Diffractive Exclusive Photon Production in Deep Inelastic Scattering
  Predictions for deep Virtual Compton Scattering are obtained in a two-component dipole model of diffraction. The model automatically includes hard and soft components and implicitly allows for ``hadronic'' contributions via large dipoles. It is also applicable to real Compton Scattering, which provides an important constraint. 
A Donnachie, H G Dosch