Weak dipole moments of heavy fermions with flavor violation induced by Z′ gauge bosons

Abstract

Abstract A calculation of weak dipole moments of charged fermions of the standard model at the one-loop level, in the context of a general effective extended neutral current model with flavor changing Z ′ f i f ¯ j vertices, is presented. We give numerical predictions for the anomalous weak magnetic dipole moment a f i w , and the weak electric dipole moment (WEDM) d f i w , for the τ lepton and t quark. For several Z′ gauge bosons considered, we find that, for the τ lepton, the best prediction for the real part of a τ w is of the order of 10−9, while the imaginary part is four orders of magnitude below. The highest value for the WEDM, d τ w , corresponds to 10−26 e cm, for its real part, and the imaginary part is three orders of magnitude below. Moreover, we found for the top quark, that the best prediction for the real part of a t w is of the order of 10−7 and its imaginary part is of the order of 10−11. We also found that d t w is of the order of 10−26 e cm for its real part, and its imaginary part can be as high as 10−31 e cm.