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Scaling Tests of the Cross Section for Deeply Virtual Compton Scattering

The Hall A DVCS Collaboration
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Abstract

We present the first measurements of the \vec{e}p->epg cross section in the deeply virtual Compton scattering (DVCS) regime and the valence quark region. The Q^2 dependence (from 1.5 to 2.3 GeV^2) 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 Q^2. The helicity-independent cross section is also measured at Q^2=2.3 GeV^2. We present the first model-independent measurement of linear combinations of GPDs and GPD integrals up to the twist-3 approximation.

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The Hall A DVCS Collaboration. 2006-12-29. Scaling Tests of the Cross Section for Deeply Virtual Compton Scattering. https://doi.org/10.1103/physrevlett.97.262002

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