Compton Scattering Cross Section on the Proton at High Momentum Transfer

Details Compton Scattering Cross Section on the Proton at High Momentum Transfer Compton Scattering Cross Section on the Proton at High Momentum Transfer

2007-01-28

arxiv.org/abs/nucl-ex/0701068v2

Phys.Rev.Lett.98:152001,2007

Physics

Nuclear Physics

Nuclear Experiment

5 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.98.152001

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.

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