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Measurement of the beam asymmetry in eta photoproduction off the proton RID B-7536-2008

Author:: Elsner, D. Anisovich, A. V. Anton, G. Bacelar, J. C. S. Bantes, B. Bartholomy, O. Bayadilov, D. E. Beck, R. Beloglazov, Y. A. Bogendoerfer, 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. Hoeffgen, S. Hoffmeister, P. Horn, I. Hoessl, J. Jaegle, I. Junkersfeld, J. Kammer, H. Kalinowsky S. Klein, V. Kleber Frank Klein, Friedrich Klempt, E. Koch, H. Konrad, M. Kopf, B. Kotulla, M. Krusche, B. Lang, M. Langheinrich, J. Ohner, H. L. Lopatin, I. V. Lotz, J. Ay, S. Lugert H. Matth 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. Van Pee, H. Pfeiffer, M. Radkov, A. K. Sarantsev, A. V. Schadmand, S. Schmidt, C. Schmieden, H. Schoch, B. Shende, S. Ule, A. S. Sumachev, V. V. Szczepanek, T. Thoma, U. Trnka, D. Walther, D. Weinheimer, C. Wendel, C. Suft, G. Suele, A. Sumachev, V. V. Szczepanek, T. Thoma, U. Trnka, D. Walther, D. Weinheimer, C. Wendel, C.
Journal:: EUROPEAN PHYSICAL JOURNAL A
Issue Date:: 2007
Abstract(summary):: The beam asymmetry, Sigma, was measured at ELSA in the reaction gamma p -> eta p using linearly polarised tagged photon beams, produced by coherent bremsstrahlung o ff a diamond. The crystal was oriented to provide polarised photons in the energy range E-gamma = 800 to 1400MeV with the maximum polarisation of P-gamma = 49% obtained at 1305MeV. Both dominant decay modes of the eta into two photons and 3 pi(0) were used to extract the beam asymmetry from the azimuthal modulation of the cross- section. The measurements cover the angular range circle minus cm similar or equal to 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 di ff er significantly.
Page:: 147---155

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Measurement of the beam asymmetry in eta photoproduction off the proton RID B-7536-2008

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