Berlin 2005 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 18: Physik mit schweren Ionen
HK 18.3: Gruppenbericht
Montag, 7. März 2005, 14:45–15:15, TU MA041
Anisotropic Flow of Charged Hadrons for Au+Au Collisions at RHIC — •Gerhard Burau1, Johannes Bleibel1, Christian Fuchs1, Amand Fässler1, Larissa Bravina2, and Eugene Zabrodin3 — 1Institute for Theoretical Physics, University of Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen — 2Department of Physics, University of Oslo, N-0316 Oslo — 3Centre of Mathematics for Applications, University of Oslo, N-0316 Oslo
The pseudorapidity distributions of the azimuthal anisotropy parameters v1(η) and v2(η) of inclusive charged hadrons and their centrality dependence has been studied in Au+Au collisions at full RHIC energy of √s = 200 GeV within the microscopic quark-gluon string model. The QGSM simulation results for the directed flow show qualitatively and quantitatively a good agreement with the v1(η) data measured experimentally at high pseudorapidities, but cannot reproduce the flat behaviour of v1(|η| ≤ 1.3). The η dependence of the elliptic flow v2 exracted from our simulation agrees well in the whole pseudorapidity range for all centrality classes. Furthermore, the transverse momentum dependence of the elliptic flow v2(pT) of identified and inclusive charged hadrons obtained with the QGSM is presented. The QGSM descriptions are rather good at low pT, whereas they underestimate the measured elliptic flow for transverse momenta pT > 1 GeV/c. Nevertheless, they coincide quite well with the qualitative pT behaviour of the experimental data. In particular, the model is able to reproduce the experimental evidence of the crossing of the elliptic flow for mesons and baryons.