Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Influence of the re-scattering process on polarization observables in
  reaction gamma + d --> p + p + pi- in Delta - resonance region   Influence of the effects of the pion-nucleon and nucleon-nucleon
re-scattering on the polarization observables of the reaction gamma + d = p + p
+ pi- in Delta - isobar region is investigated. Pion-nucleon and
nucleon-nucleon re-scattering are studied in the diagrammatic approach.
Relativistic-invariant forms of the pion photoproduction and pion-nucleon
scattering operators are used. The unitarization procedure in K-matrix approach
is applied for the resonance partial amplitudes. It is shown a considerable
influence of the re-scattering effects on the polarization observables of this
reaction in the Delta - resonance region for the large momenta of the final
protons.

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The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: econ
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The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: stat
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The categories of this paper are: cs
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an