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Deeply virtual Compton scattering off the neutron

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FIG. 1: Lowest order (QCD) amplitude for the virtual Comp- Comp-ton process. The momentum four-vectors of the incident and scattered photon are q and q ′ , respectively
FIG. 2: (top) Helicity signal (Eq. 4) for D(e, e ′ γ)X and H(e, e ′ γ)X events; H 2 data are folded with a momentum  dis-tribution of the proton in deuterium, and scaled to the D 2
TABLE I: Experimental values of the sin(φ γγ ) moments. The first error is statistical and the second is the total systematic one resulting from the quadratic sum of each contribution.
FIG. 4: Experimental constraint on J u and J d quark angular momenta from the present n-DVCS results

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