Azimuthal Anisotropy of pi(0) Production in Au plus Au Collisions at root s(NN)=200 GeV: Path-Length Dependence of Jet Quenching and the Role of Initial Geometry

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2010-09-27
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Adare, Andrew
Hill, John
Ogilvie, Craig
Kempel, Todd
Lajoie, John
Lebedev, Alexandre
Ogilvie, Craig
Pei, H.
Rosati, Marzia
Semenov, Alexey
Vale, Carla
Wei, Feng
et al.
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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.

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<p>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." <em>Physical review letters</em> 105, no. 14 (2010): 142301. DOI:<a href="http://dx.doi.org/10.1103/PhysRevLett.105.142301" target="_blank">10.1103/PhysRevLett.105.142301</a>. Posted with permission.</p>
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