Form Factors and the Absorptive One-Pion-Exchange Model

Abstract

The one-pion-exchange model, corrected for absorption in the initial and final states, is examined for those two-body reactions involving the production of high-spin particles. It is found that the inclusion of form factors brings the theory into agreement with experiment. By consideration of a number of reactions, explicit expressions for the $N\pi N^{*}$ (1238) and $\pi \pi f$ vertex function form factors are obtained. It is shown that these form factors do not require the existence of any as yet undiscovered mesons. Implications of these form factors in two-pion-exchange calculations are also discussed.