研究了J/Ψ→ p(p-)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→ p(p-)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→ p(p-)η和 p(p-)η研究N*时,核子极点图的贡献可忽略不计; 在通过J/Ψ→ p(p-)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→ N(N-)M 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→N(N-)π decay,ignorable in the J/Ψ→N(N-)η and Nη' decays,and sizable in the J/Ψ→N(N-)ω decay.
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