Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hyperspherical harmonic study of identical-flavor four-quark systems   We present an exact method based on a hyperspherical harmonic expansion to
study systems made of quarks and antiquarks of the same flavor. Our formalism
reproduces and improves the results obtained with variational approaches. This
analysis shows that identical-flavor four-quark systems with non-exotic
$2^{++}$ quantum numbers may be bound independently of the quark mass. $0^{+-}$
and $1^{+-}$ states become attractive only for larger quarks masses.

1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th