Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: QCD analysis of bar p N -> gamma* pi in the scaling limit   We study the scaling regime of nucleon - anti-nucleon annihilation into a
deeply virtual photon and a meson, bar p N -> gamma* pi. We obtain the leading
twist amplitude in the kinematical region where it factorizes into an
antiproton distribution amplitude, a short-distance matrix element related to
nucleon form factor and the long-distance dominated transition distribution
amplitudes which describe the nucleon to meson transition. We give the Q^2
evolution equation for these transition distribution amplitudes. The scaling of
the cross section of this process may be tested at the proposed GSI intense
anti-proton beam facility FAIR with the PANDA or PAX detectors. We comment on
related processes such as pi N -> N' gamma* and gamma* N -> N' pi which may be
experimentally studied at intense meson beams facilities and at JLab or Hermes,
respectively.

22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
20
The categories of this paper are: acc-phys
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex