Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Jet-quenching in a 3D hydrodynamic medium   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.

10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int