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Elliptic flow at SPS and RHIC: from kinetic transport to hydrodynamics |
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| Authors: | P F Kolb P Huovinen U Heinz H Heiselberg |
| Institution: | a Theoretical Physics Division, CERN, CH-1211 Geneva 23, Switzerland b Institut für Theoretische Physik, Universität Regensburg, D-93040 Regensburg, Germany c Department of Physics, The Ohio State University, 174 West 18th Ave., Columbus, OH 43210, USA d Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA e NORDITA, Blegdamsvej 17, DK-2100 Copenhagen Ø, Denmark |
| Abstract: | 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 v2 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 v2 at RHIC energies and with the shape of its pt-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. |
| Keywords: | Relativistic heavy-ion collisions Elliptic flow |
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