Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-10-16
Phys.Rev. C63 (2001) 064902
Physics
High Energy Physics
High Energy Physics - Phenomenology
LATEX, 21 pages incl. 7 figures
Scientific paper
10.1103/PhysRevC.63.064902
The equilibration of hot and dense nuclear matter produced in the central cell of central Au+Au collisions at RHIC ($\sqrt{s}=200$ AGeV) 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.
Bass Steffen A.
Bleicher Marcus
Brandstetter M.
Bravina Larissa V.
Faessler Amand
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