The first measurements of the differential cross section at forward angles and photon energies above 4 GeV were performed at the Thomas Jefferson National Accelerator Facility (JLab). The results indicate evidence of an angular dependent scaling threshold. Results at are consistent with the constituent counting rules for , while those at are consistent with the constituent counting rules for .
- Received 4 June 2001
- Published 16 August 2001
© 2001 The American Physical Society