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Updated: Aug 4, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Photoproduction of eta mesons off protons for 0.75 GeV<E(gamma)<3 GeV
V Credé1, O Bartholomy, A V Anisovich
1Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Nussallee 14-16, D-53115 Bonn, Germany.
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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