Combination of LEP Results on Direct Searches for Large Extra Dimensions

Direct searches for Kaluza-Klein graviton emission in e+e- collisions were performed by the four LEP experiments in events with a single photon and missing energy. This note presents a combination of published results from ALEPH, DELPHI and L3 obtained using a total of 1.9 fb-1 of data collected at centre-of-mass energies between 183 GeV and 209 GeV. No excess is observed beyond the Standard Model expectation, and lower limits between 1.6 TeV and 0.66 TeV are set, at 95% confidence level, on the fundamental scale of gravity for the number of extra dimensions between 2 and 6.