The NA22 data on π- π- correlations are analyzed in terms of a number of two-and three-dimensional parametrizations (Gaussian space-time, Goldhaber, Bowler string-like, Bertsch hydrodynamical, Kopylov-Podgoretskiǐ, etc.). Contrary to the results obtained for e+e- and μp 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.
|Original language||English (US)|
|Number of pages||10|
|Journal||European Physical Journal C|
|State||Published - Dec 1 2011|
ASJC Scopus subject areas
- Engineering (miscellaneous)
- Physics and Astronomy (miscellaneous)