Weinberg Operator Contribution to the Hadronic CP Violation

TL;DR

This paper reviews the Weinberg operator's role in CP violation, focusing on its contribution to neutron and nuclear EDMs, especially the $^3$He nucleus, within beyond Standard Model physics.

Contribution

It provides a comprehensive review of the Weinberg operator's effects and estimates its impact on the $^3$He EDM via contact CP-odd nuclear forces.

Findings

Weinberg operator significantly contributes to nuclear EDMs.

Estimated impact on $^3$He EDM enhances understanding of CP violation.

Review consolidates current theoretical and phenomenological insights.

Abstract

The CP violating Weinberg operator (or the gluon chromo-electric dipole moment) is generated in many candidates of new physics beyond the standard model, and it contributes to observables such as the electric dipole moments (EDM) of the neutron, nuclei and atoms. In this proceedings contribution, we review the present understanding of the Weinberg operator as well as the result of the estimation of its effect to the EDM of $^3$He nucleus through the contact CP-odd nuclear force.