Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Lowest-Lying Scalar Mesons and a Possible Probe of Their Quark
  Substructure   In this talk, an overview of the status of the light scalar mesons in the
context of the non linear chiral Lagrangian of references [1-3] is presented.
The evidence for the existence of a scalar nonet below 1 GeV is reviewed, and
it is shown that by introducing a scalar nonet an indirect way of probing the
quark substructure of these scalars through the scalar mixing angle can be
obtained. It is then reviewed that consistency of this non-linear chiral
Lagrangian framework with the experimental data on pi pi and pi K scattering,
as well as the decay eta' to eta pi pi, results in a range for the mixing angle
which indicates that the quark substructure of these light scalars are closer
to a four quark picture.

14
The categories of this paper are: math-ph
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
30
The categories of this paper are: q-alg