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Airapetian, A; Akopov, N; Akopov, Z; Aschenauer, E C; Augustyniak, W; Avakian, R; Avetissian, A; Avetisyan, E; Belostotski, S; Bianchi, N; Blok, H P; Borissov, A; Bowles, J; Bryzgalov, V; Burns, J; Capiluppi, M; Capitani, G P; Cisbani, E; Ciullo, G; Contalbrigo, M; Dalpiaz, P F; Deconinck, W; Leo, R; Nardo, L; Sanctis, E; Diefenthaler, M; Nezza, P; Dueren, M; Ehrenfried, M; Elbakian, G; Ellinghaus, F; Fabbri, R; Fantoni, A; Felawka, L; Frullani, S; Gabbert, D; Gapienko, G; Gapienko, V; Garibaldi, F; Gavrilov, G; Gharibyan, V; Giordano, F; Gliske, S; Golembiovskaya, M; Hadjidakis, C; Hartig, M; Hasch, D; Hill, G; Hillenbrand, A; Hoek, M; et. al
The European physical journal. C, Particles and fields, 04/2011, Letnik: 71, Številka: 4Journal Article
Exclusive rho super(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 GeV super(2)<Q super(2)<7.0 GeV super(2), 3.0 GeV <W<6.3 GeV, and -t'<0.4 GeV super(2). Real and imaginary parts of the ratios of the natural-parity-exchange helicity amplitudes T sub(11) ( $\gamma*}_{T} \rightarrow\rho_{T}$ ), T sub(01) ( $\gamma*}_{T} \rightarrow \rho_{L}$ ), T sub(10) ( $\gamma*}_{L} \rightarrow\rho_{T}$ ), and T sub(1-1) ( $\gamma*}_{-T} \rightarrow\rho_{T}$ ) to T sub(00) ( $\gamma*}_{L}\rightarrow\rho_{L}$ ) are extracted from the data. For the unnatural-parity-exchange amplitude U sub(11), the ratio |U sub(11)/T sub(00)| is obtained. The Q super(2) and t' dependences of these ratios are presented and compared with perturbative QCD predictions.
