Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analytic Calculation of Prompt Photon plus Associated Heavy Flavor at
  Next-to-Leading Order in QCD   Contributions through second order, $O(\alpha ^2_s)$, in perturbative quantum
chromodynamics are calculated analytically for inclusive associated production
of a prompt photon and a charm quark at large values of transverse momentum in
high energy hadron-hadron collisions. Seven partonic subprocesses contribute at
order $\alpha^2_s$. We find important corrections to the lowest order,
$O(\alpha_s)$, subprocess $c g \rightarrow \gamma c$. We demonstrate to what
extent data from $p +\bar{p}\rightarrow \gamma + c + X$ may serve to measure
the charm quark density in the nucleon.

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The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
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The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
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: q-fin
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The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
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The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin