Transition to resonance-rich matter in heavy ion collisions at RHIC energies

Details Transition to resonance-rich matter in heavy ion collisions at RHIC energies Transition to resonance-rich matter in heavy ion collisions at RHIC energies

2000-10-26

arxiv.org/abs/nucl-th/0010088v1

J.Phys.G27:421-426,2001

Physics

Nuclear Physics

Nuclear Theory

Talk at the conference Strangeness'2000, to be published in J. of Phys. G

Scientific paper

10.1088/0954-3899/27/3/321

The equilibration of hot and dense nuclear matter produced in the central region in central Au+Au collisions at $\sqrt{s}=200$ AGeV is studied within the microscopic transport model UrQMD. The pressure here becomes isotropic at $t \approx 5$ fm/c. Within the next 15 fm/c the expansion of the matter proceeds almost isentropically with the entropy per baryon ratio $S/A \approx 150$. During this period the equation of state in the $(P,\epsilon)$-plane has a very simple form, $P=0.15 \epsilon$. Comparison with the statistical model (SM) of an ideal hadron gas reveals that the time of $\approx 20$ fm/$c$ may be too short to attain the fully equilibrated state. Particularly, the fractions of resonances are overpopulated in contrast to the SM values. The creation of such a long-lived resonance-rich state slows down the relaxation to chemical equilibrium and can be detected experimentally.

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