Scaling Tests of the Cross Section for Deeply Virtual Compton Scattering

Details Scaling Tests of the Cross Section for Deeply Virtual Compton Scattering Scaling Tests of the Cross Section for Deeply Virtual Compton Scattering

2006-07-26

arxiv.org/abs/nucl-ex/0607029v2

Phys.Rev.Lett.97:262002,2006

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 4 figures, 2 tables. Text shortened for publication. References added. One figure removed

Scientific paper

10.1103/PhysRevLett.97.262002

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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