Backward-angle photoproduction of $\pi^0$ mesons on the proton at $E_\gamma$ = 1.5--2.4 GeV

A. Sakaguchi; A. Wakai; C. Rangacharyulu; C.W. Wang; D.S. Oshuev; H. Akimune; H. Ejiri; H. Fujimura; H. Kawai; H. Kohri

arxiv: 0708.1600 · v1 · submitted 2007-08-12 · ⚛️ nucl-ex

Backward-angle photoproduction of π⁰ mesons on the proton at E_γ = 1.5--2.4 GeV

M. Sumihama , J.K. Ahn , H. Akimune , Y. Asano , W.C. Chang , S. Dat\'e , H. Ejiri , H. Fujimura

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M. Fujiwara K. Hicks T. Hotta K. Imai T. Ishikawa T. Iwata H. Kawai Z.Y. Kim K. Kino H. Kohri N. Kumagai S. Makino T. Matsumura N. Matsuoka T. Mibe M. Miyabe Y. Miyachi M. Morita N. Muramatsu T. Nakano M. Niiyama M. Nomachi Y. Ohashi H. Ohkuma T. Ooba D.S. Oshuev C. Rangacharyulu A. Sakaguchi T. Sato P.M. Shagin Y. Shiino H. Shimizu Y. Sugaya H. Toyokawa A. Wakai C.W. Wang S.C. Wang K. Yonehara T. Yorita M. Yosoi R.G.T. Zegers

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keywords beengammaanglesasymmetriesbackwardbeamchannelcross

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Differential cross sections and photon beam asymmetries for $\pi^0$ photoproduction have been measured at $E_\gamma$ = 1.5--2.4 GeV and at the $\pi^0$ scattering angles, --1 $<$ cos$\Theta_{c.m.} <$ --0.6. The energy-dependent slope of differential cross sections for $u$-channel $\pi^0$ production has been determined. An enhancement at backward angles is found above $E_\gamma$ = 2.0 GeV. This is inferred to be due to the $u$-channel contribution and/or resonances. Photon beam asymmetries have been obtained for the first time at backward angles. A strong angular dependence has been found at $E_\gamma >$ 2.0 GeV, which may be due to the unknown high-mass resonances.

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Backward-angle photoproduction of π⁰ mesons on the proton at E_γ = 1.5--2.4 GeV

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