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

TL;DR

This study reanalyzed DELPHI detector data from LEP2 to search for evidence of a single large extra dimension, setting new limits on the fundamental mass scale in a warped ADD scenario.

Contribution

It provides the first experimental limit on graviton emission in a single large extra dimension within a warped ADD framework using LEP data.

Findings

No deviation from Standard Model predictions was observed.

A 95% CL lower limit of 1.69 TeV/c^2 was set on the fundamental mass scale M_D.

The expected limit was 1.71 TeV/c^2.

Abstract

Single photons detected by the DELPHI experiment at LEP2 in the years 1997-2000 are reanalysed to investigate the existence of a single extra dimension in a modified 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 M_D is 1.69 TeV/c^2 at 95% CL, with an expected limit of 1.71 TeV/c^2.