Hadron ratios: Chiral symmetry restauration vs. nonequilibrium quark dynamics
作者:
K. Paech,
M. Bleicher,
S. Scherer,
D. Zschiesche,
H. Sto¨cker,
W. Greiner,
期刊:
AIP Conference Proceedings
(AIP Available online 1901)
卷期:
Volume 597,
issue 1
页码: 45-53
ISSN:0094-243X
年代: 1901
DOI:10.1063/1.1427444
出版商: AIP
数据来源: AIP
摘要:
Hadron production in recent nucleus-nucleus collisions experiments at the SPS and at RHIC have been analyzed in various thermal model fits. Here it is shown that the fit cannot be unique: the chemical freeze-out close to the phase transition to a QGP should be accompanied by shifting baryon masses in medium, which can yield considerably smaller break-up temperatures. Also a simple microscopic quark molecular dynamics model yields hadron ratios in nice agreement with those data. Hence, additional information, e.g., from HBT, is needed to determine the freeze-out parameters from data. ©2001 American Institute of Physics.
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