Backward DVCS and Proton to Photon Transition Distribution Amplitudes

We analyse deeply-virtual Compton scattering on a proton target, γ∗P→P′γ in the backward region and in the scaling regime. We define the transition distribution amplitudes which describe the proton to photon transition. Model-independent predictions are given to test this description, for current or planned experiments at JLab or by Hermes.