Quark Chromoelectric Dipole Moment Contribution to the Neutron Electric Dipole Moment

TL;DR

This paper explores the contribution of the quark chromoelectric dipole moment to the neutron electric dipole moment using lattice QCD techniques, providing preliminary results on signal quality for future precise calculations.

Contribution

It introduces a method to include the quark chromoelectric dipole moment operator in nucleon form factor calculations using the Schwinger source approach on lattice QCD.

Findings

Preliminary signals obtained for the relevant correlators.

Demonstrates the feasibility of calculating neutron EDM contributions.

Shows potential for more precise future computations.

Abstract

The quark chromo-electric dipole moment operator and the pseudo-scalar fermion bilinear with which it mixes under renormalization can both be included in a calculation of the electromagnetic form factor of the nucleon using the Schwinger source method. A preliminary calculation of these operators using clover quarks on HISQ lattices generated by MILC collaboration will be presented showing the quality of the signal in the correlators necessary for calculating the neutron electric dipole moment.