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