QCD analysis of bar p N -> gamma* pi in the scaling limit

Details QCD analysis of bar p N -> gamma* pi in the scaling limit QCD analysis of bar p N -> gamma* pi in the scaling limit

2005-04-27

arxiv.org/abs/hep-ph/0504255v3

Phys.Lett. B622 (2005) 83-92

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 1 .eps figure, to be published in Phys. Lett. B. Equation 23 corrected in version 3

Scientific paper

10.1016/j.physletb.2005.06.080

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.

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