Quark model analysis of the Weinberg operator contribution to the nucleon EDM

TL;DR

This paper evaluates the contribution of the Weinberg operator, a CP-violating gluonic term, to the neutron's electric dipole moment using a nonrelativistic quark model with the Gaussian expansion method.

Contribution

It provides a novel calculation of the Weinberg operator's impact on nucleon EDM within a nonrelativistic quark framework.

Findings

Quantitative estimate of the Weinberg operator's contribution to nucleon EDM.

Application of the Gaussian expansion method to this problem.

Insights into CP violation effects in nucleons.

Abstract

The Weinberg operator (chromo-electric dipole moment of gluon) is a CP violating quantity 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 or atoms which are currently measured in experiments. In this proceedings contribution, we report on our result of the evaluation of the Weinberg operator contribution to the nucleon EDM in the nonrelativistic quark model using the Gaussian expansion method.