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

M. Sumihama, J. K. Ahn, H. Akimune, Y. Asano, W. C. Chang, S. Daté, H. Ejiri, H. Fujimura, M. Fujiwara, K. Hicks, T. Hotta, K. Imai, T. Ishikawa, T. Iwata, H. Kawai, Z. Y. Kim, K. Kino, H. Kohri, N. Kumagai, S. MakinoT. 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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21 Scopus citations


Differential cross sections and photon beam asymmetries for π0 photoproduction have been measured at Eγ = 1.5 - 2.4  GeV and at the π0 scattering angles, - 1 < cos Θc . m . < - 0.6. The energy-dependence of differential cross sections for u-channel π0 production has been determined. An enhancement at backward angles is found above Eγ = 1.9  GeV. This is likely to be due to u-channel diagrams. Photon beam asymmetries have been obtained for the first time at backward angles, showing a strong angular dependence at Eγ > 2.0  GeV.

Original languageEnglish
Pages (from-to)32-37
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-3
StatePublished - 29 Nov 2007


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