PHENIX Measurements of Azimuthal Anisotropy for ${\pi }^0$ Production at High $p_T$ in Au+Au Collisions at $\sqrt{s_{NN}}=200$GeV

Abstract

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.

4 pages, 4 figures, 21st International Conference On Ultra-Relativistic Nucleus-Nucleus Collisions (QM2009) 30 Mar - 4 Apr 2009, Knoxville, Tennessee

References in corpus (6)

• Calculating the Jet Quenching Parameter from AdS/CFT
• Systematic Comparison of Jet Energy-Loss Schemes in a realistic hydrodynamic medium
• Angular Dependence of Jet Quenching Indicates Its Strong Enhancement Near the QCD Phase Transition
• Gluon energy loss in the gauge-string duality
• A Detailed Study of High-pT Neutral Pion Suppression and Azimuthal Anisotropy in Au+Au Collisions at \sqrt{s_{NN}} = 200 GeV
• Universal upper bound on the energy of a parton escaping from the strongly coupled quark-gluon matter

Cited by in corpus (6)

• The Surprising Transparency of the sQGP at LHC
• Trends in Yield and Azimuthal Shape Modification in Dihadron Correlations in Relativistic Heavy Ion Collisions
• Dissecting the role of initial collision geometry for jet quenching observables in relativistic heavy ion collisions
• Hard Probe of Geometry and Fluctuations in Heavy Ion Collisions at $\sqrt{s_{{}_{NN}}}=$ 0.2, 2.76, and 5.5 TeV
• Qualitative and Quantitative Energy Loss?
• Jet Medium interactions at Quark Matter 09