Baryon form factors in a diquark-quark bound state description

Nucleon form factors are calculated in a relativistic diquark-quark picture based on the Nambu-Jona-Lasinio model. The nucleon wave function is obtained in a static approximation to the quark exchange interaction between the valence quark and the diquark. We evaluate the valence quark and 0+-diquark contribution to the nucleon electromagnetic and weak currents. We find reasonable electric charge radii, magnetic moments as in the additive diquark model, and gA ≈ 1. We discuss the dependence on the model parameters.