Observation of exclusive DVCS in polarized electron beam asymmetry measurements
CLAS Collaboration: S. Stepanyan, et al
TL;DR
This paper reports the first measurement of beam spin asymmetry in exclusive Deeply Virtual Compton Scattering at 4.25 GeV, observing a significant sin(phi) modulation consistent with theoretical predictions.
Contribution
It provides the first experimental evidence of the beam spin asymmetry in DVCS, confirming key theoretical expectations about the interference with Bethe-Heitler process.
Findings
Large sin(phi) modulation observed
Amplitude of asymmetry measured as 0.202 +/- 0.028
Results align with leading-order pQCD predictions
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.
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