Azimuthal anisotropy of π° production in Au+Au collisions at sqrt((s)NN)=200 GeV: path-length dependence of jet quenching and the role of initial geometry.
Phys Rev Lett
; 105(14): 142301, 2010 Oct 01.
Article
em En
| MEDLINE
| ID: mdl-21230825
ABSTRACT
We have measured the azimuthal anisotropy of π° production for 1anisotropy shows a gradual decrease for 3â²p(T)â²7-10 GeV/c, but remains positive beyond 10 GeV/c. The magnitude of this anisotropy is underpredicted, up to at least â¼10 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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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2010
Tipo de documento:
Article
País de afiliação:
Estados Unidos