Abstract
We will review recent results on a quantitative description of global properties of bulk partonic matter at the RHIC. These results include a strangeness phase space occupancy factor of the partonic matter, azimuthal angular anisotropy v2 and transverse momentum pT distributions of effective partons at the hadronization of bulk partonic matter. We present empirical constraints on parton energy loss in the high pT region (>5 GeV/c). A flat RAA as a function of pT at mid-rapidity implies a constant fraction of the parton energy loss (ΔpT/pT) and the fraction reaches 25% for neutral π, charged hadrons and non-photonic electrons of heavy-quark decays from central Au+Au collisions at 200 GeV. Collision centrality dependence of ΔpT/pT from Au+Au and Cu+Cu collisions indicates that the fraction is approximately proportional to particle rapidity density dn/dy divided by the initial transverse overlapping area of the colliding nuclei. Implications on dynamics of parton energy loss will be discussed.
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