Electromagnetic properties of the πNN system: (II). The γD → Dπ° reaction

By computing the non-relativistic limits of the direct and the pion-nucleon rescattering amplitudes, we have obtained a good accounting for the available experimental data, both at threshold and in the Δ(1236) region. The effects of the Fermi motion were fully taken into account. At threshold the pion-nucleon rescattering diagram is very important, and we have studied the sensitivity of the results to the different ingredients of the calculation: the deuteron wave function, the pion propagator, the elementary operators, etc. In the Δ(1236) region the rescattering effects are small and the cross section is mainly sensitive to the direct term. Here the Fermi motion effects are important and the kinematical ambiguities in the elementary amplitudes are avoided in our treatment. The good overall agreement with the data gives us some confidence in the methods we are using in this series of papers which study the electromagnetic properties of the πNN system.