Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analysis of Charm Pair Production at the LHC   The DGLAP and CCFM approaches to perturbative QCD evolution have been
investigated by examining correlations of charmed hadron pairs in $pp$
collisions at $\sqrt{s}=7$ TeV. The theoretical models are compared to the data
taken by the LHCb experiment. Differences in the parton kinematics between the
two approaches are discussed. In general a model incorporating NLO diagrams
matched to parton showers describes the data best.

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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-th
34
The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
1
The categories of this paper are: cs
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The categories of this paper are: alg-geom
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The categories of this paper are: acc-phys
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The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph