Darmstadt 2008 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 39: Physik mit schweren Ionen
HK 39.1: Gruppenbericht
Donnerstag, 13. März 2008, 16:30–17:00, 2E
Interaction of charmonia with pre-hadrons in heavy-ion collisions at relativistic energies — •Olena Linnyk1, Elena Bratkovskaya1, Wolfgang Cassing2, and Horst Stöcker1 — 1Frankfurt Institute for Advanced Studies, 60438 Frankfurt am Main, Germany — 2Institut für Theoretische Physik, Universität Giessen, 35392 Giessen, Germany
Applying the Hadron-String Dynamics (HSD) transport approach to charmonium dynamics, we show that the suppression pattern seen at RHIC is reproduced, if elastic interaction of the c c with the pre-hadronic medium is assumed. In particular, the ratio of forward to mid-rapidity nuclear modification factors of J/Ψ (RAAforward (J/Ψ) / RAAmid (J/Ψ)) and the strong elliptic flow of D-mesons, which could not be described by the interaction with comoving mesons or by color screening mechanism, are now explained. Predictions for the Ψ′ survival probabilities and the ratio ⟨ J/Ψ ⟩ / ⟨ π ⟩ at RHIC are performed in the different scenarios as independent observables. Additionally, we present excitation functions for several charmonium observables that show a dramatic change in case of a phase transition to a partonic medium. We further demonstrate that the elliptic flow v2 of J/Ψ is sensitive to the mechanism and the strength of the interaction in the hot and dense (pre-hadronic) phase.