Single pion production in proton-proton collisions according to the one-particle exchange model

Abstract

Single pion production in nucleon-nucleon collisions is calculated in the one-pion exchange approximation. All the possible diagrams of this kind are calculated in the ≪ pole ≫ approximation discussed in the text: also the interferences between them are taken into account. The lab. energy spectra of the final nucleons are calculated and compared with the experimental data at 2.85 GeV. This comparison shows a remarkably good agreement for small values of the squared 4-momentum, of the virtual pion. For higher values the qualitative behaviour is still reproduced, but the theoretical absolute values are larger than the experimental ones.