Cancellation mechanism for the electron electric dipole moment connected with the baryon asymmetry of the Universe

TL;DR

This paper proposes a cancellation mechanism within the two Higgs doublet model that explains the electron electric dipole moment and supports electroweak baryogenesis, aligning new Yukawa couplings with observed fermion hierarchies.

Contribution

It introduces a novel cancellation mechanism for the electron EDM in the two Higgs doublet model, expanding the viable parameter space for baryogenesis.

Findings

Cancellation mechanism allows large new Yukawa couplings without conflicting with EDM measurements.

Hierarchical structure of new Yukawa couplings mirrors Standard Model patterns.

Supports electroweak baryogenesis with extended Yukawa interactions.

Abstract

We elucidate a cancellation mechanism for the electric dipole moment of the electron in the general two Higgs doublet model. The impressive improvement by the ACME Collaboration in 2018 suggests the presence of a new electron Yukawa coupling that brings in exquisite cancellations among dangerous diagrams, broadening the solution space for electroweak baryogenesis driven by an extra top Yukawa coupling. The cancellation mechanism calls for the new Yukawa couplings to have hierarchical structures that echo the observed pattern of the Standard Model Yukawa couplings.