Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $FSI$ Corrections For Near Threshold Meson Production In Nucleon-Nucleon
  Collisions   A procedure is proposed which accounts for final state interaction
corrections for near threshold meson production in nucleon-nucleon scattering.
In analogy with the Watson-Migdal approximation, it is shown that in the limit
of extremely strong final state effects, the amplitude factorizes into a
primary production amplitude and an elastic scattering amplitude describing a
$3 \to 3$ transition. This amplitude determines the energy dependence of the
reaction cross section near the reaction threshold almost solely. The
approximation proposed satisfies the Fermi-Watson theorem and the coherence
formalism. Application of this procedure to meson production in nucleon-nucleon
scattering shows that, while corrections due to the meson-nucleon interaction
are small for s-wave pion production, they are crucial for reproducing the
energy dependence of the $\eta$ production cross section.

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The categories of this paper are: gr-qc
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The categories of this paper are: nlin
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The categories of this paper are: math-ph
3
The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
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The categories of this paper are: cond-mat
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The categories of this paper are: q-bio
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The categories of this paper are: funct-an
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-ex
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The categories of this paper are: plasm-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: q-fin