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


Journal Article

The equilibration of hot and dense nuclear matter produced in the central cell of central Au+Au collisions at √s=200A GeV is studied within a microscopic transport model. The pressure in the cell becomes isotropic at t≈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≅150, and the equation of state in the (P,ε) plane has a very simple form, P=0.15ε. Comparison with the statistical model of an ideal hadron gas indicates that the time t≈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.

Duke Authors

Cited Authors

  • Bravina, LV; Zabrodin, EE; Bass, SA; Bleicher, M; Brandstetter, M; Faessler, A; Fuchs, C; Greiner, W; Soff, S; Stöcker, H

Published Date

  • January 1, 2001

Published In

Volume / Issue

  • 63 / 6

Start / End Page

  • 649021 - 649028

Electronic International Standard Serial Number (EISSN)

  • 1089-490X

International Standard Serial Number (ISSN)

  • 0556-2813

Citation Source

  • Scopus