CP violating dark photon kinetic mixing and type-III seesaw model

TL;DR

This paper introduces a renormalizable model linking CP-violating dark photon kinetic mixing with the type-III seesaw mechanism, suggesting potential observable effects in electron EDM measurements.

Contribution

It constructs the first renormalizable model for CP-violating kinetic mixing involving non-Abelian gauge bosons, connecting dark photon physics with neutrino mass generation.

Findings

Model predicts electron EDM close to current experimental bounds.

Links CP-violating kinetic mixing to neutrino mass origin.

Highlights importance of future EDM experiments for testing the model.

Abstract

The hypothetical dark photon portal connecting the visible and dark sectors of the Universe has received considerable attention in recent years, with a focus on CP-conserving kinetic mixing between the Standard Model (SM) hypercharge gauge boson and a new U(1)$_X$ gauge boson. In the effective field theory context, one may write down non-renormalizable CP-violating kinetic mixing interactions involving the $X$ and SU(2)$_L$ gauge bosons. We construct for the first time a renormalizable model for CP-violating kinetic mixing that induces CP-violating non-Abelian kinetic mixing at mass dimension five. The model grows out of the type-III seesaw model, with the lepton triplets containing right-handed neutrinos playing a crucial role in making the model renormalizable and providing a bridge to the origin of neutrino mass. This scenario also accommodates electron electric dipole moments (EDM) as large as current experimental bound, making future EDM searches an important probe of this scenario.