Backward-angle photoproduction of ω and η ' mesons from protons in the photon energy range from 1.5 to 3.0 GeV

young. joyce;

We report the measurement of differential cross sections for ω and η
 photoproduction from protons at backward angles (−1.0 < cosX
C.M < −0.8) using linearly polarized photons at Eγ = 1.5–3.0 GeV. The differential cross sections for ω mesons are larger than the predicted
u-channel contribution based on amplitude analysis in the energy range 2.0 ≤ √ s ≤ 2.4 GeV. The differential cross sections for ω and η
 mesons become closer to the predicted u-channel contribution at
√ s > 2.4 GeV. A bump structure in the √ s dependence of the differential cross sections for η  mesons was observed at √ s ∼ 2.35 GeV.