Elliptic flow of gluon matter in ultrarelativistic heavy-ion collisions

Abstract

Employing a perturbative QCD based parton cascade we calculate the elliptic flow $v_2$ and its transverse momentum dependence $v_2(p_T)$ for the gluon matter created in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV. To make comparisons with the experimental data at the BNL Relativistic Heavy Ion Collider (RHIC), parton-hadron duality is assumed. We find that whereas the integrated $v_2$ matches the experimental data, the gluon (or pion) $v_2(p_T)$ is about 20-50% smaller than the experimental data. Hadronization via gluon fragmentation and quark recombination seems to be the key to explaining the necessary jump of $v_2(p_T)$ from the partonic to the hadronic phase. We also show that the elliptic flow values moderately depend on the chosen freezeout condition, which will thus constrain the shear viscosity to the entropy density ratio of the quark gluon plasma created at RHIC.

20 pages, 7 figures, minor corrections, published version

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• Causal Viscous Hydrodynamics for Relativistic Heavy Ion Collisions
• Heavy quarks at RHIC and LHC within a partonic transport model
• Shear Viscosity in a Perturbative Quark-Gluon-Plasma
• Dependence of elliptic flow on number of parton degrees of freedom
• Mach Cones in Viscous Matter
• Relativistic Shock Waves and Mach Cones in Viscous Gluon Matter