Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Partial decay widths of baryons in the spin-momentum operator expansion
  method   The covariant operator expansion method used by the Bonn-Gatchina group for
the analysis of the meson photoproduction data is extended on the case of meson
electro-production reactions. The angular dependence of the partial waves is
deduced and the obtained amplitudes are compared with those used in other
analyses of the electro-production reactions

18
The categories of this paper are: econ
8
The categories of this paper are: hep-ex
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
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The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
15
The categories of this paper are: nucl-ex
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The categories of this paper are: chao-dyn
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin