Effects of standard model Kaluza-Klein excitations on electroweak observables - art. no. 096005

The presence of an extra dimension of size R approximate to TeV-1 introduce s a tower of Kaluza-Klein gauge boson excitations that affects the standard model relations between electroweak observables. The mixing BE the W and Z bosons with their excitations changes their masses and couplings to fermio ns. This effect depends on the Higgs field, which may live in the bulk of t he extra dimension, on its boundary, or may be a combination of both types of fields. We use high-precision electroweak data to constrain 1/R. We find limits from 1 to 3 TeV from different observables, with a model-independen t lower bound of 2.5 TeV. [S0556-2821(99)01021-8].