期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 6, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP06(2010)019
关键词
Lepton-Nucleon Scattering
资金
- DESY management
- FWO-Flanders
- IWT, Belgium
- Natural Sciences and Engineering Research Council of Canada
- National Natural Science Foundation of China
- Alexander von Humboldt Stiftung
- German Bundesministerium fur Bildung und Forschung (BMBF)
- Deutsche Forschungsgemeinschaft (DFG)
- Italian Istituto Nazionale di Fisica Nucleare (INFN)
- MEXT
- JSPS
- G-COE of Japan
- Dutch Foundation for Fundamenteel Onderzoek der Materie (FOM)
- U.K. Engineering and Physical Sciences Research Council
- Science and Technology Facilities Council
- Scottish Universities Physics Alliance
- U.S. Department of Energy (DOE)
- National Science Foundation (NSF)
- Russian Academy of Science
- Russian Federal Agency for Science and Innovations
- Ministry of Economy
- Ministry of Education and Science of Armenia
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.
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