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Ratios of helicity amplitudes for exclusive $$\rho ^0$$ ρ 0 electroproduction on transversely polarized protons

Airapetian, A. ; Akopov, N. ; Akopov, Z. ; Aschenauer, E. C. ; Augustyniak, W. ; Belostotski, S. ; Blok, H. P. ; Borissov, A. ; Bryzgalov, V. ; Capitani, G. P. ; Ciullo, G. ; Contalbrigo, M. ; Deconinck, W. ; De Leo, R. ; De Sanctis, E. ; Düren, M. ; Elbakian, G. ; Ellinghaus, F. ; Felawka, L. ; Frullani, S. ; Garibaldi, F. ; Gavrilov, G. ; Gharibyan, V. ; Goloskokov, S. V. ; Holler, Y. ; Ivanilov, A. ; Jackson, H. E. ; Joosten, S. ; Kaiser, R. ; Karyan, G. ; Kisselev, A. ; Korotkov, V. ; Kozlov, V. ; Kravchenko, P. ; Kroll, P. ; Lagamba, L. ; Lapikás, L. ; Lehmann, I. ; Lenisa, P. ; Lorenzon, W. ; Manaenkov, S. I. ; Marianski, B. ; Marukyan, H. ; Miyachi, Y. ; Movsisyan, A. ; Muccifora, V. ; Nass, A. ; Nowak, W.-D. ; Pappalardo, L. L. ; Petrosyan, A. ; Reimer, P. E. ; Reolon, A. R. ; Riedl, C. ; Rith, K. ; Rosner, G. ; Rostomyan, A. ; Ryckbosch, D. ; Salomatin, Y. ; Schäfer, A. ; Schnell, G. ; Seitz, B. ; Shibata, T.-A. ; Shutov, V. ; Statera, M. ; Terkulov, A. ; Truty, R. ; Trzcinski, A. ; Tytgat, M. ; Van Haarlem, Y. ; Van Hulse, C. ; Veretennikov, D. ; Vikhrov, V. ; Vilardi, I. ; Yaschenko, S. ; Zihlmann, B. ; Zupranski, P.



Abstract

Exclusive rho(0)-meson electroproduction is studied by the HERMES experiment, using the 27.6 GeV longitudinally polarized electron/positron beam of HERA and a transversely polarized hydrogen target, in the kinematic region 1.0 GeV2 < Q(2) < 7.0GeV(2), 3.0GeV< W < 6.3 GeV, and -t' < 0.4 GeV2. Using an unbinned maximum-likelihood method, 25 parameters are extracted. These determine the real and ...

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