2005/04/30 by B. Pire, L. Szymanowski · 1 citation
Mathematics · Physics and Astronomy · #Amplitude #Annihilation #Distribution (mathematics) #HERA #High-Energy Particle Collisions Research #Mathematical analysis #Mathematics #Meson #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #hep-ph
paper · pdf · doi:10.1016/j.physletb.2005.06.080
published as Phys.Lett.B622:83-92,2005 · 15 pages, 1 .eps figure, to be published in Phys. Lett. B. Equation 23 corrected in version 3
openalex publication_date 2005/07/07 · arxiv created 2007/02/08 · arxiv updated 2014/11/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 Q2 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.