Recoil Polarization and Beam-Recoil Double Polarization Measurement of {eta} Electroproduction on the Proton in the Region of the S{sub 11}(1535) Resonance
- Institut fuer Kernphysik, Johannes Gutenberg-Universitaet Mainz, D-55099 Mainz (Germany)
- Department of Physics, University of Zagreb, HR-10002 Zagreb (Croatia)
- Laboratoire de Physique Corpusculaire IN2P3-CNRS, Universite Blaise Pascal, F-63170 Aubiere Cedex (France)
The beam-recoil double polarization P{sub x{sup '}}{sup h} and P{sub z{sup '}}{sup h} and the recoil polarization P{sub y{sup '}} were measured for the first time for the p(e-vector,e{sup '}p-vector){eta} reaction at a four-momentum transfer of Q{sup 2}=0.1 GeV{sup 2}/c{sup 2} and a center of mass production angle of {theta}=120 deg. at the Mainz Microtron MAMI-C. With a center of mass energy range of 1500 MeV<W<1550 MeV the region of the S{sub 11}(1535) and D{sub 13}(1520) resonance was covered. The results are discussed in the framework of a phenomenological isobar model (Eta-MAID). While P{sub x{sup '}}{sup h} and P{sub z{sup '}}{sup h} are in good agreement with the model, P{sub y{sup '}} shows a significant deviation, consistent with existing photoproduction data on the polarized-target asymmetry.
- OSTI ID:
- 21024201
- Journal Information:
- Physical Review Letters, Vol. 99, Issue 13; Other Information: DOI: 10.1103/PhysRevLett.99.132301; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). A1 Collaboration; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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