| 通过J/Ψ→NM衰变研究N~*时的核子极点效应 |
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| 引用本文： | 沈彭年,梁伟红,邹冰松.通过J/Ψ→NM衰变研究N~*时的核子极点效应[J].原子核物理评论,2004,21(2):96-98. |
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| 作者姓名： | 沈彭年 梁伟红 邹冰松 |
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| 作者单位： | 1中国科学院高能物理研究所,北京1000392广西师范大学物理系,广西桂林541004 3兰州国家重离子加速器实验室理论核物理中心,甘肃兰州730000 |
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| 摘 要： | 研究了J／Ψ→pp^-π衰变过程中核子极点图的贡献，特别是由离壳效应带来的贡献．发现衰变宽度对形状因子是敏感的．在通过用J／Ψ→pp^-π衰变研究N^*时，核子极点图作为背景道的贡献是非常重要的；在通过J／Ψ→pp^-η和pp^-η研究N^*时，核子极点图的贡献可忽略不计；在通过J／Ψ→pp^-ω研究N^*时，核子极点图有明显的贡献． N-pole contributions, especially due to off shell effect, in J/Ψ→ NM decays are carefully studied. It is found that the decay width is sensitive to the form factor. The N pole contribution as a background is important in the J/Ψ→Nπ decay, ignorable in the J/Ψ→Nη and Nη' decays, and sizable in the J/Ψ→Nω decay.
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| 关 键 词： | J／Ψ衰变 核子激发态 核子极点效应 离壳效应 核子极点图 |
| 收稿时间： | 1900-01-01 |
N-pole Effect in
Studying N* via J/ |
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| Institution: | 1 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100039, China; 2 Department of Physics, Guangxi Normal University, Guilin 541004, Guangxi, China; 3 Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China |
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| Abstract: | N-pole contributions, especially due to off shell effect, in J/Ψ→ NM decays are carefully studied. It is found that the decay width is sensitive to the form factor. The N pole contribution as a background is important in the J/Ψ→Nπ decay, ignorable in the J/Ψ→Nη and Nη' decays, and sizable in the J/Ψ→Nω decay. |
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