Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..apr.c4004k&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
A wealth of low pT observables has been extracted from RHIC's year 2000 run with Au nuclei colliding at energies of 130 GeV per nucleon [1]. We summarize the indications given by the experimental particle spectra, their slope parameters, and anisotropies in the case of non-central collisions (elliptic flow), which suggest that the amount of transverse flow at RHIC is strongly increased compared to experiments at lower beam energies. In fact, we find that rescattering in the created fireball is strong enough that flow observables coincide with results given by an ideal hydrodynamic expansion [2]. This indicates that local thermal equilibrium is established at very short timescales after the collision with temperatures reaching well above the predicted QCD phase transition temperature - even in non-central collisions. We discuss the limitations and shortcomings of the idealized approach and give an outlook and expectations for results from the recent run at 200 AGeV. References: [1] Proceedings of 15th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, 2001, Nucl. Phys. A, in press; Publications by the BRAHMS-, PHENIX-, PHOBOS-, and STAR-Collaborations. [2] P.F. Kolb et al., PLB 500 (2001) 232; P. Huovinen et al., PLB 503 (2001) 58; P.F. Kolb et al., NPA 696 (2001) 197.
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