π−+p→η+nReaction near Threshold and Resonant States of theπ−+pSystem

We calculate the differential cross sections for the reaction ${\pi }^{-}+p\to \eta +n$ in the $T_{\pi }=593\mathrm{}$ MeV to $T_{\pi }=704\mathrm{}$ MeV energy range using field-theoretic techniques, and taking into account three resonant states of the ${\pi }^{-}+p$ system. We find interference effects among these resonances to be of importance, and that locating the resonances at 1430, 1512, and 1567 MeV gives the best fit to the experimental data.