Key points are not available for this paper at this time.
We refine our previous calculation of multipole amplitude E₀+ for pion photo-production process, N N. The treatment of final state interactions is based upon an earlier analysis of pion-nucleon scattering within Hamiltonian effective field theory, supplemented by incorporating contributions from the N^* (1650) and the K coupled channel. The contribution from the bare state corresponding to the N^* (1650) significantly enhances our results. Additionally, we also compute the multipole amplitude M₁-, which is of direct relevance to the Roper resonance. The results are comparable with other dynamical coupled channel models, even though the contribution from the bare state (interpreted as a 2s excitation) in this channel is small because of its large mass.
Zhuge et al. (Sun,) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: