Compton Scattering Cross Section on the Proton at High Momentum Transfer

Abstract

Cross-section values for Compton scattering on the proton were measured at 25 kinematic settings over the range s = 5-11 and -t = 2-7 GeV2 with statistical accuracy of a few percent. The scaling power for the s-dependence of the cross section at fixed center of mass angle was found to be 8.0 +/ 0.2, strongly inconsistent with the prediction of perturbative QCD. The observed cross-section values are in fair agreement with the calculations using the handbag mechanism, in which the external photons couple to a single quark.

5 pages, 5 figures

References in corpus (9)

• Generalized parton distributions from nucleon form factor data
• Nonforward parton densities and soft mechanism for form factors and wide-angle Compton scattering in QCD
• Implications of the discrepancy between proton form factor measurements
• Perturbative and non-perturbative QCD corrections to wide-angle Compton scattering
• Recalculation of Proton Compton Scattering in Perturbative QCD
• Proton mass effects in wide-angle Compton scattering
• Polarization Transfer in Proton Compton Scattering at High Momentum Transfer
• Handling the Handbag Diagram in Compton Scattering on the Proton
• Real and Virtual Nucleon Compton Scattering in the Perturbative Limit

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