Study of the gp-->etap reaction with the Crystal Ball detector at the Mainz Microtron(MAMI-C)

E.F. McNicoll , S. Prakhov , I.I. Strakovsky , P. Aguar-Bartolomepmainz , L.K. Akasoy , J.R.M. Annand , H.J. Arends , R.A. Arndt

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Ya.I. Azimov K. Bantawa R. Beck V.S. Bekrenev H. Berghaeuser 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 A. Fix B. Freehart D.I. Glazier R. Gregor D. Hamilton E. Heid D. Hornidge I. Jaegle O. Jahn T.C. Jude V.L. Kashevarov J.D. Kellie I. Keshelashvili R. Kondratiev M. Korolija M. Kotulla A.A. Koulbardis S.P. Kruglov B. Krusche V. Lisin K. Livingston I.J.D. MacGregor Y. Maghrbi D.M. Manley Z. Marinides M. Martinez J.C. McGeorge B. McKinnon 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 M.W. Paris P. Pedroni F. Pheron A. Polonski J. Robinson G. Rosner T. Rostomyan S. Schumann M.H. Sikora D.I. Sober A. Starostin I.M. Suarez I. Supek M. Thiel A. Thomas L. Tiator M. Unverzagt D.P. Watts D. Werthmueller R.L. Workman I. Zamboni F. Zehr (Crystal Ball Collaboration at MAMI)

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classification ⚛️ nucl-ex hep-exhep-phnucl-th

keywords gp--productiondataetapreactionanglesballcross

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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 =< W >= 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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Study of the gp-->etap reaction with the Crystal Ball detector at the Mainz Microtron(MAMI-C)

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