Unraveling models of CP violation through electric dipole moments of light nuclei

TL;DR

This paper explores how upcoming measurements of electric dipole moments in light nuclei can distinguish between different models of CP violation, using effective field theory to analyze their potential constraints.

Contribution

It demonstrates the potential of light-nuclear EDM measurements to differentiate among various CP violation models, including the Standard Model, left-right symmetric models, two-Higgs doublets, and supersymmetry.

Findings

Light-nuclear EDM measurements can strongly constrain CP violation models.

Different models predict distinguishable EDM signatures in nucleons, deuteron, and helion.

Effective field theory helps interpret how these measurements discriminate models.

Abstract

We show that the proposed measurements of the electric dipole moments of light nuclei in storage rings would put strong constraints on models of flavor-diagonal CP violation. Our analysis is exemplified by a comparison of the Standard Model including the QCD theta term, the minimal left-right symmetric model, a specific version of the so-called aligned two-Higgs doublet model, and briefly the minimal supersymmetric extension of the Standard Model. By using effective field theory techniques we demonstrate to what extend measurements of the electric dipole moments of the nucleons, the deuteron, and helion could discriminate between these scenarios. We discuss how measurements of electric dipole moments of other systems relate to the light-nuclear measurements.