The electron and neutron EDM from supersymmetric see-saw thresholds

TL;DR

This paper investigates how heavy fields in supersymmetric see-saw models contribute to electric dipole moments of the electron and neutron, revealing potential observable effects and distinctive ratios.

Contribution

It demonstrates that different see-saw mechanisms induce specific radiative corrections to EDMs, highlighting new sources of CP violation in supersymmetric models.

Findings

Heavy right-handed neutrinos induce EDM contributions.

Type-II and III see-saw models affect gaugino masses.

Predicted EDM ratios could be experimentally observable.

Abstract

We consider the corrections that arise at one loop when integrating out heavy fields in supersymmetric models. We show that, in type-I see-saw models, complex A and B terms of the heavy right-handed neutrino give radiative contributions to the neutron EDM, as well as new dominant contributions to the electron EDM. Type-II and type-III see-saw also predict a pure gauge correction that makes complex the masses of the weak gauginos. All the see-saw models can predict observable EDM for the electron and for the neutron in a peculiar ratio.