Recoil polarization and beam-recoil double polarization measurement of $\eta$ electroproduction on the proton in the region of the $S_{11}$(1535) resonance
- Merkel, H.
- Achenbach, P.
- Gayoso, C. A. Ayerbe
- Bernauer, J. C.
- Böhm, R.
- Bosnar, D.
- Cheymol, B.
- Distler, M. O.
- Doria, L.
- Fonvieille, H.
- Friedrich, J.
- Janssens, P.
- Makek, M.
- Müller, U.
- Nungesser, L.
- Pochodzalla, J.
- Potokar, M.
- Majos, S. Sánchez
- Schlimme, B. S.
- Širca, S.
- Tiator, L.
- Walcher, Th.
- Weinriefer, M.
DOIAbstract
4 pages, 1 figure, collaboration A1, MAMI Sonde, soumis à PRLThe beam-recoil double polarization P_{x'}^h and P_{z'}^h and the recoil polarization P_{y'} were measured for the first time for the p(\vec{e},e'\vec{p})\eta reaction at a four-momentum transfer of Q^2=0.1 GeV^2/c^2 and a center of mass production angle of \theta = 120^\circ at MAMI C. With a center of mass energy range of 1500 MeV < W < 1550 MeV the region of the S_{11}(1535) and D_{13}(1520) resonance was covered. The results are discussed in the framework of a phenomenological isobar model (Eta-MAID). While P_{x'}^h and P_{z'}^h are in good agreement with the model, P_{y'} shows a significant deviation, consistent with existing photoproduction data on the polarized-target asym...
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