We clarify some misleading mistakes in the literature about the phase space for the one-photon production in electron-proton scattering and present the correct overall phase space factor in the cross section formula. Our conclusion is that the earlier diquark model predictions for the cross sections and spin asymmetries of the one-photon production in electron-proton scattering are unreliable. ...

An approximate inverse scattering method [5, 6] has been used to construct separable potentials with the Laguerre form factors. As an application, we invert the phase shifts of proton-proton in the S0 and P2 − 3 F2 channels and neutron-proton in the S1 − 3 D1 channel elastic scattering. In the latter case the deuteron wave function of a realistic np potential was used as input.