Effects of Kaluza-Klein excitations ongμ−2

An analysis of the effects associated with the Kaluza-Klein excitations of the photon and of the W and Z bosons on $g_{\mu }-2$ for d number of extra dimensions with large radius compactifications is given. The Kaluza-Klein effects on $g_{\mu }-2$ are found to be very sensitive to the number of extra dimensions. For models where the quark-lepton generations live on the four-dimensional wall, it is shown that when the constraints from the Kaluza-Klein corrections to the Fermi constant are included, the effects of the Kaluza-Klein excitations to $g_{\mu }-2$ become too small to be observable. A model which evades Kaluza-Klein corrections to the muon decay $\overrightarrow{\mu }e{\overline{\nu }}_e{\nu }_{\mu }$ without suppression of their effects on $g_{\mu }-2$ is discussed.