Elliptic flow of gluon matter in ultrarelativistic heavy-ion collisions

Details Elliptic flow of gluon matter in ultrarelativistic heavy-ion collisions Elliptic flow of gluon matter in ultrarelativistic heavy-ion collisions

2008-11-18

arxiv.org/abs/0811.2940v3

Phys.Rev.C79:014904,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

20 pages, 7 figures, minor corrections, published version

Scientific paper

10.1103/PhysRevC.79.014904

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.

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