Observation of exclusive DVCS in polarized electron beam asymmetry measurements

Details Observation of exclusive DVCS in polarized electron beam asymmetry measurements Observation of exclusive DVCS in polarized electron beam asymmetry measurements

2001-07-17

arxiv.org/abs/hep-ex/0107043v3

Phys.Rev.Lett.87:182002,2001

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.87.182002

We report the first results of the beam spin asymmetry measured in the reaction e + p -> e + p + gamma at a beam energy of 4.25 GeV. A large asymmetry with a sin(phi) modulation is observed, as predicted for the interference term of Deeply Virtual Compton Scattering and the Bethe-Heitler process. The amplitude of this modulation is alpha = 0.202 +/- 0.028. In leading-order and leading-twist pQCD, the alpha is directly proportional to the imaginary part of the DVCS amplitude.

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