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. 2005 Jan 14;94(1):012004.
doi: 10.1103/PhysRevLett.94.012004. Epub 2005 Jan 14.

Photoproduction of eta mesons off protons for 0.75 GeV<E(gamma)<3 GeV

V Credé  1 , O Bartholomy, A V Anisovich, G Anton, R Bantes, Yu Beloglazov, R Bogendörfer, R Castelijns, A Ehmanns, J Ernst, I Fabry, H Flemming, A Fösel, H Freiesleben, M Fuchs, Ch Funke, R Gothe, A Gridnev, E Gutz, S K Höffgen, I Horn, J Hössl, R Joosten, J Junkersfeld, H Kalinowsky, F Klein, E Klempt, H Koch, M Konrad, B Kopf, B Krusche, J Langheinrich, H Löhner, I Lopatin, J Lotz, H Matthäy, D Menze, J 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; CB-ELSA
Affiliations

Photoproduction of eta mesons off protons for 0.75 GeV<E(gamma)<3 GeV

V Credé et al. Phys Rev Lett. .

Abstract

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 S11 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)D15 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.

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