Observation of exclusive deeply virtual Compton scattering in polarized electron beam asymmetry measurements

By C. C. S. Stepanyan, et al. 2001

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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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/bffbea593a68250064f11adb5386aa7a8a5e962a