Two- And Three-Dimensional Analysis Of Bose-Einstein Correlations In Pi(+)/K(+)P Interactions At 250 Gev/C

The NA22 data on pi(-)pi(-) correlations are analyzed in terms of a number of two- and three-dimensional parametrizations (Gaussian space-time, Goldhaber, Bowler string-like, Bertsch hydrodynamical, Kopylov-Podgoretskii, etc.), Contrary to the results obtained for e(+)e(-) and mu p collisions, the Goldhaber parametrization, as well as string-like models, fail in describing the hadron-hadron data. Better fits are obtained in the framework of surface-emitting fireball-like models, both when including and excluding hydrodynamical expansion of nuclear matter. Our results indicate that pion radiation occurs at earlier stages of matter evolution than in nuclear collisions.