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Measurement of the beam-spin azimuthal asymmetry associated with deeply-virtual Compton scattering

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Abstract
The beam-spin asymmetry in hard electroproduction of photons has been measured. The data have been accumulated by the HERMES experiment at DESY using the HERA 27.6 GeV longitudinally polarized positron beam and an unpolarized hydrogen-gas target. The asymmetry in the azimuthal distribution of the produced photons in the angle phi relative to the lepton scattering plane was determined with respect to the helicity state of the incoming positron beam. The beam-spin analyzing power in the sin phi moment was measured to be -0.23 +/- 0.04(stat) +/- 0.03(syst) in the missing-mass range below 1.7 GeV. The observed asymmetry is attributed to the interference of the Bethe-Heitler and deeply virtual Compton scattering processes.
Keywords
ELECTROPRODUCTION, NUCLEON

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Chicago
Airapetian, A, the HERMES Collaboration, Brecht Hommez, Dirk Ryckbosch, and Michael Tytgat. 2001. “Measurement of the Beam-spin Azimuthal Asymmetry Associated with Deeply-virtual Compton Scattering.” Physical Review Letters 87 (18).
APA
Airapetian, A., HERMES Collaboration, the, Hommez, B., Ryckbosch, D., & Tytgat, M. (2001). Measurement of the beam-spin azimuthal asymmetry associated with deeply-virtual Compton scattering. PHYSICAL REVIEW LETTERS, 87(18).
Vancouver
1.
Airapetian A, HERMES Collaboration the, Hommez B, Ryckbosch D, Tytgat M. Measurement of the beam-spin azimuthal asymmetry associated with deeply-virtual Compton scattering. PHYSICAL REVIEW LETTERS. 2001;87(18).
MLA
Airapetian, A, the HERMES Collaboration, Brecht Hommez, et al. “Measurement of the Beam-spin Azimuthal Asymmetry Associated with Deeply-virtual Compton Scattering.” PHYSICAL REVIEW LETTERS 87.18 (2001): n. pag. Print.
@article{137800,
  abstract     = {The beam-spin asymmetry in hard electroproduction of photons has been measured. The data have been accumulated by the HERMES experiment at DESY using the HERA 27.6 GeV longitudinally polarized positron beam and an unpolarized hydrogen-gas target. The asymmetry in the azimuthal distribution of the produced photons in the angle phi relative to the lepton scattering plane was determined with respect to the helicity state of the incoming positron beam. The beam-spin analyzing power in the sin phi moment was measured to be -0.23 +/- 0.04(stat) +/- 0.03(syst) in the missing-mass range below 1.7 GeV. The observed asymmetry is attributed to the interference of the Bethe-Heitler and deeply virtual Compton scattering processes.},
  articleno    = {182001},
  author       = {Airapetian, A and HERMES Collaboration, the and Hommez, Brecht and Ryckbosch, Dirk and Tytgat, Michael},
  issn         = {0031-9007},
  journal      = {PHYSICAL REVIEW LETTERS},
  language     = {eng},
  number       = {18},
  pages        = {5},
  title        = {Measurement of the beam-spin azimuthal asymmetry associated with deeply-virtual Compton scattering},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.87.182001},
  volume       = {87},
  year         = {2001},
}

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