2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/140231Using newly calculated electromagnetic corrections, we have made a phase shift analysis of experimental data on pi+/- p elastic scattering up to 100 MeV, assuming the effective hadronic interaction to be isospin invariant. The output consists of parametrised s and p-wave hadronic phases for isospin 1/2 and 3/2. It is not possible to fit the charge exchange data satisfactorily. We give values for the s-wave scattering lengths and effective ranges and for the p-wave scattering volumes. The combinations 2a_1 + a_3 and a_1 - a_3 of s-wave scattering lengths extracted from pionic hydrogen data are compared with those obtained from our analysis.This work is superseded by later papers, see Nucl. Phys. A 778 (2006) 95 and Nucl. Phys. A 794 (2007) 73High Energy Physics - PhenomenologyNuclear Theorytext