Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New vistas of the meson structure in QCD from low to high energies   This talk presents issues pertaining to the quark structure of the pion
within QCD, both from the theoretical and from the experimental point of view.
We review and discuss the pion-photon transition form factor and the pion's
electromagnetic form factor vs. corresponding experimental data from the CLEO
Collaboration and the JLab. We also examine the extent to which recent
high-precision lattice computations of the second moment of the pion's
distribution amplitude conform with theoretical models. Finally, we include
predictions for the azimuthal asymmetry of the $\mu^+$ distribution in the
polarized $\mu$-pair-induced DY production employing various pion distribution
amplitudes.

32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
10
The categories of this paper are: q-bio
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
7
The categories of this paper are: hep-th