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Ratios of Helicity Amplitudes for Exclusive rho-0 Electroproduction

  • 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.
  • And 117 more
Published Article
Publication Date
May 02, 2011
Submission Date
Dec 16, 2010
DOI: 10.1140/epjc/s10052-011-1609-2
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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 GeV^2 < Q^2 < 7.0 GeV^2, 3.0 GeV < W < 6.3 GeV, and -t' < 0.4 GeV^2. 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 T_{1-1} (\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 |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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