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The Yano-Koonin-Podgoretskii (YKP) parametrisation of Hanbury Brown-Twiss(HBT) two-particle correlation functions opens new strategies for extractingthe emission duration and testing the longitudinal expansion in heavy-ioncollisions. Based on the recently derived model-independent expressions, wepresent a detailed parameter study of the YKP parameters for a finite,hydrodynamically expanding source model of heavy-ion collisions. For the classof models studied here, we show that the three YKP radius parameters have aninterpretation as longitudinal extension, transverse extension and emissionduration of the source in the YKP frame. This frame is specified by the fourthfit parameter, the Yano-Koonin velocity which describes to a good approximationthe velocity of the fluid element with highest emissivity and allows to testfor the longitudinal expansion of the source. Deviations from thisinterpretation of the YKP parameters are discussed quantitatively.Comment: 38 pages, REVTeX, 11 PS-figures, to be published in Z.Phys.

Yano-Koonin-Podgoretskii parametrisation of the Hanbury Brown-Twiss correlator