Oblique parameter constraints on large extra dimensions

We consider the Kaluza-Klein scenario in which gravity propagates in the (4+n)-dimensional bulk of spacetime and the standard model particles are confined to a 3-brane. We calculate the gauge boson self-energy corrections arising from the exchange of virtual gravitons and present our results in the STU formalism. We find that the new physics contributions to S, T and U decouple in the limit that the string scale M{sub S} goes to infinity. The oblique parameters constrain the lower limit on M{sub S}. Taking the quantum gravity cutoff to be M{sub S}, S-parameter constraints impose M{sub S}>1.55 TeV for n=2 at the 1{sigma} level. T-parameter constraints impose M{sub S}>1.25 (0.75) TeV for n=3 (6).