Circumstantial evidence for transverse flow in 200AGeV S+S collisions

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Abstract
The hadronic spectra of 200A GeV S+S collisions are analyzed assuming thermal emission of particles including resonance decays. While the rapidity distributions suggest a longitudinal flow almost independent of the temperature, the transverse momentum spectra exhibit an ambiguity between transverse flow and temperature, which cannot be resolved by the spectra of the heavier particles. However, in a theoretical model for the global hydrodynamic expansion with a dynamical freeze-out criteron, we find that almost inevitably a sizable transverse flow develops, which is in quantitative agreement with the data.