Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $\pi$-$A_1$ electromagnetic form factors and light-cone QCD sum rules   Electromagnetic form factors of the transition $\pi+\gamma_{virt.}\ra A_1$
are calculated by QCD sum rules technique with the description of the pion in
terms of the set of wave functions of increasing twist. Obtained results are
compared with standard QCD sum rule calculations.

29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th