Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Investigation of light scalar resonances at COSY   The $a_0$(980) and $f_0$(980) resonances are two well established states in
the excited meson spectrum. We review the most prominent theoretical models
which try to explain the structure of these states. It is discussed whether
data from COSY on $a_0$ and $f_0$ production in $pp$, $pn$, $pd$ and $dd$
collisions allow to distinguish between the different approaches. Very
promising in this respect seems to be the measurement of the reaction $dd \to
(\mathrm{^4He} a_0^0 \to) \mathrm{^4He} \pi^0\eta$ which violates isospin
conservation and can be related to $a_0$-$f_0$ mixing.

7
The categories of this paper are: hep-th
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
2
The categories of this paper are: math