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

详细信息    查看全文

• 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.
• 关键词：Meson spectroscopy ; Exotic mesons
• 刊名：Physics Letters B
• 出版年：2007
• 出版时间：29 November 2007
• 年：2007
• 卷：657
• 期：1-3
• 页码：32-37
• 全文大小：283 K

文摘

Differential cross sections and photon beam asymmetries for π⁰ photoproduction have been measured at E_γ=1.5–2.4 GeV and at the π⁰ scattering angles, −1<cosΘ_c.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 E_γ=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 E_γ>2.0 GeV.