Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Suppression of neutral pion production at large transverse momentum
  measured with the ALICE experiment in Pb-Pb collisions at
  $\sqrt{s_{NN}}=2.76$ TeV   The ALICE collaboration at the LHC has measured the transverse momentum
spectra of neutral pions via their two photon decay in pp and Pb$-$Pb
collisions at $\sqrt{s_{NN}}=2.76$ TeV over a broad transverse momentum range
with different subsystems: with the electromagnetic calorimeters PHOS and EMCAL
and with photon conversions in the inner material of the detectors using
$e^{+}e^{-}$ pairs reconstructed with the Central Tracking System. In this
report, neutral pions production is compared between pp and Pb$-$Pb collisions
measured with conversion photons in terms of the nuclear modification factor,
$R_{AA}$, for different centrality selections of the Pb$-$Pb data sample.

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The categories of this paper are: econ
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The categories of this paper are: stat
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: math
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The categories of this paper are: hep-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: nlin
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex