Scaling tests of the cross-section for deeply virtual compton scattering

Jul, 2006
6 pages
Published in:
  • Phys.Rev.Lett. 97 (2006) 262002
e-Print:
Report number:
  • DAPNIA-06-451,
  • JLAB-PHY-06-503
Experiments:

Citations per year

200320092015202120250510152025
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