Fermion electric dipole moments induced by P- and T-odd WW gamma interactions in the minimal supersymmetric standard model and multi-Higgs-boson model.

Abstract

We calculate fermion electric dipole moments generated by P- and T-odd WW\ensuremath{\gamma} interactions in the supersymmetry and multi-Higgs-boson models without using an approximation first introduced by Marciano and Queijeiro. In essence, this approximation consists of ignoring the details of the high energy physics responsible for the W electric dipole moment. For the minimal supersymmetry model, our more exact results are roughly three times those obtained from the simplest application of the above-mentioned approximation for gaugino masses larger than ${\mathit{m}}_{\mathit{W}}$. However, if the gaugino masses are \ensuremath{\lesssim}${\mathit{m}}_{\mathit{W}}$, our results are less than would be expected from the Marciano-Queijeiro estimate. In part, because of this suppression, we discover that the experimental bounds on ${\mathit{d}}_{\mathit{n}}$ place no restrictions on either the allowed values of ${\mathit{d}}_{\mathit{W}}$ or on the permitted masses of the minimal supersymmetry model. This contradicts the findings of Vendramin who used the Marciano-Queijeiro results to deduce such prohibited regions of parameter space and mildly improves the prospects of observing a nonzero W-boson electric dipole moment in accelerator experiments. In the case of the multi-Higgs-boson model, we again find fermion electric dipole moments that are three times those expected from a simple application of the Marciano-Queijeiro technique. In addition, when this result is combined with a complete two-loop calculation of the W electric dipole moment, we find that the fermion electric dipole moments generated in this way are approximately 30 times those expected from a previous calculation by He and McKellar.