期刊
PHYSICS LETTERS B
卷 679, 期 2, 页码 100-105出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physletb.2009.07.023
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资金
- FWO-Flanders, Belgium
- Natural Sciences and Engineering Research Council of Canada
- National Natural Science Foundation of China
- Alexander von Humboldt Stiftung
- German Bunclesministerium fur Bildung und Forschung (BMBF)
- Deutsche Forschungsgerneinschaft (DFG)
- Italian Istituto Nazionale di Fisica Nucleate (INFN)
- MEXT JSPS
- COE21 of Japan
- Dutch Foundation for Funclamenteel Onderzoek der Materie (FOM)
- UK Engineering and Physical Sciences Research Council
- Particle Physics and Astronomy Research Council
- Scottish Universities Physics Alliance
- US Department of Energy (DOE)
- National Science Foundation (NSF)
- Russian Academy of Science
- Russian Federal Agency for Science and Innovations
- Ministry of Trade and Economical Development
- Ministry of Education and Science of Armenia
- European Community [RII3-CT-2004-506078]
The exclusive electroproduction of rho(0) mesons was studied with the HERMES spectrometer at the DESY laboratory by scattering 27.6 GeV positron and electron beams off a transversely polarized hydrogen target. Spin density matrix elements for this process were determined from the measured production- and decay-angle distributions of the rho(0) mesons. These matrix elements embody information on helicity transfer and the validity of s-channel helicity conservation in the case of a transversely polarized target. From the spin density matrix elements, the leading-twist term in the single-spin asymmetry was Calculated separately for longitudinally and transversely polarized rho(0) mesons. Neglecting s-channel helicity changing matrix elements, results for the former can be compared to calculations based on generalized parton distributions, which are sensitive to the contribution of the total angular momentum of the quarks to the proton spin. (C) 2009 Elsevier B.V. All rights reserved.
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