Two RHIC puzzles: Early thermalization and the HBT problem
摘要
Hadron spectra from the first year RHIC run are shown to be excellently reproduced by hydrodynamic calculations. We argue that in particular the elliptic flow data provide strong evidence for early thermalization at RHIC, at energy densities well above deconfinement, but that the phenomenologically extracted short thermalization time scale of less than 1 fm/c provides a serious challenge for theory. The HBT radii from the hydrodynamic calculations agree only qualitatively with the data, showing significant quantitative discrepancies. It is argued that this points to a still incomplete understanding of the freeze-out process at RHIC.
引用
@article{arxiv.hep-ph/0204061,
title = {Two RHIC puzzles: Early thermalization and the HBT problem},
author = {Ulrich W. Heinz and Peter F. Kolb},
journal= {arXiv preprint arXiv:hep-ph/0204061},
year = {2007}
}
备注
12 pages, including 6 figures. Talk given at the 18th Winter Workshop on Nuclear Dynamics, Nassau, Bahamas, Jan 20-27, 2002 [to appear in the proceedings (W. Bauer et al., eds.) in Heavy Ion Physics]