1993/06/29 by P. LaFrance, Earle L. Lomon, LaFrance, P. +4 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #Nuclear Theory (nucl-th) #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-th
paper · pdf · doi:10.48550/arxiv.nucl-th/9306026
31 pages in Plain TeX (with figures to be added using FIGURES command), MIT CTP #2133
arxiv created 1993/06/29 · openalex publication_date 1993/06/29 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The NN scattering near inelastic threshold is sensitive to the long-range diagonal interaction in the produced isobar channel. Earlier models included meson exchange potentials in the NN sector and connecting that sector to isobar channels, as well as an R-matrix description of short-range quark effects. Including the diagonal pion exchange contributions in the NΔ channels coupled to the very inelastic 1D2 and 3F3 NN channels substantially improves those phase parameters and the observables ΔσL and ΔσT. The same improvement is made to the other I=1 NN channels. In the 1S0 NN channel coupling to the ΔΔ channel is unusually important due to the L=2 angular momentum barrier in the NΔ channel. The pion exchange transition potentials between isobar channels are included in this partial wave to obtain the correct equilibrium between one- and two-pion decay channels. Other improvements to earlier models have been made, in the specification of isobar channels and the inclusion of decay width effects in more channels. A comparison is made with all the pp data for TL ≤ 800~MeV, producing a very good fit over the whole energy range.