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The beam-recoil double polarization P_{x'}^h and P_{z'}^h and the recoilpolarization P_{y'} were measured for the first time for thep(\vec{e},e'\vec{p})\eta reaction at a four-momentum transfer of Q^2=0.1GeV^2/c^2 and a center of mass production angle of \theta = 120^\circ at MAMIC. With a center of mass energy range of 1500 MeV < W < 1550 MeV the region ofthe S_{11}(1535) and D_{13}(1520) resonance was covered. The results arediscussed in the framework of a phenomenological isobar model (Eta-MAID). WhileP_{x'}^h and P_{z'}^h are in good agreement with the model, P_{y'} shows asignificant deviation, consistent with existing photoproduction data on thepolarized-target asymmetry.

physical review letters

Recoil polarization and beam-recoil double polarization measurement of  \eta electroproduction on the proton in the region of the S_{11}(1535)  resonance