Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Quantitative extraction of the jet transport parameter from combined
  data at RHIC and LHC   Using theoretical tools developed by the JET Collaboration in which one
employes 2+1D or 3+1D hydrodynamic models for the bulk medium evolution and jet
quenching models, the combined data on suppression of single inclusive hadron
spectra at both RHIC and LHC are systematically analyzed with five different
approaches to the parton energy loss. The jet transport parameter is extracted
from the best fits to the data with values of $\hat q \approx 1.2\pm 0.3$ and
$1.9\pm 0.7$ GeV$^2$/fm in the center of the most central Au+Au collisions at
$\sqrt{s}=200$ GeV and Pb+Pb collisions at $\sqrt{s}=2.67$ TeV, respectively at
an initial time $\tau_0=0.6$ fm/$c$ for a quark jet with an initial energy of
10 GeV/$c$.

3
The categories of this paper are: physics
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th