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

  • The equilibration of hot and dense nuclear matter produced in the central region in central Au+Au collisions at square root s = 200A GeV 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.

Download full text files

Export metadata

Additional Services

Share in Twitter Search Google Scholar
Author:Larissa BravinaORCiDGND, Eugene E. ZabrodinORCiD, Marcus BleicherORCiDGND, Steffen A. BassORCiDGND, Mathias Brandstetter, Amand FäßlerGND, Christian Fuchs, Walter GreinerGND, Mark I. GorensteinORCiDGND, Sven SoffORCiD, Horst StöckerORCiDGND
ArXiv Id:
Document Type:Preprint
Year of Completion:2000
Date of first Publication:2000/10/26
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2005/04/14
Page Number:5
First Page:1
Last Page:5
Später erschienen in: Journal of physics. G, Nuclear and particle physics, 27.2001, Nr. 3, Art. 421, doi:10.1088/0954-3899/27/3/321
Source: , Talk at the conference Strangeness'2000, to be published in J. of Phys. G
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoDeutsches Urheberrecht