Abstract
Cross-section values for Compton scattering on the proton were measured at 25 kinematic settings over the range s=5-11 and -t=2-7GeV2 with a 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.
Original language | English |
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Article number | 152001 |
Journal | Physical Review Letters |
Volume | 98 |
Issue number | 15 |
DOIs | |
State | Published - 9 Apr 2007 |
Externally published | Yes |