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

Published

Journal Article

The equilibration of hot and dense nuclear matter produced in the central region in central Au + Au collisions at √s = 200 A GeV is studied within the microscopic transport model UrQMD. The pressure here becomes isotropic at t ≈ 5 fm c-1. Within the next 15 fm c-1 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 = 0.15ε. Comparison with the statistical model (SM) of an ideal hadron gas reveals that the time of ≈ 20 fm c-1 may be too short to attain the fully equilibrated state. In particular, the fractions of resonances are overpopulated in contrast with 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.

Full Text

Duke Authors

Cited Authors

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

Published Date

  • March 1, 2001

Published In

Volume / Issue

  • 27 / 3

Start / End Page

  • 421 - 426

International Standard Serial Number (ISSN)

  • 0954-3899

Digital Object Identifier (DOI)

  • 10.1088/0954-3899/27/3/321

Citation Source

  • Scopus