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Measurement of the beam asymmetry in eta photoproduction off the proton

 
: Elsner, D.; Anisovich, A.V.; Anton, G.; Bacelar, J.C.S.; Bantes, B.; Bartholomy, O.; Bayadilov, D.; Beck, R.; Beloglazov, A.; Bogendörfer, R.; Castelijns, R.; Crede, V.; Dutz, H.; Ehmanns, A.; Essig, K.; Ewald, R,; Fabry, I.; Flemming, H.; Fornet-Ponse, K.; Fuchs, M.; Funke, C.; Gothe, R.; Gregor, R.; Gridnev, A.B.; Gutz, E.; Höffgen, Stefan; Hoffmeister, P.; Horn, I.; Hössl, J.; Jaegle, I.; Junkersfeld, J.; Kalinowsky, H.; Kammer, S.; Kleber, V.; Klein, Frank; Klein, Friedrich; Klempt, E.; Koch, H.; Konrad, M.; Kopf, B.; Kotulla, M.; Krusche, B.; Lang, M.; Langheinrich, J.; Löhner, H.; Lopatin, I.V.; Lotz, J.; Lugert, S.; Matthaey, H.; Menze, D.; Mertens, T.; Messchendorp, J.G.; Metag, V.; Morales, C.; Nanova, M.; Nikonov, V.A.; Novinski, D.V.; Novotny, R.; Ostrick, M.; Pant, L.M.; Pee, H. van; Pfeiffer, M.; Radkov, A.; Sarantsev, A.V.; Schadmand, S.; Schmidt, C.; Schmieden, H.; Schoch, B.; Shende, S.; Suft, G.; Süle, A.; Sumachev, V.; Szczepanek, T.; Thoma, U.; Trnka, D.; Walther, D.; Weinheimer, C.; Wendel, C.

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Volltext ()

The European physical journal. A, Hadrons and nuclei 33 (2007), Nr.2, S.147-155
ISSN: 1434-6001
ISSN: 1434-601X
ISSN: 1431-5831
Englisch
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer INT ()

Abstract
The beam asymmetry, Sigma, was measured at ELSA in the reaction gammaroh -> etaroh using linearly polarised tagged photon beams, produced by coherent bremsstrahlung off a diamond. The crystal was oriented to provide polarised photons in the energy range Egamma = 800 to 1400 MeV with the maximum polarisation of Pgamma = 49% obtained at 1305 MeV. Both dominant decay modes of the eta into two photons and 3pi0 , were used to extract the beam asymmetry from the azimuthal modulation of the cross-section. The measurements cover the angular range Thetacm -~ 50-150 degrees. Large asymmetries up to 80% are observed, in agreement with a previous measurement. The eta-MAID model and the Bonn-Gatchina partial wave analysis describe the measurements, but the required partial waves differ significantly.

: http://publica.fraunhofer.de/dokumente/N-190978.html