Light-Cone Wavefunction Representation of Deeply Virtual Compton Scattering

We give a complete representation of virtual Compton scattering γp → γp at large initial photon virtuality Q and small momentum transfer squared t in terms of the light-cone wavefunctions of the target proton. We verify the identities between the skewed parton distributions H(x, ζ, t) and E(x, ζ, t) which appear in deeply virtual Compton scattering and the corresponding integrands of the Dirac and Pauli form factors F1(t) and F2(t) and the gravitational form factors Aq(t) and Bq(t) for each quark and anti-quark constituent. We illustrate the general formalism for the case of deeply virtual Compton scattering on the quantum fluctuations of a fermion in quantum electrodynamics at one loop. PACS numbers: 12.20.-m, 12.39.Ki, 13.40.Gp, 13.60.Fz Submitted to Nuclear Physics B. Work partially supported by the Department of Energy, contract DE–AC03–76SF00515. Supported by the Feodor Lynen Program of the Alexander von Humboldt Foundation.