Probes for the early reaction dynamics of heavy-ion collisions at AGS and SPS

Abstract

We discuss the early evolution of ultrarelativistic heavy-ion collisions within a multi-fluid dynamical model. In particular, we show that due to the finite mean-free path of the particles compression shock waves are smeared out considerably as compared to the one-fluid limit. Also, the maximal energy density of the baryons is much lower. We discuss the time scale of kinetic equilibration of the baryons in the central region and its relevance for directed flow. Finally, thermal emission of direct photons from the fluid of produced particles is calculated within the three-fluid model and two other simple expansion models. It is shown that the transverse momentum and rapidity spectra of photons give clue to the cooling law and the early rapidity distribution of the photon source.

Proceedings of the workshop on hydrodynamics at ECT*, May 12-17 (1997); to be published in Heavy-Ion Phys

Cited by in corpus (6)

• Relativistic Heavy-Ion Collisions within 3-Fluid Hydrodynamics: Hadronic Scenario
• Equation of State, Radial Flow and Freeze-out in High Energy Heavy Ion Collisions
• Hydrodynamics Near a Chiral Critical Point
• Dynamical Freeze-out in 3-Fluid Hydrodynamics
• Entropy Production in Collisions of Relativistic Heavy Ions -- a signal for Quark-Gluon Plasma phase transition?
• Direct photons in Pb+Pb at CERN-SPS from microscopic transport theory