High-pT pi0 Production with Respect to the Reaction Plane in Au + Au Collisions at s(NN)**(1/2) = 200-GeV

The PHENIX collaboration
Phys.Rev.C 80 (2009) 054907, 2009.

Abstract (data abstract)
Measurements of the azimuthal anisotropy of high-$p_T$ neutral pion ($\pi^0$) production in Au+Au collisions at $\sqrt{sNN} = 200$ GeV by the PHENIX experiment are presented. The data included in this paper were collected during the 2004 RHIC running period and represent approximately an order of magnitude increase in the number of analyzed events relative to previously published results. Azimuthal angle distributions of $\pi^0$s detected in the PHENIX electromagnetic calorimeters are measured relative to the reaction plane determined event-by-event using the forward and backward beam-beam counters. Amplitudes of the second Fourier component ($v_2$) of the angular distributions are presented as a function of $\pi^0$ transverse momentum (pT) for different bins in collision centrality. Measured reaction plane dependent $\pi^0$ yields are used to determine the azimuthal dependence of the $\pi^0$ suppression as a function of pT, RAA(∆φ, pT). A jet-quenching motivated geometric analysis is presented that attempts to simultaneously describe the centrality dependence and reaction plane angle dependence of the $\pi^0$ suppression in terms of the path lengths of hypothetical parent partons 3 in the medium. This set of results allows for a detailed examination of the influence of geometry in the collision region, and of the interplay between collective flow and jet-quenching effects along the azimuthal axis.

  • fig4


    $\pi^0 v_2$ as function of centrality. All errors are absolute.

  • fig5


    $\pi^0 v_2$ as function of centrality. All errors are absolute.

  • fig15


    Rebinned $R_{AA}$ for $\Delta \phi$, $p_T$, and path length dependence,

  • RAA vs dphi


    Rebinned $R_{AA}$ for $\Delta \phi$, $p_T$, and path length dependence,

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