Journal article
Authors list: 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.
Publication year: 2007
Pages: 147-155
Journal: The European Physical Journal A
Volume number: 33
Issue number: 2
ISSN: 1434-6001
eISSN: 1434-601X
Open access status: Green
DOI Link: https://doi.org/10.1140/epja/i2007-10447-9
Publisher: Springer
Abstract:
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.
Citation Styles
Harvard Citation style: Elsner, D., Anisovich, A., Anton, G., Bacelar, J., Bantes, B., Bartholomy, O., et al. (2007) Measurement of the beam asymmetry in η photoproduction off the proton, The European Physical Journal A, 33(2), pp. 147-155. https://doi.org/10.1140/epja/i2007-10447-9
APA Citation style: Elsner, D., Anisovich, A., Anton, G., Bacelar, J., Bantes, B., Bartholomy, O., Bayadilov, D., Beck, R., Beloglazov, Y., Bogendoerfer, R., Castelijns, R., Crede, V., Dutz, H., Ehmanns, A., Essig, K., Ewald, R., Fabry, I., Flemming, H., Fornet-Ponse, K., ...Wendel, C. (2007). Measurement of the beam asymmetry in η photoproduction off the proton. The European Physical Journal A. 33(2), 147-155. https://doi.org/10.1140/epja/i2007-10447-9
Keywords
COHERENT BREMSSTRAHLUNG; ELECTROPRODUCTION; LIGHT-BARYON SPECTRUM; RELATIVISTIC QUARK-MODEL
