Large Tau and Tau Neutrino Electric Dipole Moments in Models with Vector Like Multiplets

TL;DR

This paper demonstrates that models with vector-like multiplets can produce tau and tau neutrino electric dipole moments significantly larger than standard model predictions, potentially observable with future experiments.

Contribution

It introduces a model with vector-like multiplets that predicts enhanced tau and tau neutrino EDMs, which are testable with upcoming experimental sensitivities.

Findings

Tau EDM can be several orders of magnitude larger than standard model predictions.

Tau neutrino EDM is also significantly enhanced and close to experimental detection limits.

Predicted EDMs are within a couple of orders of magnitude of current experimental sensitivity.

Abstract

It is shown that the electric dipole moment of the tau lepton several orders of magnitude larger than predicted by the standard model can be generated from mixings in models with vector like mutiplets. The EDM of the tau lepton arises from loops involving the exchange of the W, the charginos, the neutralinos, the sleptons, the mirror leptons, and the mirror sleptons. The EDM of the Dirac tau neutrino is also computed from loops involving the exhange of the W, the charginos, the mirror leptons and mirror sleptons. A numerical analysis is presented and it is shown that the EDMs of the tau lepton and of the tau neutrino which lie just a couple of orders of magnitude below the sensitivity of the current experiment can be achieved. Thus the predictions of the model are testable in improved experiment on the EDM of the tau and of the tau neutrino.