期刊
EUROPEAN PHYSICAL JOURNAL C
卷 71, 期 4, 页码 -出版社
SPRINGER
DOI: 10.1140/epjc/s10052-011-1609-2
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资金
- DESY
- Ministry of Economy
- Ministry of Education and Science of Armenia
- 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)
- Russian Academy of Science
- Russian Federal Agency for Science and Innovations
- 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)
- STFC [ST/J000175/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J000175/1] Funding Source: researchfish
Exclusive rho(0)-meson electroproduction is studied in the HERMES experiment, using a 27.6 GeV longitudinally polarized electron/positron beam and unpolarized hydrogen and deuterium targets in the kinematic region 0.5 GeV2 < Q(2) < 7.0 GeV2, 3.0 GeV < W < 6.3 GeV, and -t' < 0.4 GeV2. Real and imaginary parts of the ratios of the natural-parity-exchange helicity amplitudes T-11 (gamma*(T) -> rho T), T-01 (gamma*(T) -> rho(L)), T-10 (gamma*(L) -> rho(T)), and T1-1 (gamma*(-T) -> rho(T)) to T-00 (gamma*(L) -> rho(L)) are extracted from the data. For the unnatural-parity-exchange amplitude U-11, the ratio vertical bar U-11/T-00 vertical bar is obtained. The Q(2) and t' dependences of these ratios are presented and compared with perturbative QCD predictions.
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