Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The large-Nc masses of light scalar mesons from QCD sum rules for linear
  radial spectrum   We discuss a calculation of large-Nc masses of light scalar mesons from the
QCD sum rules. Two methods based on the use of linear radial Regge trajectories
are presented. We put a special emphasis on the appearance of pole near 0.5 GeV
in the scalar isoscalar channel which emerges in both methods and presumably
corresponds to the scalar sigma-meson.

30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
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The categories of this paper are: comp-gas
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The categories of this paper are: bayes-an
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex