Figure 8
Fig. 8. If there is an extra dimension of the size 10-18 m felt by the electroweak interactions, then the LHC should produce the first Kaluza-Klein states of the photon and the Z boson. We can then detect the electron-positron pairs produced by the disintegration of these states. The number of expected events is computed as a function of the energy of the pair in GeV, with from highest to lowest, excitation of photon+Z, photon and Z boson.