Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2003-11-21
Phys.Rev.Lett. 94 (2005) 012004
Physics
High Energy Physics
High Energy Physics - Experiment
LaTeX, 4 pages including 4 eps-figures, submitted to Phys. Rev. Lett. The publication of hep-ex/0311045 is accompanied by hep-
Scientific paper
10.1103/PhysRevLett.94.012004
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 p eta. At medium energies we find evidence for a new resonance N(2070)D15 with (mass, width) = (2068+-22, 295+-40) MeV. At photon energies above 1.5 GeV, a strong peak in forward direction develops, signalling the exchange of vector mesons in the t channel.
Bartholomy Olivia
Crede Volker
for the CB-ELSA Collaboration
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