Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spectra of heavy quarkonia in a Bethe-Salpeter-equation approach   In a covariant Bethe-Salpeter-equation approach and with a rainbow-ladder
truncated model of QCD, we investigate the use of an effective interaction with
the goal of reproducing QCD phenomenology. We extend previous studies and
present results for ground and excited meson states in the bottomonium and
charmonium systems, where the results are surprisingly good for most states. In
addition, we formulate a critical outlook on states with exotic quantum numbers
as well as the light-quark domain.

6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th