Observation of exclusive DVCS in polarized electron beam asymmetry measurements

Abstract

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.

6 pages, 5 figures

References in corpus (3)

• Deeply virtual electroproduction of photons and mesons on the nucleon : leading order amplitudes and power corrections
• DVCS on the nucleon : study of the twist-3 effects
• Twist-three observables in deeply virtual Compton scattering on the nucleon

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