UP - logo
E-viri
Celotno besedilo
Odprti dostop
  • Eberhardt, H; Jude, T C; Schmieden, H; Anisovich, A V; Bantes, B; Bayadilov, D; Beck, R; Yu Beloglazov; Bichow, M; Boese, S; K -Th Brinkmann; Challand, Th; Crede, V; Diez, F; Drexler, P; Dutz, H; Elsner, D; Ewald, R; net-Ponse, K; Friedrich, St; Frommberger, F; Funke, Ch; Gottschall, M; Gridnev, A; Gruener, 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; Mueller, 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; H van Pee; Walther, D; Wendel, Ch; Wiedner, U; Wilson, A; Winnebeck, A

    arXiv.org, 09/2015
    Paper

    The first measurements of the beam-target-helicity-asymmetries \(E\) and \(G\) in the photoproduction of \(\omega\)-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 (\(E_\gamma = 1108\)~MeV) to \(E_\gamma = 2300\)~MeV and \(G\) at a single energy interval of \(1108 < E_\gamma <1300\)~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 \(J^P=3/2^+, 5/2^+\), and \(3/2^-\).