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Zeitschrift für Physik C
ISSN: 0170-9739 (printed version)
ISSN: 1431-5858 (electronic version)
Abstract Volume 74 Issue 3 (1997) pp 535-540
Hadron spectra from nuclear collisions
A. Leonidov (1) (*), M. Nardi (2) (**), H. Satz (1)
(1) Fakultät für Physik, Universität Bielefeld, D-33501 Bielefeld, Germany
(2) Theory Division, CERN, CH-1211 Geneva, Switzerland
Received: 4 June 1996
Abstract. We describe high energy nuclear collisions by a superposition of isotropically decaying thermal sources ("fireballs") of freeze-out temperature T=0.15 GeV. The longitudinal fireball superposition is taken as boost-invariant, in a rapidity range determined by the average energy loss of nucleons in p-p collisions. The transverse fireball motion is assumed to be due to random walk initial state collisions; it is determined by p-A data and then extrapolated to central A-B interactions. We thus obtain parameter-free predictions for the rapidity and transverse momentum spectra of hadrons produced in high energy nucleus-nucleus collisions. The results account fully for the observed broadening of transverse momentum distributions, so that single-particle spectra require neither collective flow nor temperature increase.
(*) Alexander von Humboldt-Fellow, on leave from the Lebedev Institute, Moscow, Russia
(**) University of Torino Fellow, on leave from the INFN, Torino, Italy
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