First measurement of the circular beam asymmetry in the γ→p→π0ηp reaction
- Kashevarov, V.L.
- Fix, A.
- Aguar-Bartolomé, P.
- Akasoy, L.K.
- Annand, J.R.M.
- Arends, H.J.
- Bantawa, K.
- Beck, R.
- Bekrenev, V.
- Berghäuser, H.
- Braghieri, A.
- Branford, D.
- Briscoe, W.J.
- Brudvik, J.
- Cherepnya, S.
- Codling, R.F.B.
- Demissie, B.T.
- Downie, E.J.
- Drexler, P.
- Fil'kov, L.V.
- Glazier, D.I.
- Gregor, R.
- Hamilton, D.
- Heid, E.
- Hornidge, D.
- Jaegle, I.
- Jahn, O.
- Jude, T.C.
- Kellie, J.D.
- Keshelashvili, I.
- Kondratiev, R.
- Korolija, M.
- Kotulla, M.
- Koulbardis, A.
- Kruglov, S.
- Krusche, B.
- Lisin, V.
- Livingston, K.
- MacGregor, I.J.D.
- Maghrbi, Y.
- Manley, D.M.
- Martinez-Fabregate, M.
- McGeorge, J.C.
- McNicoll, E.F.
- Mekterovic, D.
- Metag, V.
- Micanovic, S.
- Middleton, D.
- Mushkarenkov, A.
- Nefkens, B.M.K.
- Nikolaev, A.
- Novotny, R.
- Ostrick, M.
- Otte, P.B.
- Oussena, B.
- Pedroni, P.
- Pheron, F.
- Polonski, A.
- Prakhov, S.N.
- Robinson, J.
- Rosner, G.
- Rostomyan, T.
- Schumann, S.
- Sikora, M.H.
- Sober, D.
- Starostin, A.
- Stakovsky, I.I.
- Suarez, I.M.
- Supek, I.
- Tarbert, C.
- Thiel, M.
- Thomas, A.
- Unverzagt, M.
- Watts, D.P.
- Werthmüller, D.
- Zamboni, I.
- Zehr, F.
DOIAbstract
AbstractThe circular photon asymmetry for π0η photoproduction on the proton was measured for the first time at the tagged photon facility of the MAMI C accelerator using the Crystal Ball/TAPS photon spectrometer. The experimental results are interpreted within a phenomenological isobar model that confirms the dominant role of the Δ(1700)D33 resonance. The measured asymmetry allows us to identify small contributions from positive-parity resonances via interference terms with the dominant D33 amplitude
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