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Measurement of the beam asymmetry in η photoproduction off the proton

Elsner, D. and Anisovich, A. V. and Anton, G. and Bacelar, J. C. S. and Bantes, B. and Bartholomy, O. and Bayadilov, D. E. and Beck, R. and Beloglazov, Y. A. and Bogendoerfer, R. and Castelijns, R. and Crede, V. and Dutz, H. and Ehmanns, A. and Essig, K. and Ewald, R. and Fabry, I. and Flemming, H. and Fornet-Ponse, K. and Fuchs, M. and Funke, C. and Gothe, R. and Gregor, R. and Gridnev, A. B. and Gutz, E. and Hoeffgen, S. and Hoffmeister, P. and Horn, I. and Hoessl, J. and Jaegle, I. and Junkersfeld, J. and Kammer, H. Kalinowsky S. and Klein, V. Kleber Frank and Klein, Friedrich and Klempt, E. and Koch, H. and Konrad, M. and Kopf, B. and Kotulla, M. and Krusche, B. and Lang, M. and Langheinrich, J. and Ohner, H. L. and Lopatin, I. V. and Lotz, J. and Ay, S. Lugert H. Matth and Menze, D. and Mertens, T. and Messchendorp, J. G. and Metag, V. and Morales, C. and Nanova, M. and Nikonov, V. A. and Novinski, D. V. and Novotny, R. and Ostrick, M. and Pant, L. M. and Van Pee, H. and Pfeiffer, M. and Radkov, A. K. and Sarantsev, A. V. and Schadmand, S. and Schmidt, C. and Schmieden, H. and Schoch, B. and Shende, S. and Ule, A. S. and Sumachev, V. V. and Szczepanek, T. and Thoma, U. and Trnka, D. and Walther, D. and Weinheimer, C. and Wendel, C. and Suft, G. and Suele, A. and Sumachev, V. V. and Szczepanek, T. and Thoma, U. and Trnka, D. and Walther, D. and Weinheimer, C. and Wendel, C.. (2007) Measurement of the beam asymmetry in η photoproduction off the proton. The European physical journal. A, Hadrons and nuclei, Vol. 33, H. 2. pp. 147-155.

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Official URL: http://edoc.unibas.ch/dok/A5261929

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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 differ significantly.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Springer-Verlag
ISSN:1434-6001
Note:Variant title: Measurement of the beam asymmetry in eta photoproduction off the proton -- Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:55

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