Quantifying Properties of the QCD Matter at RHIC

Abstract

We will review recent results on quantitative description of global properties of bulk partonic matter at RHIC. These results include strangeness phase space factor of the partonic matter, azimuthal angular anisotropy $v_2$, and transverse momentum $p_T$ distributions of effective partons at the hadronization of bulk partonic matter. We present empirical constraints on parton energy loss in the high $p_T$ region ($>$ 5 GeV/c). A flat $R_{AA}$ as a function of $p_T$ at mid-rapidity implies a constant fraction of the parton energy loss ($\Delta p_T/p_T$) and the fraction reaches 25% for neutral $\pi$, charged hadrons and non-photonic electrons of heavy quark decays from central Au+Au collisions at $\sqrt{s_{NN}}$ 200 GeV. Collision centrality dependence of $\Delta p_T/p_T$ 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.

To Appear in SQM2008 Conference Proceedings

References in corpus (12)

• Scaling properties of azimuthal anisotropy in Au+Au and Cu+Cu collisions at sqrt(s_NN) = 200 GeV
• Partonic flow and $\varphi$-meson production in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV
• Systematic Comparison of Jet Energy-Loss Schemes in a realistic hydrodynamic medium
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• Angular variation of hard back-to-back hadron suppression in heavy-ion collisions
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• The first measurement of $B$ meson semi-leptonic decay contribution to non-photonic electrons at RHIC
• Hadron Resonances and Phase Threshold in Heavy Ion Collisions
• Empirical Constraints on Parton Energy Loss in Nucleus-Nucleus Collisions at RHIC

Cited by in corpus (2)

• Scaling of Elliptic Flow, Recombination and Sequential Freeze-Out of Hadrons in Heavy-Ion Collisions
• Extracting strange quark freeze-out information in Pb+Pb collisions at $\sqrt{s_{NN}}$=2.76 TeV from $\varphi$ and $\Omega$ production