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.
Copyright Owner
American Physical Society
Copyright Date
2010
Language
en
File Format
application/pdf
Recommended Citation
Adare, Andrew; Hill, John C.; Kempel, Todd; Lajoie, John G.; Lebedev, Alexandre; Ogilvie, Craig; Pei, H.; Rosati, Marzia; Semenov, Alexey Yu.; Vale, Carla; Wei, Feng; et al.; and PHENIX Collaboration, "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" (2010). Physics and Astronomy Publications. 319.
https://lib.dr.iastate.edu/physastro_pubs/319
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.