Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How Universal is the Coupling in the Sigma Model?   We calculate pion-pion scattering lengths and sigma, rho and a1 decay widths
from a gauged linear sigma model with two flavours and its globally invariant
generalisation.

24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
17
The categories of this paper are: q-fin
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat