Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-11-29
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, 5 figures, to appear in the Proceedings of the XL International Symposium on Multiparticle Dynamics (ISMD 2010), 21-2
Scientific paper
The hydrodynamic (hydro) model applied to data from the relativistic heavy ion collider (RHIC) suggests that a dense QCD medium opaque to partons is formed in more-central Au-Au collisions. However, two-component spectrum analysis reveals a hard component, consistent with parton fragmentation described by pQCD, which can masquerade as "radial flow." Minimum-bias angular correlations reveal that most scattered partons survive as "minijets" even in central Au-Au collisions. Such alternative methods quantitatively describe spectrum and correlation structure via pQCD calculations. RHIC collisions appear to be dominated by parton scattering and fragmentation even in central Au-Au collisions.
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