First measurement of the circular beam asymmetry in the gamma p --> pi0 eta p reaction

V.L.Kashevarov , A.Fix , P.Aguar-Bartolom\'e , L.K.Akasoy , J.R.M.Annand , H.J.Arends , K.Bantawa , R.Beck

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V.Bekrenev H.Bergh\"auser A.Braghieri D.Branford W.J.Briscoe J.Brudvik S.Cherepnya R.F.B.Codling B.T.Demissie E.J.Downie P.Drexler L.V.Fil'kov D.I.Glazier R.Gregor D.Hamilton E.Heid D.Hornidge I.Jaegle O.Jahn T.C.Jude J.D.Kellie I.Keshelashvili R.Kondratiev M.Korolija M.Kotulla A.Koulbardis S.Kruglov B.Krusche V.Lisin K.Livingston I.J.D.MacGregor Y.Maghrbi D.M.Manley M.Martinez-Fabregate J.C.McGeorge E.F.McNicoll D.Mekterovic V.Metag S.Micanovic D.Middleton A.Mushkarenkov B.M.K.Nefkens A.Nikolaev R.Novotny M.Ostrick P.B.Otte B.Oussena P.Pedroni F.Pheron A.Polonski S.N.Prakhov J.Robinson G.Rosner T.Rostomyan S.Schumann M.H.Sikora D.Sober A.Starostin I.I.Stakovsky I.M.Suarez I.Supek C.Tarbert M.Thiel A.Thomas M.Unverzagt D.P.Watts D.Werthm\"uller I.Zamboni F.Zehr. (The Crystal Ball at MAMI TAPS A2 Collaborations)

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classification ⚛️ nucl-ex hep-exnucl-th

keywords asymmetryphotoncirculardominantfirstmeasuredacceleratorallows

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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.

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First measurement of the circular beam asymmetry in the gamma p --> pi0 eta p reaction

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