EDMs -- signs of CP violation from physics beyond the Standard Model

TL;DR

This paper discusses the limitations of current methods for estimating electric dipole moments (EDMs) as signals of CP violation beyond the Standard Model, highlighting the need for improved understanding of QCD regimes.

Contribution

It critically examines the assumptions behind EDM calculations and emphasizes the importance of bridging perturbative and nonperturbative QCD for accurate predictions.

Findings

Current EDM bounds may be underestimated due to incomplete QCD understanding.

Existing computational routines for EDM evaluation are still relevant despite outdated assumptions.

A better theoretical framework is needed for interpreting EDM measurements as signs of new physics.

Abstract

The limits placed by the non-measurement of atomic and neutron electric dipole moments on CP violating phases beyond the SM are found to be not fully justified since the calculations of the expected EDMs lack the full understanding of the connection between perturbative and nonperturbative regimes of QCD for the measured boundstates. As a consequence rather old subroutines for the evaluation of EDMs are still usable.