Compton Scattering Cross Section on the Proton at High Momentum Transfer

Danagoulian, A.; Mamyan, V. H.; Roedelbronn, M.; Collaboration, the Hall A

Compton Scattering Cross Section on the Proton at High Momentum Transfer

Authors

Danagoulian, A.

Mamyan, V. H.

Roedelbronn, M.

Collaboration, the Hall A

Description

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