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Backward-angle photoproduction of $ω$ and $η'$ mesons from protons at $E_γ=1.5-3.0$ GeV

We report the measurement of differential cross sections for $ω$ and $η'$ photoproduction from protons at backward angles ($-1.0<\cosΘ_{C.M}^{X}<-0.8$) using linearly polarized photons at $E_γ=$$1.5-3.0$ GeV. Differential cross sections for $ω$ mesons are larger than the predicted $u$-channel contribution in the energy range $2.0\leq\sqrt{s}\leq2.4$ GeV. The differential cross sections for $ω$ and $η'$ mesons become closer to the predicted $u$-channel contribution at $\sqrt{s}>2.4$ GeV. A bump structure in the $\sqrt{s}$ dependence of the differential cross sections for $η'$ mesons was observed at $\sqrt{s}\sim$2.35 GeV.