Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct photon and light neutral meson production in the era of precision
  physics at the LHC   In these proceedings we present the latest results from ALICE on direct
photon and light neutral meson production in p$-$Pb and Pb$-$Pb collisions. The
direct photon excess ratio $R_{\gamma}$ in different charged particle
multiplicity classes of p$-$Pb collisions at
$\sqrt{s_{{\tiny{NN}}}}=5.02\,\mathrm{TeV}$ is shown. In addition, we present
the direct photon elliptic flow coefficient $v_2$ in central and semicentral
events of Pb$-$Pb collisions at $\sqrt{s_{{\tiny{NN}}}}=2.76\,\mathrm{TeV}$. An
outlook on ongoing and future measurements is given.

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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
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The categories of this paper are: ao-sci
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: q-fin
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph