Abstract
We present the first measurements of the cross section in the deeply virtual Compton scattering (DVCS) regime and the valence quark region. The dependence (from 1.5 to ) 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 . The helicity-independent cross section is also measured at . We present the first model-independent measurement of linear combinations of GPDs and GPD integrals up to the twist-3 approximation.
- Received 26 July 2006
DOI:https://doi.org/10.1103/PhysRevLett.97.262002
©2006 American Physical Society