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Measurement of the G asymmetry for the γp↦Nπ channels in the Δ(1232) resonance region |
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| Authors: | J Ahrens S Altieri J R M Annand H -J Arends R Beck A Braghieri N d'Hose H Dutz S Goertz P Grabmayr S Hasegawa E Heid H Holvoet L Van Hoorebeke N Horikawa T Iwata O Jahn P Jennewein R Kondratiev J Krimmer M Lang B Lannoy K Livingston J C McGeorge W Meyer A Panzeri P Pedroni T Pinelli I Preobrajenski G Reicherz G Rosner M Rost T Rostomyan D Ryckbosch M Schumacher B Seitz G Tamas A Thomas R van de Vyver Th Walcher F Zapadtka |
| Institution: | 7. Institut für Kernphysik, Universit?t Mainz, D-55099, Mainz, Germany 11. INFN, Sezione di Pavia, I-27100, Pavia, Italy 12. Dipartimento di Fisica Nucleare e Teorica, Università di Pavia, I-27100, Pavia, Italy 5. Department of Physics and Astronomy, University of Glasgow, G12 8QQ, Glasgow, UK 4. CEA Saclay, DSM/DAPNIA/SPhN, F-91191, Gif-sur-Yvette Cedex, France 2. Physikalisches Institut, Universit?t Bonn, D-53115, Bonn, Germany 1. Institut für Experimentalphysik, Ruhr-Universit?t Bochum, D-44801, Bochum, Germany 13. Physikalisches Institut, Universit?t Tübingen, D-72076, Tübingen, Germany 10. CIRSE, Nagoya University, Nagoya, Japan 3. Subatomaire en Stralingsfysica, Universiteit Gent, B-9000, Gent, Belgium 9. Department of Physics, Nagoya University, Nagoya, Japan 8. INR, Academy of Science, Moscow, Russia 6. II. Physikalisches Institut, Universit?t G?ttingen, D-37073, G?ttingen, Germany |
| Abstract: | The G asymmetry of the γp↦Nπ reaction has been measured for the first time for Eγ = 340±14 MeV. This observable, for which very scarce published data exist, plays an important role to disentangle the contributions of the various nucleon resonances. The experiment, performed at the Mainz microtron MAMI, used a 4π-detector system, a linearly polarized, tagged photon beam, and a longitudinally polarized proton target. |
| Keywords: | 13 60 Le Meson production 14 20 Gk Baryon resonances with S = 0 25 20 Lj Photoproduction reactions |
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