Abstract
We complete our derivation of upper limits on the violating and couplings from an analysis of their two-loop contributions to the neutron electric dipole moment (nEDM). We use a phenomenological Lagrangian approach which is formulated in terms of hadronic degrees of freedom—nucleons and pseudoscalar mesons. The essential part of the Lagrangian contains the violating couplings between and pions. Previously, we included photons using minimal substitution in case of the proton and charged pions. Now we extend our Lagrangian by adding the nonminimal couplings, i.e., anomalous magnetic couplings of nucleons with the photon. The obtained numerical upper limits for the and couplings and can be useful for the related, planned experiments at the JLab Eta Factory. Using present experimental limits on the nEDM, we derive upper limits on the violating parameter of .
- Received 22 April 2019
DOI:https://doi.org/10.1103/PhysRevD.99.115004
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Published by the American Physical Society