Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-12-12
Phys.Lett.B500:232-240,2001
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages incl. 5 figures; submitted to Physics Letters B; Ref. 4 and a few typos corrected; no changes in contents
Scientific paper
10.1016/S0370-2693(01)00079-X
Anisotropic transverse flow is studied in Pb+Pb and Au+Au collisions at SPS and RHIC energies. The centrality and transverse momentum dependence at midrapidity of the elliptic flow coefficient v_2 is calculated in the hydrodynamic and low density limits. Hydrodynamics is found to agree well with the RHIC data for semicentral collisions up to transverse momenta of 1-1.5 GeV/c, but it considerably overestimates the measured elliptic flow at SPS energies. The low density limit LDL is inconsistent with the measured magnitude of v_2 at RHIC energies and with the shape of its p_t-dependence at both RHIC and SPS energies. The success of the hydrodynamic model points to very rapid thermalization in Au+Au collisions at RHIC and provides a serious challenge for kinetic approaches based on classical scattering of on-shell particles.
Heinz Ulrich
Heiselberg Henning
Huovinen Pasi
Kolb Peter F.
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