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Compton scattering by the proton through θcms = 75° and 90° in the Δ-resonance region |
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| Authors: | A Hünger J Peise A Robbiano J Ahrens I Anthony H -J Arends R Beck G P Capitani B Dolbilkin H Falkenberg G Galler S J Hall J D Kellie R Kondratjev R Kordsmeier V Lisin A I L'vov G J Miller C Molinari P Ottonello A R Reolon M Sanzone M Schmitz M Schneider M Schumacher O Selke Th Walcher F Wissmann S Wolf A Zucchiatti |
| Institution: | a Zweites Physikalisches Institut, Universität Göttingen, D-37073, Göttingen, Germany b Institut für Kernphysik, Universität Mainz, D-55099, Mainz, Germany c I.N.F.N. Sezione di Genova, I-16146, Genova, Italy d Department of Physics and Astronomy, Glasgow University, Glasgow, Scotland, G12 8QQ, UK e I.N.F.N. Laboratori di Frascati, I-00044, Frascati, Italy f Institute for Nuclear Research, Moscow, Russia g P.N. Lebedev Physical Institute, Moscow 117924, Russia |
| Abstract: | Differential cross sections for Compton scattering by the proton have been measured in the energy interval between 200 and 500 MeV at scattering angles of θcms = 75° and θcms = 90° using the CATS, the CATS/TRAJAN, and the COPP setups with the Glasgow Tagger at MAMI (Mainz). The data are compared with predictions from dispersion theory using photo-meson amplitudes from the recent VPI solution SM95. The experiment and the theoretical procedure are described in detail. It is found that the experiment and predictions are in agreement as far as the energy dependence of the differential cross sections in the Δ-range is concerned. However, there is evidence that a scaling down of the resonance part of the M1+3/2 photo-meson amplitude by (2.8 ± 0.9)% is required in comparison with the VPI analysis. The deduced value of the M1+3/2-photoproduction amplitude at the resonance energy of 320 MeV is: |M1+3/2| = (39.6 ± 0.4) × 10?3 mπ+?1. |
| Keywords: | 1H(γ γ) E = 200–500 MeV measured Compton scattering γ(θ) deduced multipole distribution Dispersion relations Δ-resonance |
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