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20 April 2024

» pubmed » pmid17930579

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Recoil Polarization and Beam-Recoil Double Polarization Measurement of eta Electroproduction on the Proton in the Region of the S11(1535) Resonance
H Merkel ; P Achenbach ; C Ayerbe Gayoso ; J C Bernauer ; R Böhm ; D Bosnar ; B Cheymol ; M O Distler ; L Doria ; H Fonvieille ; J Friedrich ; P Janssens ; M Makek ; U Müller ; L Nungesser ; J Pochodzalla ; M Potokar ; S Sánchez Majos ; B S Schlimme ; S Sirca ; L Tiator ; Th Walcher ; M Weinriefer ; ;
Date:	28 Sep 2007
Journal:	Phys Rev Lett, 99 (13), 132301
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(e[over -->],e;{’}p[over -->])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 degrees at the Mainz Microtron MAMI-C. With a center of mass energy range of 1500 MeV<W<1550 MeV the region of the S11(1535) and D13(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.
Source:	PubMed, pmid17930579
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