Azimuthal Anisotropy of π0 Production in Au+Au Collisions at sNN=200GeV: Path-Length Dependence of Jet Quenching and the Role of Initial Geometry

A. Adare et al. (PHENIX Collaboration)
Phys. Rev. Lett. 105, 142301 – Published 27 September 2010

Abstract

We have measured the azimuthal anisotropy of π0 production for 1<pT<18GeV/c for Au+Au collisions at sNN=200GeV. The observed anisotropy shows a gradual decrease for 3pT710GeV/c, but remains positive beyond 10GeV/c. The magnitude of this anisotropy is underpredicted, up to at least 10GeV/c, by current perturbative QCD (PQCD) energy-loss model calculations. An estimate of the increase in anisotropy expected from initial-geometry modification due to gluon saturation effects and fluctuations is insufficient to account for this discrepancy. Calculations that implement a path-length dependence steeper than what is implied by current PQCD energy-loss models show reasonable agreement with the data.

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  • Received 18 June 2010

DOI:https://doi.org/10.1103/PhysRevLett.105.142301

© 2010 The American Physical Society

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Vol. 105, Iss. 14 — 1 October 2010

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