2000/10/31 by Th. Pospischil, P. Bartsch, D. Baumann +51 · 4 citations
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #nucl-ex
paper · pdf · doi:10.1103/physrevlett.86.2959
published as Phys.Rev.Lett.86:2959-2962,2001 · 5 pages LaTeX, 1 table, 2 eps figures
arxiv created 2000/10/31 · openalex publication_date 2001/04/02 · arxiv updated 2009/12/01 · openalex created_date 2017/04/07 · openalex updated_date 2026/07/28
The recoil proton polarization has been measured in the p(\stackrel\ensuremath→e,e^\ensuremath'\stackrel\ensuremath→p)\ensuremathπ0 reaction in parallel kinematics around W\phantom\rule0ex0ex=\phantom\rule0ex0ex1232\phantom\rule0ex0exMeV, Q2\phantom\rule0ex0ex=\phantom\rule0ex0ex0.121\phantom\rule0ex0ex(GeV/c)2, and \ensuremathε\phantom\rule0ex0ex=\phantom\rule0ex0ex0.718 using the polarized cw electron beam of the Mainz Microtron. All three proton polarization components, Px/Pe\phantom\rule0ex0ex=\phantom\rule0ex0ex(\ensuremath-11.4\ifmmode±\else\textpm\fi1.3\ifmmode±\else\textpm\fi1.4)%, Py\phantom\rule0ex0ex=\phantom\rule0ex0ex(\ensuremath-43.1\ifmmode±\else\textpm\fi1.3\ifmmode±\else\textpm\fi2.2)%, and Pz/Pe\phantom\rule0ex0ex=\phantom\rule0ex0ex(56.2\ifmmode±\else\textpm\fi1.5\ifmmode±\else\textpm\fi2.6)%, could be measured simultaneously. The Coulomb quadrupole to magnetic dipole ratio, CMR\phantom\rule0ex0ex=\phantom\rule0ex0ex(\ensuremath-6.4\ifmmode±\else\textpm\fi0.7stat\ifmmode±\else\textpm\fi0.8syst)%, was determined from Px in the framework of the Mainz Unitary Isobar Model. The consistency among the reduced polarizations and the extraction of the ratio of longitudinal-to-transverse response is discussed.