Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exclusive high-$Q^2$ electroproduction: light-cone wave functions and
  electromagnetic form factors of mesons,   We apply the light-cone technique to electroproduction reaction $ep\to
e\pi^+n$ long considered as a means of measuring the electromagnetic form
factor of the pion. We show that the interpretation of the long-standing puzzle
of large transverse cross section ($\sigma_T$) in terms of the $\gamma^*\rho\to
\pi$ transition on the $\rho$ mesons in the light-cone proton is possible, but
requires quite a slow decrease of the $F_{\rho\pi}(\q2)$ form factor. This
interpretation can be tested in the related $ep\to e\pi^0p$ reaction.
Corrections which are due to the final-state meson-baryon interactions (FSI)
are evaluated and are shown to amount to a $25\%$ effect at moderately large
$\q2$. Vanishing FSI with increasing $Q^2$ - the color transparency phenomenon
- is shown to be very strong.

7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
1
The categories of this paper are: cs
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc