QCD analysis of p¯N→γ∗π in the scaling limit

  title={QCD analysis of p¯N→$\gamma$∗$\pi$ in the scaling limit},
  author={B. Pire and L. Szymanowski},
  journal={Physics Letters B},
Abstract We study the scaling regime of nucleon–antinucleon annihilation into a deeply virtual photon and a meson, p ¯ N → γ ∗ π , in the forward kinematics, where | t | ≪ Q 2 ∼ s . 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… Expand
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