Study of the γ pto π⁰η p reaction with the A2 setup at MAMI

V.Sokhoyan , S.Prakhov , A.Fix , S.Abt , P.Achenbach , P.Adlarson , F.Afzal , P.Aguar-Bartolom\'e

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Z.Ahmed J.Ahrens J.R.M.Annand H.J.Arends K.Bantawa M.Bashkanov R.Beck M.Biroth N.S.Borisov A.Braghieri W.J.Briscoe S.Cherepnya F.Cividini C.Collicott S.Costanza A.Denig M.Dieterle E.J.Downie P.Drexler M.I.Ferretti Bondy L.V.Fil'kov S.Gardner S.Garni D.I.Glazier D.Glowa I.Gorodnov W.Gradl M.G\"unther G.M.Gurevich C. B. Hamill L.Heijkenskj\"old D.Hornidge G.M.Huber T.C.Jude A.K\"aser V.L.Kashevarov S.Kay I.Keshelashvili R.Kondratiev M.Korolija B.Krusche A.Lazarev J.Linturi V.Lisin K.Livingston S.Lutterer I.J.D.MacGregor R.Macrae D.M.Manley P.P.Martel J.C.McGeorge E.F.McNicoll D.G.Middleton R.Miskimen E.Mornacchi C.Mullen A.Mushkarenkov A.Neganov A.Neiser A.Nikolaev M.Oberle M.Ostrick P.Ott P.B.Otte D.Paudyal P.Pedroni A.Polonski A.Rajabi J.Robinson G.Ron G.Rosner T.Rostomyan A.Sarty C.Sfienti M.H.Sikora K.Spieker O.Steffen I.I.Strakovsky B.Strandberg Th.Strub I.Supek A.Thiel M.Thiel A.Thomas M.Unverzagt Yu.A.Usov S.Wagner N.K.Walford D.P.Watts D.Werthm\"uller J.Wettig L.Witthauer M.Wolfes L.A.Zana

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keywords datagammareactioncomparedenergymamimeasuredobservables

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The data available from the A2 Collaboration at MAMI were analyzed to select the $\gamma p\to \pi^0\eta p$ reaction on an event-by-event basis, which allows for partial-wave analyses of three-body final states to obtain more reliable results, compared to fits to measured distributions. These data provide the world's best statistical accuracy in the energy range from threshold to $E_{\gamma}=1.45$ GeV, allowing a finer energy binning in the measurement of all observables needed for understanding the reaction dynamics. The results obtained for the measured observables are compared to existing models, and the impact from the new data is checked by the fit with the revised Mainz model.

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Study of the γ pto π⁰η p reaction with the A2 setup at MAMI

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