Photoproduction of eta mesons off protons for 0.75 GeV

V. Crede, O. Bartholomy, A.V. Anisovich, G. Anton, R. Bantes, Yu. Beloglazov, R. Bogendorfer, R.J.J. Castelijns, A. Ehmanns, J.M.P.G. Ernst, I. Fabry, H. Flemming, A. Fosel, H. Freiesleben, M. Fuchs, Ch. Funke, R. Gothe, A. Gridnev, E. Gutz, S.K. HoffgenI. Horn, J. Hosl, R. Joosten, J. Junkersfeld, H. Kalinowsky, F Klein, E. Klempt, H.R. Koch, M. Konrad, B. Kopf, B. Krusche, J. Langheinrich, H. Löhner, I. Lopatin, J. Lotz, H. Matthay, D.W. Menze, J.G. Messchendorp, C. Morales, D. Novinski, M. Ostrick, H. van Pee, A. Radkov, J. Reinnarth, A.V. Sarantsev, S. Schadmand, Ch. Schmidt, H. Schmieden, B. Schoch, G. Suft, V. Sumachev, T. Szczepanek, U. Thoma, D. Walther, Ch. Weinheimer

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    168 Citations (Scopus)


    Total and differential cross sections for the reaction p(gamma,eta)p have been measured for photon energies in the range from 750 MeV to 3 GeV. The low-energy data are dominated by the S-11 wave which has two poles in the energy region below 2 GeV. Eleven nucleon resonances are observed in their decay into peta. At medium energies we find evidence for a new resonance N(2070)D-15 with (M,Gamma)=(2068+/-22, 295+/-40) MeV. At gamma energies above 1.5 GeV, a strong peak in the forward direction develops, signaling the exchange of vector mesons in the t channel.

    Original languageEnglish
    Article number012004
    Number of pages5
    JournalPhysical Review Letters
    Issue number1
    Publication statusPublished - 14-Jan-2005


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