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Beam asymmetries in near-threshold omega photoproduction off the proton

 
: Klein, F.; Anisovich, A.V.; Bacelar, J.C.S.; Bantes, B.; Bartholomy, O.; Bayadilov, D.; Beck, R.; Beloglazov, Y.A.; Castelijns, R.; Crede, V.; Dutz, H.; Ehmanns, A.; Elsner, D.; Essig, K.; Ewald, R.; Fabry, I.; Fuchs, M.; Funke, C.; Gregor, R.; Gridnev, A.B.; Gutz, E.; Höffgen, Stefan; Hoffmeister, P.; Horn, I.; Jaegle, I.; Junkersfeld, J.; Kalinowsky, H.; Kammer, S.; Kleber, V.; Klein, Friedrich; Klempt, E.; Konrad, M.; Kotulla, M.; Krusche, B.; Lang, M.; Lohner, H.; Lopatin, I.V.; Lotz, J.; Lugert, S.; 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.; Roy, A.; Sarantsev, A.V.; Schmidt, C.; Schmieden, H.; Schoch, B.; Shende, S.; Sokhoyan, V.; Süle, A.; Sumachev, V.V.; Szczepanek, T.; Thoma, U.; Trnka, D.; Varma, R.; Walther, D.; Weinheimer, C.; Wendel, C.

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Physical review. D 78 (2008), Nr.11, Art. 117101, 5 S.
ISSN: 0556-2821
ISSN: 1550-7998
ISSN: 1089-4918
Englisch
Zeitschriftenaufsatz
Fraunhofer INT ()
spectrometer; photon; mesons; taps; eta

Abstract
The photoproduction of omega mesons off protons has been studied at the Bonn ELSA accelerator from threshold to E(gamma) = 1700 MeV. Linearly polarized beams were produced via coherent bremsstrahlung. Large photon asymmetries in excess of 50% were obtained. For the first time the pion asymmetries associated with the omega -> pi(0)gamma decay were measured and found close to zero. The asymmetries indicate s-channel resonance formation on top of t-channel exchange processes.

: http://publica.fraunhofer.de/dokumente/N-190971.html