Photoproduction of eta mesons off protons for 0.75 GeV
- Crede, V.
- Bartholomy, O.
- Anisovich, A.V.
- Anton, G.
- Bantes, R.
- Beloglazov, Yu.
- Bogendorfer, R.
- Castelijns, R.J.J.
- Ehmanns, A.
- Ernst, J.M.P.G.
- Fabry, I.
- Flemming, H.
- Fosel, A.
- Freiesleben, H.
- Fuchs, M.
- Funke, Ch.
- Gothe, R.
- Gridnev, A.
- Gutz, E.
- Hoffgen, S.K.
- Horn, I.
- Hosl, J.
- Joosten, R.
- Junkersfeld, J.
- Kalinowsky, H.
- Klein, F
- Klempt, E.
- Koch, H.R.
- Konrad, M.
- Kopf, B.
- Krusche, B.
- Langheinrich, J.
- Löhner, H.
- Lopatin, I.
- Lotz, J.
- Matthay, H.
- Menze, D.W.
- Messchendorp, J.G.
- Morales, C.
- Novinski, D.
- Ostrick, M.
- van Pee, H.
- Radkov, A.
- Reinnarth, J.
- Sarantsev, A.V.
- Schadmand, S.
- Schmidt, Ch.
- Schmieden, H.
- Schoch, B.
- Suft, G.
- Sumachev, V.
- Szczepanek, T.
- Thoma, U.
- Walther, D.
- Weinheimer, Ch.
Publication date
January 2005
DOIAbstract
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.</p
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