Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anisotropic flow of charged hadrons, pions and (anti-)protons measured
  at high transverse momentum in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=2.76$
  TeV
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
31
The categories of this paper are: ao-sci
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas