Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 19: Theorie

HK 19.2: Gruppenbericht

Montag, 7. März 2005, 14:30–15:00, TU MA005

Hadron attenuation by (pre-)hadronic FSI at HERMES and RHIC — •Thomas Falter, Wolfgang Cassing, Kai Gallmeister und Ulrich Mosel — Institut für Theoretische Physik, Universität Giessen, Germany

We investigate the relation between the hadron attenuation in deep inelastic electron-nucleus scattering (DIS) at HERMES and the observed quenching of high p_T-jets in ultra-relativistic heavy-ion collisions at RHIC. Our transport theoretical approach [1,2] allows for a realistic coupled-channel treatment of the final state interactions (FSI) that goes far beyond the usual Glauber approach. The nuclear DIS data provides us with essential information on the space-time picture of the hadronization process which turns out to be important for the interpretation of jet quenching in ultrarelativistic heavy-ion collisions as a signature for the quark-gluon plasma. We find that (pre-)hadronic FSI play the dominant role for the observed hadron attenuation at HERMES while they cannot fully explain the situation at most central heavy-ion collisions at RHIC. Work supported by BMBF.

[1] T. Falter, W. Cassing, K. Gallmeister, and U. Mosel, Phys. Lett. B 594, 61 (2004); Phys. Rev. C (in press), nucl-th/0406023.

[2] W. Cassing, K. Gallmeister, and C. Greiner, Nucl. Phys. A 735, 277 (2004); K. Gallmeister and W. Cassing, Nucl. Phys. A (in press), hep-ph/0408223.