Exclusive Leptoproduction of Real Photons on a Longitudinally Polarised Hydrogen Target
Collaboration
19 pages
Published in:
- JHEP 06 (2010) 019
e-Print:
- 1004.0177 [hep-ex]
Report number:
- DESY-10-046
Experiments:
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Citations per year
Abstract: (arXiv)
Polarisation asymmetries are measured for the hard exclusive leptoproduction of real photons from a longitudinally polarised hydrogen target. These asymmetries arise from the deeply virtual Compton scattering and Bethe-Heitler processes. From the data are extracted two asymmetries in the azimuthal distribution of produced real photons about the direction of the exchanged virtual photon: A_UL with respect to the target polarisation and A_LL with respect to the product of the beam and target polarisations. Results for both asymmetries are compared to the predictions from a generalised parton distribution model. The sin(phi) and cos(0*phi) amplitudes observed respectively for the A_UL and A_LL asymmetries are compatible with the sizeable predictions from the model. Unexpectedly, a sin(2*phi) modulation in the A_UL asymmetry with a magnitude similar to that of the sin(phi) modulation is observed.Note:
- 18 pages, 2 figures, 5 tables
- Lepton-Nucleon Scattering
- positron p: exclusive reaction
- photon: electroproduction
- polarized beam: longitudinal
- polarized target: longitudinal
- deeply virtual Compton scattering
- scattering: Bethe-Heitler
- angular distribution: asymmetry
- generalized parton distribution
- HERMES
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