Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anomalous GPDs in the photon   We consider deeply virtual Compton scattering (DVCS) on a photon target, in
the generalized Bjorken limit, at the Born order and in the leading logarithmic
approximation. This leads us to the extraction of the photon anomalous
generalized parton distributions (GPDs) \cite{url, DVCSphoton}.

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The categories of this paper are: patt-sol
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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: gr-qc
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The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: q-bio
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The categories of this paper are: plasm-ph
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The categories of this paper are: bayes-an