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

University of California at Los Angeles, Department of Physics and Astronomy, Los Angeles, CA 90095, CLAS Collaboration

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

We report the first results of the beam-spin asymmetry measured in the reaction ep → epγ at a beam energy of 4.25 GeV. A large asymmetry with a sinφ modulation is observed, as predicted for the interference term of deeply virtual compton scattering (DVCS) and the Bethe-Heitler process. The amplitude of this modulation is α=0.202±0.028. In leading-order and leading-twist perturbative QCD, the α is directly proportional to the imaginary part of the DVCS amplitude.

Original languageEnglish (US)
Number of pages1
JournalPhysical Review Letters
Volume87
Issue number18
DOIs
StatePublished - Jan 1 2001

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    University of California at Los Angeles, Department of Physics and Astronomy, Los Angeles, CA 90095, & CLAS Collaboration (2001). Observation of exclusive deeply virtual compton scattering in polarized electron beam asymmetry measurements. Physical Review Letters, 87(18). https://doi.org/10.1103/PhysRevLett.87.182002