Backward-angle photoproduction of ω and η' mesons from protons at E_{γ}=1.5-3.0 GeV

Y.Morino , Y.Nakatsugawa , M.Yosoi , M.Niiyama , D.S.Ahn , J.K.Ahn , S.Ajimura , W.C.Chang

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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

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keywords crossdifferentialmesonsomegasectionssqrtchannelcontribution

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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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Backward-angle photoproduction of ω and η' mesons from protons at E_{γ}=1.5-3.0 GeV

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