Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On meson masses   It is shown that in the framework of analytical confinement, when quark and
gluon propagators are induced by an vacuum selfdual gluon field with constant
strength, the masses of meson with quantum numbers $Q=J^P$ and quark
constituents $m_1,~m_2$ are described with reasonable accuracy by the formula
$$ M_Q(m_1,m_2)=(m_1+m_2)[1+{A_Q\over (m_1^2+1.13m_1m_2+m_2^2)^{0.625}}],$$
where a constant positive parameter $A_Q$ is unique for all mesons with quantum
numbers $Q=J^P$. Sets of mesons $J^P=0^-,~1^-,~0^+,~1^+,~2^+,~3^-$ and
different flavors constituent quarks $(u=d,~s,~,c~,b)$ are considered.

29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
9
The categories of this paper are: nlin