Abstract
Exclusive ρ 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 (\(\gamma^{*}_{T} \rightarrow\rho_{T}\)), T 01 (\(\gamma^{*}_{T} \rightarrow \rho_{L}\)), T 10 (\(\gamma^{*}_{L} \rightarrow\rho_{T}\)), and T 1−1 (\(\gamma^{*}_{-T} \rightarrow\rho_{T}\)) to T 00 (\(\gamma^{*}_{L}\rightarrow\rho_{L}\)) are extracted from the data. For the unnatural-parity-exchange amplitude U 11, the ratio |U 11/T 00| is obtained. The Q 2 and t′ dependences of these ratios are presented and compared with perturbative QCD predictions.
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The HERMES Collaboration., Airapetian, A., Akopov, N. et al. Ratios of helicity amplitudes for exclusive ρ0 electroproduction. Eur. Phys. J. C 71, 1609 (2011). https://doi.org/10.1140/epjc/s10052-011-1609-2
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DOI: https://doi.org/10.1140/epjc/s10052-011-1609-2