Phys. Rev. D 71, 111501(R) (2005) [5 pages]Hadron annihilation into two photons and backward virtual Compton scattering in the scaling regime of QCD
We study the scaling regime of hadron-(anti)hadron annihilation into a deeply virtual photon and a real photon, HH̅ →γ*γ, and backward virtual Compton scattering, γ*H→Hγ. We advocate that there is a kinematical region where the scattering amplitude factorizes into a short-distance matrix element and a long-distance dominated object: a transition distribution amplitude which describes the hadron to photon transition. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.71.111501
DOI:
10.1103/PhysRevD.71.111501
PACS:
13.60.−r, 13.88.+e, 14.20.Dh
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