Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pseudoscalar pole terms in the hadronic light-by-light scattering
  contribution to muon $ g - 2 $   The pseudoscalar pole contribution is the dominant source of the $ {\cal
O}(\alpha^3) $ hadronic light-by-light scattering effect in muon $g - 2$.
  We have examined this contribution taking account of the off-shell structure
of the pseudoscalar-photon-photon anomaly vertex deduced from available
experimental data.
  Our work leads to an improved estimate, $ -79.2 (15.4) \times 10^{-11}$, for
the total hadronic light-by-light scattering contribution to the muon $g - 2$.

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The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: cmp-lg
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: q-fin
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The categories of this paper are: math
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The categories of this paper are: nucl-th
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom