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

Abstract : The 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 asymmetry.
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Journal articles
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http://hal.in2p3.fr/in2p3-00149415
Contributor : Jeanine Pellet <>
Submitted on : Friday, May 25, 2007 - 3:17:05 PM
Last modification on : Tuesday, April 20, 2021 - 12:00:10 PM

### Citation

H. Merkel, P. Achenbach, C. A. Ayerbe Gayoso, J. C. Bernauer, R. Böhm, et al.. Recoil polarization and beam-recoil double polarization measurement of $\eta$ electroproduction on the proton in the region of the $S_{11}$(1535) resonance. Physical Review Letters, American Physical Society, 2007, 99, pp.132301. ⟨10.1103/PhysRevLett.99.132301⟩. ⟨in2p3-00149415⟩

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