Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Linear Sigma Model at Work: Succesful Postdictions for Pion
  Scattering   We enforce chiral Ward identities on the vertices of the linear sigma model
to take into account the width of the scalar sigma, considered as a true
physical resonance. We consider pion scattering at very low energies and, from
a fit to the measured phase shifts in the various angular momentum and isospin
channels, conclude a mass for the sigma of 600+200-100 MeV. Its width turns out
to be of the same size.

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The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
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The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio