Search for one large extra dimension with the DELPHI detector at LEP2

TL;DR

This study uses DELPHI detector data from LEP2 to search for evidence of a single large extra dimension, setting limits on the fundamental mass scale based on photon detection and graviton emission predictions.

Contribution

It provides the first experimental limit on a single large extra dimension in a modified ADD scenario using LEP2 data.

Findings

No deviation from Standard Model predictions was observed.

A 95% CL lower limit of 1.69 TeV was set on the fundamental mass scale.

The expected limit was 1.71 TeV.

Abstract

Single photons detected by the DELPHI experiment at LEP2 in the years 1997-2000 are used to investigate the existence of a single extra dimension in a modifed ADD scenario with slightly warped large extra dimensions. The data collected at centre-of-mass energies between 180 and 209 GeV for an integrated luminosity of ~650 pb^-1 agree with the predictions of the Standard Model and allow a limit to be set on graviton emission in one large extra dimension. The limit obtained on the fundamental mass scale MD is 1.69 TeV at 95% CL, with an expected limit of 1.71 TeV.