The present experiment exploits the interference between the deeply virtual Compton scattering (DVCS) and the Bethe-Heitler processes to extract the imaginary part of DVCS amplitudes on the neutron and on the deuteron from the helicity-dependent D(e⃗,e′γ)X cross section measured at Q2=1.9 GeV2 and xB=0.36. We extract a linear combination of generalized parton distributions (GPDs) particularly sensitive to Eq, the least constrained GPD. A model dependent constraint on the contribution of the up and down quarks to the nucleon spin is deduced.
Mazouz, M.; Holmstrom, Timothy; and Jefferson Lab Hall A Collaboration, "Deeply Virtual Compton Scattering off the Neutron" (2007). Chemistry and Physics Faculty Publications. 25.
Phys. Rev. Lett. 99, 242501 (2007)