Ratios of helicity amplitudes for exclusive ρ0 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.
DOIAbstract
Exclusive ρ0-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<Q2<7.0 GeV2, 3.0 GeV <W<6.3 GeV, and −t′< 0.4 GeV2. Using an unbinned maximum-likelihood method, 25 parameters are extracted. These determine the real and imaginary parts of the ratios of several helicity amplitudes describing ρ0-meson production by a virtual photon. The denominator of those ratios is the dominant amplitude, the nucleon-helicity-non-flip amplitude F012012, which describes the production of a longitudinal ρ0-meson by a longitudinal virtual photon. The ratios of nucleon-helicity-non...
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