Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Chiral Dynamics and Dubna-Mainz-Taipei Dynamical Model for
  Pion-Photoproduction Reaction   We demonstrate that the Dubna-Mainz-Taipei (DMT) meson-exchange dynamical
model, which starts from an effective chiral Lagrangian, for pion
photoproduction provides an excellent and economic framework to describe both
the pi^0 threshold production and the Delta deformation, two features dictated
by chiral dynamics.

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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: supr-con
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: funct-an
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom