Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-11-09
Phys.Rev.C75:031902,2007
Physics
Nuclear Physics
Nuclear Theory
5 pages, 6 figures, revised version with minor modifications
Scientific paper
10.1103/PhysRevC.75.031902
We study the radiative energy loss of hard partons in a soft medium in the multiple soft scattering approximation. The soft medium is described by a 3D hydrodynamical model and we treat the averaging over all possible parton paths through the medium without approximation. While the nuclear suppression factor $R_{AA}$ does not reflect the high quality of the medium description (except in a reduced systematic uncertainty in extracting the quenching power of the medium), the hydrodynamical model also allows to study different centralities and in particular the angular variation of $R_{AA}$ with respect to the reaction plane, allowing for a controlled variation of the in-medium path-length. We study the angular dependence of $R_{AA}$ for different centralities, discuss the influence of hydrodynamical expansion and flow and comment on the comparison with preliminary data.
Bass Steffen A.
Nonaka Chiho
Renk Thorsten
Ruppert Joerg
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