations from the Standard Model expectations are observed and lower limits on the scale of models with large extra dimensions of $\Lambda_T = 1.077 TeV$ for $\lambda = -1$ and $\Lambda_T = 1.412 TeV$ for $\lambda = +1$ at 95% confidence level are derived.