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

  • 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.

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Author:Adrian Bogdan DumitruORCiDGND, Jörg BrachmannGND, Marcus BleicherORCiDGND, Joachim MaruhnORCiDGND, Horst StöckerORCiDGND, Walter GreinerGND
Document Type:Preprint
Date of Publication (online):2006/01/16
Year of first Publication:1997
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2006/01/16
Tag:AGS; Kollisionen schwerer Ionen; SPS
AGS; SPS; heavy-ion collisions
Source:Heavy Ion Phys. 5 (1997) 357-36. [nucl-th/9705056]
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht