HYBRID MODEL - FURTHER RESULTS

In a previous paper we proposed a « hybrid » model for the large-energy, small-angle elastic scattering of hadrons, and used it to understand the structure in the angular distributions of proton-proton and proton-antiproton differential cross-sections. This model describes the scattering amplitude as the sum of an optical diffractive piece and a piece arising from the exchange of « absorbed » Regge poles; alternatively, it can be viewed as a specific prescription for calculating the effects of Regge cuts. In the present paper, we present some further results obtained from this hybrid model: we extrapolate our solutions for the pp amplitude to higher energies. We show how our model may be extended to deal with inelastic (or backward elastic) scattering, and consider processes which cannot be described by the single exchange of any known Regge trajectory, such as K-p backward elastic scattering. We explain why Regge cuts do not affect the presence or location of the dip in the π+p near-backward differential cross-section which is thought to arise from a nonsense zero of the nucleon trajectory. We predict that the differential cross-sections of elastic and of inelastic reactions should have the same t-dependence at large |t|, whether or not they do at small |t|. © 1969 Società Italiana di Fisica.