Equation of state of resonance-rich matter in the central cell in heavy-ion collisions at √s =200 A GeV

  • The equilibration of hot and dense nuclear matter produced in the central cell of central Au+Au collisions at RHIC (sqrt s = 200 A GeV) energies is studied within a microscopic transport model. The pressure in the cell becomes isotropic at t approx 5 fm/c after beginning of the collision. Within the next 15 fm/c the expansion of matter in the cell proceeds almost isentropically with the entropy per baryon ratio S/A approx 150, and the equation of state in the (P,epsilon) plane has a very simple form, P=0.15 epsilon. Comparison with the statistical model of an ideal hadron gas indicates that the time t approx 20 fm/c may be too short to reach the fully equilibrated state. Particularly, the creation of long-lived resonance-rich matter in the cell decelerates the relaxation to chemical equilibrium. This resonance-abundant state can be detected experimentally after the thermal freeze-out of particles.

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Author:Larissa BravinaORCiDGND, Eugene E. Zabrodin, Steffen A. BassORCiDGND, Marcus BleicherORCiDGND, Mathias Brandstetter, Amand FäßlerGND, Christian Fuchs, Walter GreinerGND, Sven SoffORCiD, Horst StöckerORCiDGND
ArXiv Id:http://arxiv.org/abs/hep-ph/0010172v1
Document Type:Preprint
Year of Completion:2000
Date of first Publication:2000/10/16
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/04/14
Page Number:21
First Page:1
Last Page:21
Später erschienen in: Physical review. C, Nuclear physics, 63.2001, Nr. 6, Art. 064902, doi:10.1103/PhysRevC.63.064902
Source:http://de.arxiv.org/abs/hep-ph/0010172 , Phys.Rev. C63 (2001) 064902
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
PACS-Classification:20.00.00 NUCLEAR PHYSICS / 24.00.00 Nuclear reactions: general / 24.10.-i Nuclear reaction models and methods / 24.10.Lx Monte Carlo simulations (including hadron and parton cascades and string breaking models)
20.00.00 NUCLEAR PHYSICS / 24.00.00 Nuclear reactions: general / 24.10.-i Nuclear reaction models and methods / 24.10.Pa Thermal and statistical models
20.00.00 NUCLEAR PHYSICS / 25.00.00 Nuclear reactions: specific reactions / 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)
60.00.00 CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES / 64.00.00 Equations of state, phase equilibria, and phase transitions (see also 82.60.-s Chemical thermodynamics) / 64.30.-t Equations of state of specific substances
Licence (German):License LogoDeutsches Urheberrecht