The tricky azimuthal dependence of jet quenching at RHIC and LHC via CUJET2.0

Xu, J. C. and Buzzatti, A. and Gyulassy, Miklós Pál (2014) The tricky azimuthal dependence of jet quenching at RHIC and LHC via CUJET2.0. NUCLEAR PHYSICS A, 932. pp. 128-133. ISSN 0375-9474

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Abstract

High transverse momentum neutral pion and charged hadron suppression pattern with respect to reaction plane at RHIC and LHC energies in central and semi-peripheral AA collisions are studied in a perturbative QCD based model, CUJET2.0. CUJET2.0 has dynamical DGLV radiation kernel and Thoma-Gyulassy elastic energy loss, with both being generalized to including multi-scale running strong coupling as well as energy loss probability fluctuations, and the full jet path integration is performed in a low pT flow data constrained medium which has 2+1D viscous hydrodynamical expanding profile. We find that in CUJET2.0, with only one control parameter, αmax, the maximum coupling strength, fixed to be 0.26, the computed nuclear modification factor RAA in central and semi-peripheral AA collisions are consistent with RHIC and LHC data at average χ2/d.o. f. < 1.5 level. Simultaneous agreements with high pT azimuthal anisotropy v2 data are acquired given average αmax over in-plane and out-of-plane paths varying as little as 10%, suggesting a non-trivial dependence of the high pT single particle v2 on the azimuthally varied strong coupling.

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