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Observation of Exclusive Deeply Virtual Compton Scattering in Polarized Electron Beam Asymmetry Measurements

Stepanyan, S. ; Fissum, Kevin LU orcid and Zhou, Z. (2001) In Physical Review Letters 87(18). p.182002-182002
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.
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author
; and
author collaboration
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
87
issue
18
pages
182002 - 182002
publisher
American Physical Society
external identifiers
  • scopus:85037215478
ISSN
1079-7114
DOI
10.1103/PhysRevLett.87.182002
project
Elastic and Virtual Compton Scattering and Nucleon Polarizabilities
Investigations of and with Polarized Electromagnetic Beams
language
English
LU publication?
no
id
5d8b3a02-b093-4611-9108-5c084c55df59
date added to LUP
2019-06-24 11:39:20
date last changed
2022-03-25 21:03:39
@article{5d8b3a02-b093-4611-9108-5c084c55df59,
  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.}},
  author       = {{Stepanyan, S. and Fissum, Kevin and Zhou, Z.}},
  issn         = {{1079-7114}},
  language     = {{eng}},
  number       = {{18}},
  pages        = {{182002--182002}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Observation of Exclusive Deeply Virtual Compton Scattering in Polarized Electron Beam Asymmetry Measurements}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.87.182002}},
  doi          = {{10.1103/PhysRevLett.87.182002}},
  volume       = {{87}},
  year         = {{2001}},
}