Experimental study of the γp→π0ηp reaction with the A2 setup at the Mainz Microtron

V Sokhoyan,I I Strakovsky,M Ostrick,H J Arends,D Paudyal,Th Strub,G Ron,S Kay,A Neiser,M Wolfes,R Kondratiev,M I Ferretti Bondy,Yu A Usov,M Thiel,S Abt,E Mornacchi,A Fix,D I Glazier,M Unverzagt,N K Walford,M Korolija,Z Ahmed,S Garni,V L Kashevarov,N S Borisov,M Bashkanov,I Gorodnov,L Witthauer,J C Mcgeorge,K Livingston,J Wettig,T Rostomyan,I Keshelashvili,P B Otte,A Thomas,B Krusche,F Cividini,J R M Annand,W Gradl,M Oberle,S Costanza,A Mushkarenkov,P P Martel,P Drexler,A Thiel,S Prakhov,B Strandberg,K Bantawa,O Steffen,P Achenbach,K Spieker,D M Manley,F Afzal,A Polonski,G M Huber,J Ahrens,S Lutterer,S Cherepnya,A Käser,L Heijkenskjöld,A Braghieri,M Biroth,P Pedroni,R Miskimen,I Supek,S Gardner,A Denig,C B Hamill,R Beck,P Adlarson,D P Watts,G M Gurevich,D G Middleton,D Hornidge,C Collicott,M Dieterle,W J Briscoe,I J D Macgregor,E J Downie,V Lisin,P Aguar-Bartolomé,D Werthmüller,C Sfienti,A J Sarty ,A B Neganov ,A B Lazarev ,L.v Filʼkov ,S.r Wagner ,Michael Günther ,L Zana

doi:10.1103/physrevc.97.055212

Abstract

The data available from the A2 Collaboration at MAMI were analyzed to select the γp→π0ηp 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 Eγ=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.11 MoreReceived 7 March 2018DOI:https://doi.org/10.1103/PhysRevC.97.055212©2018 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasParticle & resonance productionPhotonuclear reactionsPhysical SystemsProtonsNuclear Physics

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