Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Das-Mathur-Okubo sum rule for the charged pion polarizability in a
  chiral model   The Das-Mathur-Okubo (DMO) sum rule for the polarizability of charged pions
is evaluated for the Nambu-Jona-Lasinio model Lagrangian in both its minimal
and extended forms. A comparison is made with the results obtained using the
same sum rule from chiral perturbation theory (CHPT), approximate QCD sum rule
calculations, explicit calculations on the lattice by Wilcox, and using the
semi-empirical Kapusta-Shuryak spectral densities. The $\chi$PT results from
Compton scattering are also given. We point to a delicate cancellation between
the intrinsic and recoil contributions to $\alpha_{\pi^\pm}$ in the DMO sum
rule approach that can lead to calculated polarizabilities of either sign.

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The categories of this paper are: nucl-ex
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The categories of this paper are: stat
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: astro-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: solv-int
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The categories of this paper are: gr-qc
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The categories of this paper are: chao-dyn
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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: atom-ph