Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Prompt Photon Production in $\gamma \gamma$ Collisions and the Gluon
  Content of the Photon   We calculate the cross section for inclusive prompt photon production in
$\gamma\gamma$ collisions, i.e. the reaction $e^+e^-\to \gamma \gamma \to
\gamma X$, in next-to-leading order QCD. We show that at LEP2 energies this
cross section is measurable and is sensitive to the gluon distribution of the
photon, $g^{\gamma}$, which is currently very poorly constrained by data.

23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
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The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th