THE ANALYSIS OF TN - ~7rN AND COUPLED CHANNEL ANALYSES OF TN REACTIONS*

The status of partial wave analyses of TN nnN in the energy range 1300 < E < 2000 MeV is reviewed. In the majority of partial waves the total nN inelasticity is accounted for and the inelastic decay channels of many resonances are observed. In total 23 resonance couplings to the states nA, Np, NE are measured both in magnitude and sign. The DI3 state in the region of 1700 MeV is unambiguously observed while there is a conspicuous absence of P33 states below 2000 MeV. Coupled channel analyses of these partial wave amplitudes, exploiting unitarity to the fullest extent, have been performed resulting in pole positions and residues for all resonant states with mass < 1900 MeV. Finally the different methods of estimating resonance parameters are discussed and the results contrasted.