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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
; | | Date: |
26 Oct 2000 | | Journal: | J.Phys. G27 (2001) 421-426 | | Subject: | nucl-th hep-ph | | Affiliation: | 1,2), E.E.Zabrodin (1,2), M.Bleicher , S.A.Bass , M.Brandstetter, A.Faessler, C.Fuchs, W.Greiner, M.I.Gorenstein, S.Soff, H.Stoecker (1 - Institut fuer Theoretische Physik, Tuebingen, Germany; 2 - Institute for Nuclear Physics, Moscow State University | | Abstract: | 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. | | Source: | arXiv, nucl-th/0010088 | | Services: | Forum | Review | PDF | Favorites | |
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