Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the centrality and pseudorapidity dependence of the
  integrated elliptic flow in lead-lead collisions at sqrt(s_NN)=2.76 TeV with
  the ATLAS detector   The integrated elliptic flow of charged particles produced in Pb+Pb
collisions at sqrt(s_NN)=2.76 TeV has been measured with the ATLAS detector
using data collected at the Large Hadron Collider. The anisotropy parameter,
v_2, was measured in the pseudorapidity range |eta| <= 2.5 with the event-plane
method. In order to include tracks with very low transverse momentum pT, thus
reducing the uncertainty in v_2 integrated over pT, a 1 mu b-1 data sample
without a magnetic field in the tracking detectors is used. The centrality
dependence of the integrated v_2 is compared to other measurements obtained
with higher pT thresholds. A weak pseudorapidity dependence of the integrated
elliptic flow is observed for central collisions, and a small decrease when
moving away from mid-rapidity is observed only in peripheral collisions. The
integrated v2 transformed to the rest frame of one of the colliding nuclei is
compared to the lower-energy RHIC data.

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The categories of this paper are: physics
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: econ
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The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
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The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: cs
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph