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Eberhardt, H.; Jude, T.C.; Schmieden, H.; Anisovich, A.V.; Bantes, B.; Bayadilov, D.; Beck, R.; Beloglazov, Yu; Bichow, M.; Böse, S.; Brinkmann, K.-Th; Challand, Th; Crede, V.; Diez, F.; Drexler, P.; Dutz, H.; Elsner, D.; Ewald, R.; Fornet-Ponse, K.; Friedrich, St; Frommberger, F.; Funke, Ch; Gottschall, M.; Gridnev, A.; Grüner, M.; Gutz, E.; Hammann, Ch; Hannappel, J.; Hartmann, J.; Hillert, W.; Hoffmeister, Ph; Honisch, Ch; Jaegle, I.; Kaiser, D.; Kalinowsky, H.; Kalischewski, F.; Kammer, S.; Keshelashvili, I.; Kleber, V.; Klein, F.; Klempt, E.; Koop, K.; Krusche, B.; Kube, M.; Lang, M.; Lopatin, I.; Maghrbi, Y.; Makonyi, K.; Metag, V.; Meyer, W.; Müller, J.; Nanova, M.; Nikonov, V.; Novotny, R.; Piontek, D.; Reeve, S.; Reicherz, G.; Rostomyan, T.; Runkel, S.; Sarantsev, A.; Schaepe, St; Schmidt, Ch; Schmitz, R.; Seifen, T.; Sokhoyan, V.; Sumachev, V.; Thiel, A.; Thoma, U.; Urban, M.; van Pee, H.; Walther, D.; Wendel, Ch; Wiedner, U.; Wilson, A.; Winnebeck, A.
Physics letters. B, 11/2015, Letnik: 750, Številka: CJournal Article
The first measurements of the beam-target-helicity-asymmetries E and G in the photoproduction of ω-mesons off protons at the CBELSA/TAPS experiment are reported. E (G) was measured using circularly (linearly) polarised photons and a longitudinally polarised target. E was measured over the photon energy range from close to threshold (Eγ=1108 MeV) to Eγ=2300 MeV and G at a single energy interval of 1108<Eγ<1300 MeV. Both measurements cover the full solid angle. The observables E and G are highly sensitive to the contribution of baryon resonances, with E acting as a helicity filter in the s-channel. The new results indicate significant s-channel resonance contributions together with contributions from t-channel exchange processes. A partial wave analysis reveals strong contributions from the partial waves with spin-parity JP=3/2+,5/2+, and 3/2−.
