Chromomagnetic Dipole Moment of the Top Quark Revisited

Abstract

We study the complete one-loop contributions to the chromagnetic dipole moment $\Delta \kappa$ of the top quark in the Standard Model, two Higgs doublet models, topcolor assited technicolor models (TC2), 331 models and extended models with a single extra dimension. We find that the SM predicts $\Delta \kappa =-0.056$ and that the predictions of the other models are also consitent with the constraints imposed on $\Delta \kappa$ by low-energy precision measurements.

Comments: 20 pages, 5 figures, Update