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arXiv 0708.1600nucl-ex
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$E_γ$ = 1.5- 2.4 GeV质子上$π^0$介子的后角光生

Backward-angle photoproduction of $π^0$ 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. Daté, H. Ejiri, H. Fujimura, M. Fujiwara, K. Hicks, T. Hotta, K. Imai, T. Ishikawa, T. Iwata, H. K… 展开作者

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. 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

摘要:

在$E_γ$ = 1.5- 2.4 GeV和$π^0$散射角为-1 $<$ cos $Θ_{c.m.} <$ -0.6时测量了$π^0$光生的微分截面和光子束不对称性。已经确定了$u$ -通道$π^0$产生的微分截面的能量依赖性斜率。在$E_γ$ = 2.0 GeV以上发现后向角的增强。这被推断为是由于$u$通道贡献和/或共振。光子束的不对称性已经获得了第一次在向后的角度。在$E_γ>$ 2.0 GeV处发现了很强的角度依赖性,这可能是由于未知的高质量共振。

英文摘要:

Differential cross sections and photon beam asymmetries for $π^0$ photoproduction have been measured at $E_γ$ = 1.5--2.4 GeV and at the $π^0$ scattering angles, --1 $<$ cos$Θ_{c.m.} <$ --0.6. The energy-dependent slope of differential cross sections for $u$-channel $π^0$ production has been determined. An enhancement at backward angles is found above $E_γ$ = 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 $E_γ>$ 2.0 GeV, which may be due to the unknown high-mass resonances.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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