Journal Article

PreJuSER-50044

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Photoproduction of eta mesons off protons for 0.75 GeV kleiner E(gamma) kleiner 3 GeV

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

2005
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/1660  doi:10.1103/PhysRevLett.94.012004

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 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.

Keyword(s): photon p: exclusive reaction ; eta: photoproduction ; eta: decay modes ; nucleon resonance: intermediate state ; nucleon resonance: mass spectrum ; nucleon resonance: width ; isobar model ; angular distribution ; channel cross section: energy dependence ; four-pi-detector: experimental results ; Bonn ELSA Stor ; photon p --> p eta ; eta --> 2photon ; eta --> 3pi0 ; 0.7-3.0 GeV

Note: Record converted from VDB: 12.11.2012

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Contributing Institute(s):

1. Institut 1 (Experimentelle Kernphysik I) (IKP-E-I)

Research Program(s):

1. Physik der Hadronen (M01)

Appears in the scientific report 2005
Notes: This version is available at the following Publisher URL: http://prl.aps.org

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