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Proceedings of International Europhysics Conference on High Energy Physics — PoS(HEP2005)
We study the scaling regime of nucleon -anti-nucleon annihilation into a deeply virtual photon and a photon or meson,pN £ γ ¤ π,pN £ γ ¤ γ, in the forward direction. The leading twist amplitude factorizes into an antiproton distribution amplitude, a short-distance matrix element and a long-distance dominated transition distribution amplitude (TDA) which describes the nucleon to meson or photon transition. The impact representation of this TDA maps out the transverse locations of the small sizedoi:10.22323/1.021.0103 fatcat:47fowtnignhphbtylinw2vfcrm