Study of η and η' photoproduction at MAMI
- Kashevarov, V.L.
- Ott, P.
- Prakhov, S.
- Adlarson, P.
- Afzal, F.
- Ahmed, Z.
- Akondi, C.S.
- Annand, J.R.M.
- Arends, H.J.
- Beck, R.
- Braghieri, A.
- Briscoe, W.J.
- Cividini, F.
- Codling, R.
- Collicott, C.
- Costanza, S.
- Denig, A.
- Downie, E.J.
- Dieterle, M.
- Ferretti Bondy, M.I.
- Filkov, L.V.
- Fix, A.
- Gardner, S.
- Garni, S.
- Glazier, D.I.
- Glowa, D.
- Gradl, W.
- Gurevich, G.
- Hamilton, D.J.
- Hornidge, D.
- Howdle, D.
- Huber, G.M.
- Käser, A.
- Kay, S.
- Keshelashvili, I.
- Kondratiev, R.
- Korolija, M.
- Krusche, B.
- Linturi, J.
- Lisin, V.
- Livingston, K.
- MacGregor, I.J.D.
- MacRae, R.
- Mancell, J.
- Manley, D.M.
- Martel, P.P.
- McGeorge, J.C.
- McNicol, E.
- Middleton, D.G.
- Miskimen, R.
- Mornacchi, E.
- Mullen, C.
- Mushkarenkov, A.
- Neiser, A.
- Oberle, M.
- Ostrick, M.
- Otte, P.B.
- Oussena, B.
- Paudyal, D.
- Pedroni, P.
- Polyanski, V.V.
- Rajabi, A.
- Reicherz, G.
- Robinson, J.
- Rosner, G.
- Rostomyan, T.
- Sarty, A.
- Schott, D.M.
- Schumann, S.
- Sfienti, C.
- Sokhoyan, V.
- Spieker, K.
- Steffen, O.
- Strandberg, B.
- Strakovsky, I.I.
- Strub, Th.
- Supek, I.
- Taragin, M.F.
- Thiel, A.
- Thiel, M.
- Tiator, L.
- Thomas, A.
- Unverzagt, M.
- Wagner, S.
- Watts, D.P.
- Werthmüller, D.
- Wettig, J.
- Witthauer, L.
- Wolfes, M.
- Workman, R.L.
- Zana, L.
DOIAbstract
The reactions γp → ηp and γp → η0 p are measured from their thresholds up to the center-of-mass energy W ¼ 1.96 GeV with the tagged-photon facilities at the Mainz Microtron, MAMI. Differential cross sections are obtained with unprecedented statistical accuracy, providing fine energy binning and full production-angle coverage. A strong cusp is observed in the total cross section for η photoproduction at the energies in the vicinity of the η0 threshold, W ¼ 1896 MeV (Eγ ¼ 1447 MeV). Within the framework of a revised ηMAID isobar model, the cusp, in connection with a steep rise of the η0 total cross section from its threshold, can only be explained by a strong coupling of the poorly known Nð1895Þ1=2− state to both ηp and η0 p. Includi...
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