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. 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.
- Löhner, H.
- 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.
DOIAbstract
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 ...
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