Eur. Phys. J. A (2008) 37: 139-142
https://doi.org/10.1140/epja/i2008-10634-2

Letter

Transverse-mass effective temperature in heavy-ion collisions from AGS to SPS

¹ Gesellschaft für Schwerionenforschung mbH, Planckstr. 1, D-64291, Darmstadt, Germany
² Kurchatov Institute, Kurchatov sq. 1, Moscow, 123182, Russia

^* e-mail: Y.Ivanov@gsi.de

Received: 14 April 2008
Revised: 16 June 2008
Published online: 6 August 2008

Abstract

Transverse-mass spectra in Au + Au and Pb + Pb collisions in the incident energy range from 2A to 160A GeV are analyzed within the model of 3-fluid dynamics (3FD). It is shown that the dynamical description of freeze-out, accepted in this model, naturally explains the incident-energy behavior of the inverse-slope parameters of these spectra observed in experiment. The simultaneous reproduction of the inverse slopes of all considered particles (ρ, π and K) suggests that these particles belong to the same hydrodynamic flow at the instant of their freeze-out.