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

Abstract

We report the measurement of differential cross sections for |$\omega$| and |$\eta '$| photoproduction from protons at backward angles (⁠|$-1.0\lt \cos \Theta _{C.M}^{X}\lt -0.8$|⁠) using linearly polarized photons at |$E_{\gamma }=1.5$|–|$3.0$|GeV. The differential cross sections for |$\omega$| mesons are larger than the predicted |$u$|-channel contribution based on amplitude analysis in the energy range |$2.0\leq \sqrt {s}\leq 2.4$|GeV. The differential cross sections for |$\omega$| and |$\eta '$| 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 |$\eta '$| mesons was observed at |$\sqrt {s}\sim 2.35$|GeV.