Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Resurrection of the Sigma Meson   It is shown from a very general model and an analysis of data on the lightest
0++ meson nonet that the f0(980) and f0(1200) resonance poles are two
manifestations of the same ss state. Similarily the a0(980) and the a0(1450)
are likely to be two manifestations of the same qq state. On the other hand,
the uu+dd state, when unitarized and strongly distorted by hadronic mass
shifts, becomes an extremely broad Breit-Wigner-like background, m=860 MeV,
Gamma=880 MeV, with its pole at s=(0.158-i0.235) GeV^2. This we identify with
the sigma meson required by models for spontaneous breaking of chiral symmetry.

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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
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The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: dg-ga