Nucleon form factors and a nonpointlike diquark

Nucleon form factors are calculated on $q^2\in [0,3]{\mathrm{GeV}}^2$ using an ansatz for the nucleon’s Faddeev amplitude motivated by quark-diquark solutions of the relativistic Faddeev equation. Only the scalar diquark is retained, and it and the quark are confined. A good description of the data requires a nonpointlike diquark correlation with an electromagnetic radius of $0.8r_{\pi }.$ The composite, nonpointlike nature of the diquark is crucial. It provides for diquark-breakup terms that are of greater importance than the diquark photon absorption contribution.