Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analyticity and sum rules for photon GPDs   The photon is explored as an object to test the applications of QCD to the
perturbatively calculable collinear parton distributions. We investigate
analytic properties of DVCS amplitudes and related sum rules of generalized
parton distributions of the photon using as an input their earlier calculations
in the leading order. The relation of these GPDs to the quintessential
functions in the framework of the dual parametrization approach is also found.

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The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: eess
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The categories of this paper are: econ
17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
15
The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
3
The categories of this paper are: physics
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: funct-an
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The categories of this paper are: hep-ex