Direct collider signatures of large extra dimensions

The realization of low (TeV) scale strings usually requires the existence o f large (TeV) extra dimensions where gauge bosons live. The direct producti on of Kaluza-Klein excitations of the photon and Z-boson at present and fut ure colliders is studied in this work. At the LEPII, NLC and Tevatron colli ders, these Kaluza-Klein modes lead to deviations from the standard model c ross-sections, which provide lower bounds on their mass. At the LHC the cor responding resonances can be produced and decay on-shell, triggering a char acteristic pattern in the distribution of dilepton invariant mass. (C) 1999 Published by Elsevier Science B.V. All rights reserved.