Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct Photons in p+p, d+Au and Au+Au Collisions at sqrt(s_NN) = 200 GeV   The PHENIX experiment has measured direct photons at $\sqrt{s_{NN}}$ = 200
GeV in $p+p$, $d$+Au and Au+Au collisions. For $p_{T}$ $<$ 4 GeV/$c$, the
internal conversion into $e^{+}e^{-}$ pairs has been used to measure the direct
photons in Au+Au.

36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
2
The categories of this paper are: math