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27 April 2024

» arxiv » 1012.3676

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Ratios of Helicity Amplitudes for Exclusive rho-0 Electroproduction
HERMES Collaboration ; A. Airapetian ; N. Akopov ; Z. Akopov ; E.C. Aschenauer ; W. Augustyniak ; R. Avakian ; A. Avetissian ; E. Avetisyan ; S. Belostotski ; N. Bianchi ; H.P. Blok ; A. Borissov ; J. Bowles ; V. Bryzgalov ; J. Burns ; M. Capiluppi ; G.P. Capitani ; E. Cisbani ; G. Ciullo ; M. Contalbrigo ; P.F. Dalpiaz ; W. Deconinck ; R. De Leo ; L. De Nardo ; E. De Sanctis ; M. Diefenthaler ; P. Di Nezza ; M. Dueren ; M. Ehrenfried ; G. Elbakian ; F. Ellinghaus ; R. Fabbri ; A. Fantoni ; L. Felawka ; S. Frullani ; D. Gabbert ; G. Gapienko ; V. Gapienko ; F. Garibaldi ; G. Gavrilov ; V. Gharibyan ; F. Giordano ; S. Gliske ; M. Golembiovskaya ; C. Hadjidakis ; M. Hartig ; D. Hasch ; G. Hill ; A. Hillenbrand ; M. Hoek ; Y. Holler ; I. Hristova ; Y. Imazu ; A. Ivanilov ; H.E. Jackson ; H.S. Jo ; S. Joosten ; R. Kaiser ; G. Karyan ; T. Keri ; E. Kinney ; A. Kisselev ; N. Kobayashi ; V. Korotkov ; V. Kozlov ; P. Kravchenko ; V.G. Krivokhijine ; L. Lagamba ; R. Lamb ; L. Lapikas ; I. Lehmann ; P. Lenisa ; L.A. Linden-Levy ; A. Lopez Ruiz ; W. Lorenzon ; X.-G. Lu ; X.-R. Lu ; B.-Q. Ma ; D. Mahon ; N.C.R. Makins ; S.I. Manaenkov ; L. Manfre ; Y. Mao ; B. Marianski ; A. Martinez de la Ossa ; H. Marukyan ; C.A. Miller ; Y. Miyachi ; A. Movsisyan ; V. Muccifora ; M. Murray ; A. Mussgiller ; E. Nappi ; Y. Naryshkin ; A. Nass ; M. Negodaev ; W.-D. Nowak ; L.L. Pappalardo ; R. Perez-Benito ; N. Pickert ; P.E. Reimer ; A.R. Reolon ; C. Riedl ; K. Rith ; G. Rosner ; A. Rostomyan ; J. Rubin ; D. Ryckbosch ; Y. Salomatin ; F. Sanftl ; A. Schaefer ; G. Schnell ; K.P. Schueler ; B. Seitz ; T.-A. Shibata ; V. Shutov ; M. Stancari ; M. Statera ; E. Steffens ; J.J.M. Steijger ; F. Stinzing ; S. Taroian ; A. Terkulov ; A. Trzcinski ; M. Tytgat ; A. Vandenbroucke ; Y. Van Haarlem ; C. Van Hulse ; D. Veretennikov ; V. Vikhrov ; I. Vilardi ; S. Wang ; S. Yaschenko ; S. Yen ; W. Yu ; B. Zihlmann ; P. Zupranski ;
Date:	16 Dec 2010
Abstract:	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 --> ho_T), T_{01} (gamma^_T --> ho_L), T_{10} (gamma^_L --> ho_T), and T_{1-1} (gamma^_{-T} --> ho_T) to T_{00} (gamma^*_L --> ho_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.
Source:	arXiv, 1012.3676
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