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Measurement of the Beam-Spin Azimuthal Asymmetry associated with Deep Virtual Compton Scattering
- Source :
- Physical Review Letters, 87. American Physical Society, Physical review letters 87(18), 182001 (2001). doi:10.1103/PhysRevLett.87.182001, Airapetian, A, van den Brand, J F J, Bulten, H J, Hesselink, W H A, Laziev, A & Simani, M C 2001, ' Measurement of the Beam-Spin Azimuthal Asymmetry associated with Deep Virtual Compton Scattering. ', Physical Review Letters, vol. 87, pp. 182001 . https://doi.org/10.1103/PhysRevLett.87.182001, Physical Review Letters, 87(18). American Physical Society, Physical Review Letters, 87(18):182001. American Physical Society, Airapetian, A, Bulten, H J, Hesselink, W H A, Laziev, A, Schmidt, F, Simani, M C, Thomas, E, van den Brand, J F J & de Visser, J A G M 2001, ' Measurement of the beam-spin azimuthal asymmetry associated with deeply-virtual Compton scattering ', Physical Review Letters, vol. 87, no. 18 . https://doi.org/10.1103/PhysRevLett.87.182001
- Publication Year :
- 2001
-
Abstract
- The beam-spin asymmetry in hard electroproduction of photons has been measured for the first time. 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.<br />Comment: 6 pages, 5 figures, revised experimental description
- Subjects :
- HERMES experiment
Particle physics
Photon
media_common.quotation_subject
interference
General Physics and Astronomy
HERMES
dependence [helicity]
Asymmetry
High Energy Physics - Experiment
24.85.+p
Nuclear physics
13.60.Fz
ddc:550
deep inelastic scattering [positron p]
26.7 GeV
Nuclear Experiment
NUCLEON
media_common
Physics
longitudinal [polarization]
Scattering
ELECTROPRODUCTION
14.20.Dh
Compton scattering
DESY
HERA
Bethe-Heitler [approximation]
DESY HERA Stor
asymmetry [angular distribution]
off-shell [Compton scattering]
analyzing power
Physics::Accelerator Physics
High Energy Physics::Experiment
polarized beam [positron]
electroproduction [photon]
Beam (structure)
experimental results
Subjects
Details
- Language :
- English
- ISSN :
- 00319007
- Database :
- OpenAIRE
- Journal :
- Physical Review Letters, 87. American Physical Society, Physical review letters 87(18), 182001 (2001). doi:10.1103/PhysRevLett.87.182001, Airapetian, A, van den Brand, J F J, Bulten, H J, Hesselink, W H A, Laziev, A & Simani, M C 2001, ' Measurement of the Beam-Spin Azimuthal Asymmetry associated with Deep Virtual Compton Scattering. ', Physical Review Letters, vol. 87, pp. 182001 . https://doi.org/10.1103/PhysRevLett.87.182001, Physical Review Letters, 87(18). American Physical Society, Physical Review Letters, 87(18):182001. American Physical Society, Airapetian, A, Bulten, H J, Hesselink, W H A, Laziev, A, Schmidt, F, Simani, M C, Thomas, E, van den Brand, J F J & de Visser, J A G M 2001, ' Measurement of the beam-spin azimuthal asymmetry associated with deeply-virtual Compton scattering ', Physical Review Letters, vol. 87, no. 18 . https://doi.org/10.1103/PhysRevLett.87.182001
- Accession number :
- edsair.doi.dedup.....d6bebf4ee7b1e37af8079432e0b0ba96