{"paper":{"title":"First measurement of the circular beam asymmetry in the gamma p --> pi0 eta p reaction","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","nucl-th"],"primary_cat":"nucl-ex","authors_text":"A2 Collaborations), A.Braghieri, A.Fix, A.Koulbardis, A.Mushkarenkov, A.Nikolaev, A.Polonski, A.Starostin, A.Thomas, B.Krusche, B.M.K.Nefkens, B.Oussena, B.T.Demissie, C.Tarbert, D.Branford, D.Hamilton, D.Hornidge, D.I.Glazier, D.Mekterovic, D.Middleton, D.M.Manley, D.P.Watts, D.Sober, D.Werthm\\\"uller, E.F.McNicoll, E.Heid, E.J.Downie, F.Pheron, F.Zehr. (The Crystal Ball at MAMI, G.Rosner, H.Bergh\\\"auser, H.J.Arends, I.I.Stakovsky, I.Jaegle, I.J.D.MacGregor, I.Keshelashvili, I.M.Suarez, I.Supek, I.Zamboni, J.Brudvik, J.C.McGeorge, J.D.Kellie, J.R.M.Annand, J.Robinson, K.Bantawa, K.Livingston, L.K.Akasoy, L.V.Fil'kov, M.H.Sikora, M.Korolija, M.Kotulla, M.Martinez-Fabregate, M.Ostrick, M.Thiel, M.Unverzagt, O.Jahn, P.Aguar-Bartolom\\'e, P.B.Otte, P.Drexler, P.Pedroni, R.Beck, R.F.B.Codling, R.Gregor, R.Kondratiev, R.Novotny, S.Cherepnya, S.Kruglov, S.Micanovic, S.N.Prakhov, S.Schumann, TAPS, T.C.Jude, T.Rostomyan, V.Bekrenev, V.Lisin, V.L.Kashevarov, V.Metag, W.J.Briscoe, Y.Maghrbi","submitted_at":"2010-09-21T13:46:04Z","abstract_excerpt":"The circular photon asymmetry for pi0 eta 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 Delta(1700)D33 resonance. The measured asymmetry allows us to identify small contributions from positive-parity resonances via interference terms with the dominant D33 amplitude."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.4093","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}