Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Light-Meson Two-Photon Decays in Full QCD   We present a study of two-photon decays of light mesons, focusing on the
neutral pion decay. This important process highlights the effects of the axial
anomaly in QCD but has been little studied on the lattice. By applying the
Lehmann-Symanzik-Zimmermann (LSZ) reduction formula, we reconstruct the
electromagnetic matrix elements from three-point vector-vector Green functions
calculated on 2+1-flavor isotropic clover lattices.

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The categories of this paper are: mtrl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: supr-con
23
The categories of this paper are: solv-int
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The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc