Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic moment of the rho-meson in QCD sum rules: perturbative
  corrections   The magnetic moment of the rho-meson is calculated in the framework of QCD
sum rules in external fields. Perturbative corrections are taken into account.
Bare loop calculations (parton model) give the value 2.0. The nonperturbative
effects (operators of dimension 6) result in negative contribution, whereas
perturbative corrections -- positive one. The final answer is 1.8.

29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an