In lepton-flavour-violating new physics models where heavy states do not couple to right-handed charged leptons, one-loop electric dipole moments vanish in both the mass and Yukawa bases, leaving two-loop effects as the leading contribution.
A Complete Analysis of "Flavored" Electric Dipole Moments in Supersymmetric Theories
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abstract
The Standard Model predictions for the hadronic and leptonic electric dipole moments (EDMs) are well far from the present experimental resolutions, thus, the EDMs represent very clean probes of New Physics effects. Especially, within supersymmetric frameworks with flavor-violating soft terms large and potentially visible effects to the EDMs are typically expected. In this work, we systematically evaluate the predictions for the EDMs at the beyond-leading-order (BLO). In fact, we show that BLO contributions to the EDMs dominate over the leading-order (LO) effects in large regions of the supersymmetric parameter space. Hence, their inclusion in the evaluation of the EDMs is unavoidable. As an example, we show the relevance of BLO effects to the EDMs for a SUSY $SU(5)$ model with right-handed neutrinos.
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Left-Handed Physics is not right for EDMs
In lepton-flavour-violating new physics models where heavy states do not couple to right-handed charged leptons, one-loop electric dipole moments vanish in both the mass and Yukawa bases, leaving two-loop effects as the leading contribution.