Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 20: Theory III

HK 20.10: Vortrag

Dienstag, 9. März 2004, 18:15–18:30, E

Suppression of high transverse momentum particles at RHIC by (pre–)hadronic FSI — •Kai Gallmeister, Wolfgang Cassing, and Carsten Greiner* — Institut für Theoretische Physik, Universität Giessen, 35392 Giessen, Germany (* present address: Institut für Theoretische Physik, Universität Frankfurt, 60054 Frankfurt am Main, Germany)

We investigate transverse hadron spectra from proton+proton, deuteron+Au and Au+Au collisions at √s = 200 GeV within the Hadron–String–Dynamics (HSD) approach which is based on quark, diquark, string and hadronic degrees of freedom, combined with Pythia calculations for high p_⊥ spectra. The comparison to experimental data from RHIC shows that pre–hadronic effects of the leading hadrons can be responsible for both the hardening of the spectra for low transverse momenta as well as the suppression of high p_⊥ hadrons. The interactions of formed, non–leading hadrons are found to be more or less negligible for p_⊥≥ 8 GeV/c and cannot be responsible for the large suppression seen experimentally, but they have some importance for lower p_⊥ values. These findings are in nice agreement with the hadron attenuation observed in virtual photon induced reactions on nuclei at HERMES, cf. Thomas Falter’s talk.
Work supported by BMBF.