Study of the $\gamma p -> \eta p$ reaction with the Crystal Ball detector at the Mainz Microtron(MAMI-C)

E F Mcnicoll,B Krusche,A Starostin,A Fix,I Keshelashvili,D Mekterovic,D I Glazier,D G Middleton,A Braghieri,M Kotulla, Andrew L Thomas,Michael Thiel,Z Marinides,R Novotny,S Micanovic,V Metag,W J Briscoe,D Hornidge,L Tiator,P B Otte,V Lisin,M Unverzagt,J C Mcgeorge,J Brudvik,A A Koulbardis,E J Downie,A V Nikolaev,Richard A Arndt,I Zamboni,D P Watts,E Heid,T Rostomyan,M Ostrick,D M Manley,Ya I Azimov,I Jaegle,L V Filkov,D I Sober,B Freehart,Mark Wayne Paris,R F B Codling,J R M Annand,D Branford,V S Bekrenev,S P Kruglov,B M K Nefkens,F Pheron,S N Prakhov,R Kondratiev,B T Demissie,H Berghauser,P Pedroni,R Beck,O Jahn,P Aguarbartolome,T C Jude,A Polonski,D Hamilton,G Rosner,K Bantawa,P Drexler,Indara Suarez,I I Strakovsky,B Oussena,M Korolija,Marek Sikora,L K Akasoy,Y Maghrbi,I Supek,H J Arends,I J D Macgregor,James Robinson,S Schumann,B Mckinnon,R Gregor,R L Workman,A Mushkarenkov,V L Kashevarov,D Werthmuller,J D Kellie,M Martinez,K Livingston,F Zehr,S Cherepnya

PHYSICAL REVIEW C（2011）

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Abstract

The gp-->etap reaction has been measured with the Crystal Ball and TAPS multiphoton spectrometers in the energy range from the production threshold of 707 MeV to 1.4 GeV (1.49 = = 1.87 GeV). Bremsstrahlung photons produced by the 1.5-GeV electron beam of the Mainz Microtron MAMI-C and momentum analyzed by the Glasgow Tagging Spectrometer were used for the eta-meson production. Our accumulation of 3.8 x 10^6 gp-->etap-->3pi0p-->6gp events allows a detailed study of the reaction dynamics. The gp-->etap differential cross sections were determined for 120 energy bins and the full range of the production angles. Our data show a dip near W = 1680 MeV in the total cross section caused by a substantial dip in eta production at forward angles. The data are compared to predictions of previous SAID and MAID partial-wave analyses and to thelatest SAID and MAID fits that have included our data.

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Key words

spectrometer

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