Photoproduction of η mesons from the neutron: Cross sections and double polarization observable E
- Witthauer, L.
- Dieterle, M.
- Afzal, F.
- Anisovich, A. V.
- Bantes, B.
- Bayadilov, D.
- Beck, R.
- Bichow, M.
- Brinkmann, K. -T.
- Boese, S.
- Challand, Th.
- Crede, V.
- Dutz, H.
- Eberhardt, H.
- Elsner, D.
- Ewald, R.
- Fornet-Ponse, K.
- Friedrich, St.
- Frommberger, F.
- Funke, Ch.
- Goertz, St.
- Gottschall, M.
- Gridnev, A.
- Gruener, M.
- Gutz, E.
- Hammann, D.
- Hammann, Ch.
- Hannappel, J.
- Hartmann, J.
- Hillert, W.
- Hoffmeister, Ph.
- Honisch, Ch.
- Jude, T.
- Kaiser, D.
- Kalinowsky, H.
- Kalischewski, F.
- Kammer, S.
- Kaser, A.
- Keshelashvili, I.
- Klassen, P.
- Kleber, V.
- Klein, F.
- Koop, K.
- Krusche, B.
- Lang, M.
- Lopatin, I.
- Mahlberg, Ph.
- Makonyi, K.
- Metag, V.
- Meyer, W.
- Mueller, J.
- Muellers, J.
- Nanova, M.
- Nikonov, V.
- Piontek, D.
- Reicherz, G.
- Rostomyan, T.
- Sarantsev, A.
- Schmidt, Ch.
- Schmieden, H.
- Seifen, T.
- Sokhoyan, V.
- Spieker, K.
- Thiel, A.
- Thoma, U.
- Urban, M.
- van Pee, H.
- Walford, N. K.
- Walther, D.
- Wendel, Ch.
- Werthmueller, D.
- Wilson, A.
- Winnebeck, A.
DOIAbstract
Results from measurements of the photoproduction of η mesons from quasifree protons and neutrons are summarized. The experiments were performed with the CBELSA/TAPS detector at the electron accelerator ELSA in Bonn using the η→3π0→6γ decay. A liquid deuterium target was used for the measurement of total cross sections and angular distributions. The results confirm earlier measurements from Bonn and the MAMI facility in Mainz about the existence of a narrow structure in the excitation function of γn→nη. The current angular distributions show a forward-backward asymmetry, which was previously not seen, but was predicted by model calculations including an additional narrow P11 state. Furthermore, data obtained with a longitudinally polarized, ...
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