Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2008-01-28
Nucl.Phys.A807:79-104,2008
Physics
Nuclear Physics
Nuclear Theory
35 pages, 16 Figs, v2: additional figure and corresponding changes to the text
Scientific paper
10.1016/j.nuclphysa.2008.03.016
Within the Hadron-String Dynamics (HSD) transport approach we study the suppression pattern of charmonia at RHIC with respect to centrality and rapidity employing various model concepts such as variants of the 'comover absorption' model or the 'charmonium melting' scenario. We find that especially the ratio of the forward to mid-rapidity nuclear modification factors of J/Psi (R_AA (forward) / R_AA (mid)) cannot be explained by the interactions with 'formed' comoving mesons or by the 'color screening mechanism' alone. Only when incorporating interactions of the c or c-bar quark with a pre-hadronic medium satisfactory results are obtained. A detailed comparison to the PHENIX data demonstrates that non-hadronic interactions are mandatory to describe the narrowing of the J/Psi rapidity distribution from p+p to central Au+Au collisions. The Psi' to J/Psi ratio is found to be crucial in disentangling the different charmonium absorption scenarios especially in the RHIC energy range. Furthermore, a comparison of the transport calculations to the statistical model of Gorenstein and Gazdzicki as well as the statistical hadronization model of Andronic et al. shows differences in the energy dependence as well as centrality dependence of the J/Psi to pion ratio which may be exploited experimentally to disentangle different concepts. We find additionally that the collective flow of charm in the HSD transport appears compatible with the data at SPS energies but substantially underestimates the data at top RHIC energies such that the large elliptic flow v_2 of charm seen experimentally has to be attributed to early interactions of non-hadronic degrees of freedom.
Bratkovskaya Elena L.
Cassing Wolfgang
Linnyk Olena
No associations
LandOfFree
Evidence for non-hadronic interactions of charm degrees of freedom in heavy-ion collisions at relativistic energies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Evidence for non-hadronic interactions of charm degrees of freedom in heavy-ion collisions at relativistic energies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evidence for non-hadronic interactions of charm degrees of freedom in heavy-ion collisions at relativistic energies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-156954