Measurement of Deeply Virtual Compton Scattering with a Polarized Proton Target

Details Measurement of Deeply Virtual Compton Scattering with a Polarized Proton Target Measurement of Deeply Virtual Compton Scattering with a Polarized Proton Target

2006-05-04

arxiv.org/abs/hep-ex/0605012v3

Phys.Rev.Lett.97:072002,2006

Physics

High Energy Physics

High Energy Physics - Experiment

Modified text slightly, added references

Scientific paper

10.1103/PhysRevLett.97.072002

The longitudinal target-spin asymmetry A_UL for the exclusive electroproduction of high energy photons was measured for the first time in p(e,e'p\gamma). The data have been accumulated at Jefferson Lab with the CLAS spectrometer using 5.7 GeV electrons and a longitudinally polarized NH_3 target. A significant azimuthal angular dependence was observed, resulting from the interference of the Deeply Virtual Compton Scattering and Bethe-Heitler processes. The amplitude of the sin(phi) moment is 0.252 +/- 0.042(stat) +/- 0.020(sys). Theoretical calculations are in good agreement with the magnitude and the kinematic dependence of the target-spin asymmetry, which is sensitive to the generalized parton distributions H and H-tilde.

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