LOW-ENERGY PION-NUCLEON SCATTERING

An analysis of low-energy charged pion-nucleon data From recent pi(+/- )p experiments is presented. From the scattering lengths and the Goldb erger-Miyazawa-Oehme (GMO) sum rule we find a value of the pion-nucleo n coupling constant of f(2) = 0.0756 +/- 0.0007. We also find, contrar y to most previous analyses, that the scattering volumes for the P-31 and P-13 partial waves are equal, within errors, corresponding to a sy mmetry found in the Hamiltonian of many theories. For the potential mo dels used, the amplitudes are extrapolated into the subthreshold regio n to estimate the value of the Sigma term. Off-shell amplitudes are al so provided.