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.
P and T Odd Asymmetries in Lepton Flavor Violating Tau Decays
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abstract
We calculated the differential cross sections of the processes in which one of the pair created tau particles at an e^+ e^- collider decays into lepton flavor violating final states e.g. tau -> mu gamma, tau -> 3 mu, tau -> mu ee. Using the correlations between angular distributions of both sides of tau decays, we can obtain information on parity and CP violations of lepton flavor non-conserving interactions. The formulae derived here are useful in distinguishing different models, since each model of physics beyond the standard model predicts different angular correlations. We also calculate angular distributions of the major background process to tau -> l gamma search, namely tau -> l nu \bar{\nu} gamma, and discuss usefulness of the angular correlation for background suppression.
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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.