Scaling tests of the cross-section for deeply virtual compton scattering
Jul, 20066 pages
Published in:
- Phys.Rev.Lett. 97 (2006) 262002
e-Print:
- nucl-ex/0607029 [nucl-ex]
Report number:
- DAPNIA-06-451,
- JLAB-PHY-06-503
Experiments:
Citations per year
Abstract: (arXiv)
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.Note:
- 5 pages, 4 figures, 2 tables. Text shortened for publication. References added. One figure removed
- 13.60.Hb
- 13.60.Fz
- 13.40.Gp
- 14.20.Dh
- electron p: deep inelastic scattering
- electron: polarized beam
- photon: photoproduction
- deeply virtual Compton scattering
- interference: Bethe-Heitler
- generalized parton distribution
References(30)
Figures(5)