"Scaling Tests of the Cross Section for Deeply Virtual Compton Scatteri" by C. Muñpz Camacho, A. Camsonne et al.
We present the first measurements of the ep → epγ cross section in the deeply virtual Compton scattering (DVCS) regime and the valence quark region. The Q2 dependence (from 1.5 to 2.3 GeV2) of the helicity-dependent cross section indicates the twist-2 dominance of DVCS, proving that generalized parton distributions (GPDs) are accessible to experiment at moderate Q2. The helicity-independent cross section is also measured at Q2=2.3 GeV2. We present the first model-independent measurement of linear combinations of GPDs and GPD integrals up to the twist-3 approximation.
Camacho, C. Muñpz; Camsonne, A.; Mazouz, M.; Ferdi, C.; Gavalian, G.; Kuchina, E.; Amaryan, M.; Aniol, K. A.; Beaumel, M.; Benaoum, H.; Hayes, D.; Hyde-Wright, C. E.; Ibrahim, H.; Ulmer, P. E.; and Weinstein, L. B., "Scaling Tests of the Cross Section for Deeply Virtual Compton Scattering" (2006). Physics Faculty Publications. 91.