Y. Morino, Y. Nakatsugawa, M. Yosoi, M. Niiyama, D. S. Ahn, J. K. Ahn, S. Ajimura, W. C. Chang, J. Y. Chen, S. Date, H. Fujimura, S. Fukui, K. Hicks, T. Hiraiwa, T. Hotta, S. H. Hwang, K. Imai, T. Ishikawa, Y. Kato, H. Kawai, M. J. Kim, H. Kohri, Y. Kon, P. J. Lin, K. Mase, Y. Maeda, M. Miyabe, N. Muramatsu, T. Nakano, H. Noumi, Y. Ohashi, T. Ohta, M. Oka, J. D. Parker, C. Rangacharyulus, S. Y. Ryu, T. Saito, T. Sawada, H. Shimizu, E. A. Strokovsky, Y. Sugaya, M. Sumihama, K. Suzuki, K. Tanida, A. Tokiyasu, T. Tomioka, T. Tsunemi, M. Uchida, R. Yamamura, T. Yorita
We report the measurement of differential cross sections for $\omega$ and $\eta'$ photoproduction from protons at backward angles ($-1.0<\cos\Theta_{C.M}^{X}<-0.8$) using linearly polarized photons at $E_{\gamma}=$$1.5-3.0$ GeV. Differential cross sections for $\omega$ 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 $\omega$ 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.
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http://arxiv.org/abs/1306.3031
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