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Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in \pi^{0}_{} photoproduction off the proton |
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| Authors: | D Elsner B Bantes O Bartholomy D E Bayadilov R Beck Y A Beloglazov R Castelijns V Crede A Ehmanns K Essig R Ewald I Fabry F Frommberger K Fornet-Ponse M Fuchs C Funke A B Gridnev E Gutz W Hillert S H?ffgen P Hoffmeister I Horn I Jaegle J Junkersfeld H Kalinowsky Frank Klein Friedrich Klein E Klempt M Konrad M Kotulla B Krusche H L?hner I V Lopatin J Lotz S Lugert D Menze T Mertens J G Messchendorp V Metag C Morales M Nanova D V Novinski R Novotny M Ostrick L M Pant H van Pee M Pfeiffer A V Sarantsev C Schmidt H Schmieden B Schoch S Shende A Süle V V Sumachev T Szczepanek U Thoma D Trnka D Walther C Weinheimer C Wendel |
| Institution: | 1. Physikalisches Institut der Universit?t Bonn, Bonn, Germany 2. Helmholtz-Institut für Strahlen- und Kernphysik der Universit?t Bonn, Bonn, Germany 3. Petersburg Nuclear Physics Institute, Gatchina, Russia 5. KVI, University of Groningen, Groningen, The Netherlands 6. Department of Physics, Florida State University, Tallahassee, USA 7. Physikalisches Institut, Universit?t Basel, Basel, Switzerland 8. II. Physikalisches Institut, Universit?t Giessen, Giessen, Germany |
| Abstract: | At the electron accelerator ELSA a linearly polarised tagged photon beam is produced by coherent bremsstrahlung off a diamond
crystal. Orientation and energy range of the linear polarisation can be deliberately chosen by accurate positioning of the
crystal with a goniometer. The degree of polarisation is determined by the form of the scattered electron spectrum. Good agreement
between experiment and expectations on the basis of the experimental conditions is obtained. Polarisation degrees of  % are typically achieved at half of the primary electron energy. The determination of  is confirmed by measuring the beam asymmetry,  , in  photoproduction and by a comparison of the results to independent measurements using laser backscattering. |
| Keywords: | PACS" target="_blank">PACS 13 60 -r Photon and charged-lepton interactions with hadrons 13 60 Le Meson production 13 88 +e Polarization in interactions and scattering |
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