BOSE-EINSTEIN CORRELATIONS DUE TO RESONANCE PRODUCTION AND SPACE-TIMEEVOLUTION OF HADRONIC COLLISIONS

We study in a simple model the effects of resonance production and dec ay 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 li fe-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 f orm of the function describing resonance formation. The data of the EH S/NA22 Collaboration require also a, decrease of the chaoticity parame ter lambda with increasing average transfer momentum of identical pion s. It is pointed out that there are similarities between the model bas ed on resonance formation and decay and the one based on hydrodynamica l evolution of hadronic matter. We conjecture that hydrodynamical mode ls in hadronic collisions are describing in a different language the p rocess of resonance formation and decay.