2007/05/24 by H. Merkel, P. Achenbach, C. A. Ayerbe Gayoso +23 · 1 citation
Physics and Astronomy · #Nuclear physics research studies #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-ex
paper · pdf · doi:10.1103/physrevlett.99.132301
published as Phys.Rev.Lett.99:132301,2007 · 4 pages, 1 figure
arxiv created 2007/05/24 · openalex publication_date 2007/09/26 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/02
The beam-recoil double polarization P_x^\ensuremath'h and P_z^\ensuremath'h and the recoil polarization P_y^\ensuremath' were measured for the first time for the p(\stackrel\ensuremath→e,e^\ensuremath'\stackrel\ensuremath→p)\ensuremathη reaction at a four-momentum transfer of Q2=0.1 GeV2/c2 and a center of mass production angle of \ensuremathθ=120\ifmmode^∘\else\textdegree\fi 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^\ensuremath'h and P_z^\ensuremath'h are in good agreement with the model, P_y^\ensuremath' shows a significant deviation, consistent with existing photoproduction data on the polarized-target asymmetry.