Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1996-07-23
Eur.Phys.J.C1:599-617,1998
Physics
Nuclear Physics
Nuclear Theory
38 pages, REVTeX, 11 PS-figures, to be published in Z.Phys.C
Scientific paper
10.1007/s100520050109
The Yano-Koonin-Podgoretskii (YKP) parametrisation of Hanbury Brown-Twiss (HBT) two-particle correlation functions opens new strategies for extracting the emission duration and testing the longitudinal expansion in heavy-ion collisions. Based on the recently derived model-independent expressions, we present a detailed parameter study of the YKP parameters for a finite, hydrodynamically expanding source model of heavy-ion collisions. For the class of models studied here, we show that the three YKP radius parameters have an interpretation as longitudinal extension, transverse extension and emission duration of the source in the YKP frame. This frame is specified by the fourth fit parameter, the Yano-Koonin velocity which describes to a good approximation the velocity of the fluid element with highest emissivity and allows to test for the longitudinal expansion of the source. Deviations from this interpretation of the YKP parameters are discussed quantitatively.
Heinz Ulrich
Tomasik Boris
Wiedemann Urs Achim
Wu Yong-Fu
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