Phys. Rev. Lett. 94, 012004 (2005) [5 pages]Photoproductionof η Mesonsoff Protons for 0.75 GeV<Eγ<3 GeVReceived 29 November 2003; revised 14 July 2004; published 14 January 2005 Totaland differential cross sections for the reaction p(γ,η)p havebeen measured for photon energies in the range from 750 MeV to 3 GeV. Thelow-energy data are dominated by the S11 wave which has two poles in the energy region below 2 GeV. Eleven nucleonresonances are observed in their decay into pη.At medium energies we find evidence for a new resonance N(2070)D15 with (M,Γ)=(2068±22, 295±40) MeV.At γ energiesabove 1.5 GeV, a strong peak in the forward direction develops, signalingthe exchange of vector mesons in the t channel. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.94.012004
DOI:
10.1103/PhysRevLett.94.012004
PACS:
14.20.Gk, 13.60.Le
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