Neutron electric dipole moment: Constituent dressing and compositeness

Contributions to the neutron’s electric dipole moment (EDM), $d_n,$ are calculated using a well-constrained ansatz for the nucleon’s Poincaré covariant Fadde’ev amplitude. The momentum-dependent quark dressing amplifies the contribution from the current-quarks’ EDMs; and dressed-quark confinement and binding make distinguishable the effect of the two $\mathrm{CP}$ and T violating interactions: $i{\gamma }_5{\sigma }_{\mu \nu }{(p}_1-p_2{)}_{\nu }$ and ${\gamma }_5{(p}_1{+p}_2{)}_{\mu },$ where $p_{1,2}$ are the current-quarks’ momenta. The value of $|d_n|$ obtained using the current-quark EDMs generated by a minimal three Higgs doublet model of spontaneous $\mathrm{CP}$ violation is close to the current experimental upper bound.