期刊
PHYSICS LETTERS B
卷 682, 期 4-5, 页码 345-350出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2009.11.039
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资金
- DESY
- FWO-Flanders and 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 Nucleate (INFN)
- MEXT, JSPS, and G-COE of Japan
- Dutch Foundation for Fundamenteel Onderzoek der Materie (FOM)
- UK Engineering and Physical Sciences Research Council, the Science and Technology Facilities Council, and the Scottish Universities Physics Alliance
- US Department of Energy (DOE) and the National Science Foundation (NSF)
- Russian Academy of Science and the Russian Federal Agency for Science and Innovations
- Ministry of Economy and the Ministry of Education and Science of Armenia
- European Community [RII3-CT-2004-506078]
Exclusive electroproduction of pi(+) mesons was studied by scattering 27.6 GeV positrons or electrons off a transversely polarized hydrogen target. The single-spin azimuthal asymmetry with respect to target polarization was measured as a function of the Mandelstam variable t, the Bjorken scaling variable x(B), and the virtuality Q(2) of the exchanged photon. The extracted Fourier components of the asymmetry were found to be consistent with zero, except one that was found to be large and that involves interference of contributions from longitudinal and transverse virtual photons. (C) 2009 Elsevier B.V. All rights reserved.
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