Campus Units

Physics and Astronomy

Document Type

Article

Publication Version

Published Version

Publication Date

9-27-2010

Journal or Book Title

Physical Review Letters

Volume

105

Issue

14

First Page

142301

DOI

10.1103/PhysRevLett.105.142301

Abstract

We have measured the azimuthal anisotropy of pi(0) production for 1 < p(T) < 18 GeV/c for Au + Au collisions at root s(NN) = 200 GeV. The observed anisotropy shows a gradual decrease for 3 less than or similar to p(T) less than or similar to 7-10 GeV/c, but remains positive beyond 10 GeV/c. The magnitude of this anisotropy is underpredicted, up to at least similar to 10 GeV/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.

Comments

This article is published as Adare, A., S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, H. Al-Bataineh, J. Alexander et al. "Azimuthal Anisotropy of π 0 Production in Au+ Au Collisions at s N N= 200 GeV: Path-Length Dependence of Jet Quenching and the Role of Initial Geometry." Physical review letters 105, no. 14 (2010): 142301. DOI:10.1103/PhysRevLett.105.142301. Posted with permission.

Copyright Owner

American Physical Society

Language

en

File Format

application/pdf

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