What are the degrees of freedom in the partonic fluid at RHIC ?

Details What are the degrees of freedom in the partonic fluid at RHIC ? What are the degrees of freedom in the partonic fluid at RHIC ?

2007-09-27

arxiv.org/abs/0709.4454v1

PoSCPOD07:015,2007

Physics

Nuclear Physics

Nuclear Experiment

9 pages, 8 figures, Proceedings for the 4th International Workshop on Critical Point and Deconfinement, GSI, Darmstadt, German

Scientific paper

Recent RHIC data show evidence of multiple hadron production mechanisms in heavy ion collisions compared to simple fragmentation in vacuum. I will review the measurements of collective flow, high momentum quenching, and two particle angular correlations to show that neither thermal production nor string fragmentation can describe the abundances, the angular distributions or the kinematic properties of all hadrons produced at RHIC. The proposed new hadronization mechanisms not only serve as evidence for a deconfined partonic phase of matter, but also for strong coupling of the degrees of freedom in the deconfined phase. I will point out a surprising lack of flavor dependence in these properties at RHIC, though, which might have to lead to further revisions of our understanding of the relevant degrees of freedom in the partonic phase and during the hadronization process.

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