Abstract
The particle transverse momentum spectra recently measured in relativistic heavy-ion collisions at CERN and BNL are analysed within an expanding fireball model. All the particle spectra at a given beam energy can be reproduced simultaneously with a single set of intensive parameters for the initial state of the fireball. As typical freeze-out parameters in this beam energy region we find a freeze-out temperatureT f≃110 MeV for most hadrons, and an average transverse expansion velocity at freeze-out of 〈v/c〉≃0.4–0.45. The striking enhancement at transverse momentap T<200 MeV/c in the CERN pion data cannot be fully explained by the existence of transverse flow.
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Work supported in part by Deutsche Forschungsgemeinschaft (DFG), grant He1283/3-1, and by the Korean Science and Engineering Foundation (KOSEF), grant 893-0202-002-2
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Seog Lee, K., Heinz, U. & Schnedermann, E. Search for collective transverse flow using particle transverse momentum spectra in relativistic heavy-ion collisions. Z. Phys. C - Particles and Fields 48, 525–541 (1990). https://doi.org/10.1007/BF01572035
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DOI: https://doi.org/10.1007/BF01572035