Bose-Einstein correlations due to resonance production and space-time evolution of hadronic collisions

We study in a simple model the effects of resonance production and decay on Bose-Einstein correlations of identical pions. The intermediate stage of collision is simulated by the formation process of resonances given by a single function of the proper time of a resonance. Direct pions are described as decay products of a resonance with vanishing life-time. In contradistinction to our recent work we include realistic p(T)-distributions of resonances. The comparison with data of the EHS/NA22 Collaboration shows that the mean time of resonance formation is rather short, 0.1-0.4 fm/c. This result is almost independent of the form of the function describing resonance formation. The data of the EHS/NA22 Collaboration require also a, decrease of the chaoticity parameter lambda with increasing average transfer momentum of identical pions. It is pointed out that there are similarities between the model based on resonance formation and decay and the one based on hydrodynamical evolution of hadronic matter. We conjecture that hydrodynamical models in hadronic collisions are describing in a different language the process of resonance formation and decay.