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HK: Physik der Hadronen und Kerne

HK 27: Heavy Ions III

HK 27.1: Gruppenbericht

Mittwoch, 13. März 2002, 10:45–11:15, E

Particle flow at RHIC — •Christian Fuchs, Amand Faessler, Eugene Zabrodin, and Larissa Bravina — Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany

We investigate directed (v₁) and elliptic flow (v₂) of hadrons in heavy ion collisions at RHIC energies, i.e. at √s = 130 and 200 AGeV. The microscopic quark-gluon string model (QGSM) is used. Available data on the elliptic flow from the STAR Collaboration [1] are well described by this approach, in particular the p_t dependence of v₂ is reproduced also at high p_t where hydrodynamical models usually fail [2]. The origin of the elliptic flow within the QGSM model is discussed and predictions for v₁ are given. The success of the QGSM model for the description of the elliptic flow is thereby due to the variety of string excitations included in that model. We further present predictions for the flow of negatively and positively charged kaons at SPS and RHIC. Here the change in the flow pattern reflects in a clear way the transition from baryon to meson dominated matter when going from SPS to RHIC energies.

[1] K.H. Ackermann et al., STAR Collab., Phys. Rev. Lett. 86 (2001) 402

[2] E. Zabrodin, C. Fuchs, L. Bravina, A. Faessler, Phys. Lett. B508 (2001) 184