Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Elliptic flow at high transverse momentum in Pb-Pb collisions at
  $\sqrt{s_{NN}} = 2.76$ TeV with the ALICE experiment   An observable that can be used to better constrain the mechanism responsible
for the parton energy loss is the elliptic azimuthal event anisotropy, $v_2$.
We report on measurements of $v_2$ for inclusive and identified charged
particles in Pb-Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV recorded by the
ALICE experiment at the LHC. $v_2$ is presented for a wide range of particle
transverse momentum up to $p_T=20$ GeV/c. The particle $v_2$ is finite,
positive and approximately constant for $p_T>8$ GeV/c. The proton $v_2$ is
higher than that of the pion up to about $p_T=8$ GeV/c. The results are
compared to the measurements at lower energy reported by RHIC experiments.

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The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
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The categories of this paper are: eess