Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2009-06-30
Nucl.Phys.A830:175c-178c,2009
Physics
Nuclear Physics
Nuclear Experiment
4 pages, 4 figures, 21st International Conference On Ultra-Relativistic Nucleus-Nucleus Collisions (QM2009) 30 Mar - 4 Apr 200
Scientific paper
10.1016/j.nuclphysa.2009.10.092
An improved measurement of $v_2$ for $\pi^0$ in a broad range of $p_T$ and centrality is presented. By combining $v_2$ with the $R_{AA}$, we provide new insights on jet-medium interactions. We show that current pQCD energy loss models cannot describe the suppression of the $\pi^0$ as a function of the angle with respect to the reaction plane. Our result could help to resolve the factor of 4 differences in the predicted transport coefficients among these models. Alternatively, it may suggest that non-perturbative effects associated with the strongly coupled QGP are important, and new theoretical developments are needed to fully understand the jet medium interactions.
for the PHENIX Collaboration
Wei Rui
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