A comparison of multiplicity distributions and two-particle rapidity correlations in antiproton-proton and proton-proton interactions at the CERN-ISR

We have investigated the properties of topological cross-sections and particle correlations in antiproton-proton and proton-proton collisions at the CERN ISR. The distribution of the antipp-pp difference in topological cross sections has a shape and energy dependence markedly different from the antipp or pp distributions. Instead it is found to be similar to the multiplicity distributions found in very inelastic processes, such as e+e- annihilation into hadrons. A direct comparison of two-body rapidity correlations in antipp and pp interactions shows that, in the antipp case, there is, superimposed on the usual short-range correlation, a correlation of very short range. A simple quark-antiquark annihilation model is proposed to explain this effects