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

Jiechen Xu; Alessandro Buzzatti; Miklos Gyulassy

doi:10.1016/j.nuclphysa.2014.07.027

paper

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

arXiv:1404.0384 · doi:10.1016/j.nuclphysa.2014.07.027

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 $p_{T}$ flow data constrained medium which has 2+1D viscous hydrodynamical expanding profile. We find that in CUJET2.0, with only one control parameter, $α_{ma x}$ , the maximum coupling strength, fixed to be 0.26, the computed nuclear modification factor $R_{AA}$ in central and semi-peripheral AA collisions are consistent with RHIC and LHC data at average $χ^{2} / d . o . f . < 1.5$ level. Simultaneous agreements with high $p_{T}$ azimuthal anisotropy $v_{2}$ data are acquired given average $α_{ma x}$ over in-plane and out-of-plane paths varying as little as 10\%, suggesting a non-trivial dependence of the high $p_{T}$ single particle $v_{2}$ on the azimuthally varied strong coupling.

5 pages, 2 figures, elsarticle style; contributed talk by Jiechen Xu at Hard Probes 2013, Cape Town; version published in Nucl. Phys. A

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

Abstract

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