Dynamical coupled-channels model of πN scattering in the W⩽2 GeV nucleon resonance region

摘要: As a first step to analyze the electromagnetic meson production reactions in nucleon resonance region, parameters of hadronic interactions dynamical coupled-channels model, developed Physics Reports 439, 193 (2007), are determined by fitting π Ν-scattering data. The channels included calculations πN, ηN, and ππN, which has πΔ, pN, aN resonant components. nonresonant meson-baryon model derived from set Lagrangians using unitary transformation method. One or two bare excited states each S, P, D, F partial waves generate amplitudes fits. as much possible empirical nN elastic-scattering SAID up 2 GeV. We then refine confirm resulting directly comparing predicted differential cross section target polarization asymmetry with original data elastic ± p → charge-exchange - 0 n processes. total sections πN ηN also good agreement Applications constructed analyzing well future developments discussed.