Photoproduction of eta-mesons off protons
- Bartholomy, O.
- Bogendörfer, R.
- Crede, V.
- Fabry, I.
- Anisovich, A.V.
- Anton, G.
- Bantes, B.
- Beloglazov, A.
- Castelijns, R.
- Ehmanns, A.
- Ernst, J.
- Flemming, H.
- Foesel, A.
- Fuchs, M.
- Funke, C.
- Gothe, R.
- Gridnev, A.B.
- Gutz, E.
- Höffgen, Stefan
- Horn, I.
- Hössl, J.
- Junkersfeld, J.
- Kalinowsky, H.
- Klein, F.
- Klempt, E.
- Koch, H.
- Konrad, M.
- Kopf, B.
- Krusche, B.
- Langheinrich, J.
- Löhner, H.
- Lopatin, I.V.
- Lotz, J.
- Matthaey, H.
- Menze, D.
- Messchendorp, J.G.
- Nikonov, V.A.
- Novinski, D.V.
- Ostrick, M.
- Pee, H. van
- Radkov, A.
- Sarantsev, A.V.
- Schadmand, S.
- Schmidt, C.
- Schmieden, H.
- Schoch, B.
- Suft, G.
- Sumachev, V.
- Szczepanek, T.
- Thoma, U.
- Walther, D.
- Weinheimer, C.
DOIAbstract
Photoproduction of eta-mesons was studied with the Crystal-Barrel detector at ELSA for photon energies in the range from 0.75 to 3GeV. Total and differential cross-sections are presented. The eta mesons are detected in two decay modes, in eta -> 2gamma and in eta -> 3pi0 -> 6gamma. The cross-sections vary slowly as functions of energy and eta production angle suggesting that only few resonances make significant contributions to the cross-section. For photon energies above 1.5GeV, the differential cross-sections show a strong forward peak due to meson exchanges in the t channel. A comparison of the eta-photoproduction cross-sections with SAID and MAID as well as with a partial-wave analysis performed on our data in combination with other dat...
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