Abstract
In extra dimension theories if the gauge bosons of the standard model propagate in the bulk of the extra dimensions then they will have Kaluza-Klein excitations that can couple to the standard model fermions. In this paper we study the effects of the first excited Kaluza-Klein mode of the W on single top production at the Tevatron. We find that the cross section for the single top production can be significantly reduced if the mass of the first Kaluza-Klein excited W∼1 TeV. Hence, a measurement of the single top production cross section smaller than the standard model prediction would not necessarily imply V tb <1 or evidence of extra generation(s) of fermions mixed with the third generation.
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