Two RHIC puzzles: Early thermalization and the HBT problem

Details Two RHIC puzzles: Early thermalization and the HBT problem Two RHIC puzzles: Early thermalization and the HBT problem

2002-04-04

arxiv.org/abs/hep-ph/0204061v1

Proc. 18th Winter Workshop on Nuclear Dynamics (R. Bellwied, J. Harris, and W. Bauer, eds.), pp. 205-216, EP Systema, Debrecen

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, including 6 figures. Talk given at the 18th Winter Workshop on Nuclear Dynamics, Nassau, Bahamas, Jan 20-27, 2002 [t

Scientific paper

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.

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