Transition to resonance-rich matter in heavy ion collisions at RHIC energies
L. V. Bravina, E. E. Zabrodin, M. Bleicher, S. A. Bass, M. Brandstetter, A. Faessler, C. Fuchs, W. Greiner, M. I. Gorenstein, S. Soff, H. Stoecker
Abstract
The equilibration of hot and dense nuclear matter produced in the central region in central Au+Au collisions at s=200 AGeV is studied within the microscopic transport model UrQMD. The pressure here becomes isotropic at t ≈ 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 ≈ 150. During this period the equation of state in the (P,ε)-plane has a very simple form, P=0.15 ε. Comparison with the statistical model (SM) of an ideal hadron gas reveals that the time of ≈ 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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