Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: \gamma*\gamma \rightarrow \pi^0 transition form factor at low-energies
  from a model-independent approach   The recent measured \gamma*\gamma \rightarrow \pi^0 transition form factor in
the space-like region by the Belle Collaboration together with the previous
published results by CLEO, CELLO and BABAR collaborations are analyzed using
the mathematical theory of Pad\'e Approximants which provides a good and
systematic description of the low energy region exemplified here with the
extraction of the slope a_{\pi} and curvature b_{\pi} of the form factor in a
model-independent way. The impact of them on the pion exchange contribution to
the hadronic light-by-light scattering part of the anomalous magnetic moment
a_{\mu} is also discussed.

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The categories of this paper are: math
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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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: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: nlin
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The categories of this paper are: physics
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The categories of this paper are: cond-mat
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: cs