Local equilibrium in heavy ion collisions. Microscopic model versus statistical model analysis

The assumption of local equilibrium in relativistic heavy ion collisions at energies from 10.7 AGeV (AGS) up to 160 AGeV (SPS) is checked in the microscopic transport model. Dynamical calculations performed for a central
The assumption of local equilibrium in relativistic heavy ion collisions at energies from 10.7 AGeV (AGS) up to 160 AGeV (SPS) is checked in the microscopic transport model. Dynamical calculations performed for a central cell in the reaction are compared to the predictions of the thermal statistical model. We find that kinetic, thermal and chemical equilibration of the expanding hadronic matter are nearly approached late in central collisions at AGS energy for t >= 10 fm/c in a central cell. At these times the equation of state may be approximated by a simple dependence P ~= (0.12-0.15) epsilon. Increasing deviations of the yields and the energy spectra of hadrons from statistical model values are observed for increasing energy, 40 AGeV and 160 AGeV. These violations of local equilibrium indicate that a fully equilibrated state is not reached, not even in the central cell of heavy ion collisions at energies above 10 AGeV. The origin of these findings is traced to the multiparticle decays of strings and many-body decays of resonances.
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Metadaten
Author:Larissa V. Bravina, Eugene E. Zabrodin, Mark I. Gorenstein, Steffen A. Bass, Mohamed Belkacem, Marcus Bleicher, Mathias Brandstetter, Christoph Ernst, Markus Hofmann, Ludwig Neise, Sven Soff, Henning Weber, Horst Stöcker, Walter Greiner
URN:urn:nbn:de:hebis:30-7074
Document Type:Preprint
Language:English
Date of Publication (online):2005/04/14
Year of first Publication:1999
Publishing Institution:Univ.-Bibliothek Frankfurt am Main
Release Date:2005/04/14
Source:http://de.arxiv.org/abs/hep-ph/9906548 , REVTEX, 37 pages (incl. 20 figs.), to be published in Phys.Rev. C60 (1999) 024904
HeBIS PPN:128789549
Institutes:Physik
Dewey Decimal Classification:530 Physik
PACS-Classification:24.10.Lx Monte Carlo simulations (including hadron and parton cascades and string breaking models)
24.10.Pa Thermal and statistical models
25.75.-q Relativistic heavy-ion collisions (collisions induced by light ions studied to calibrate relativistic heavy-ion collisions should be classified under both 25.75.-q and sections 13 or 25 appropriate to the light ions)
Sammlungen:Universitätspublikationen
Licence (German):License Logo Veröffentlichungsvertrag für Publikationen

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