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首页> 外文期刊>The European Physical Journal, A. Hadrons and Nuclei >Nucleon-pole contributions in the J/psi -> N(N)over-bar pi, p(p)over-bar eta, p(p)over-bar eta ' and p(p)over-bar omega decays
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Nucleon-pole contributions in the J/psi -> N(N)over-bar pi, p(p)over-bar eta, p(p)over-bar eta ' and p(p)over-bar omega decays

机译:J / psi中的核子极贡献-> N(N)超出pi,p(p)超出eta,p(p)超出eta'和p(p)超出Ω衰减

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摘要

Nucleon-pole contributions in the J/psi --> N (N) over bar pi, p (p) over bar eta, p (p) over bar eta' and p (p) over bar omega decays are re-studied. Different contributions due to PS-PS and PS-PV couplings in the pi-N interaction and the effects of NNpi form factors are investigated in the J/psi --> N (N) over bar pi decay channel. It is found that when the ratio of F-0/F-M takes a small value, without considering the NNpi form factor, the difference between PS-PS and PS-PV couplings is negligible. However, when the NNpi form factor is included, this difference is greatly enlarged. The resultant decay widths are sensitive to the form factors. As a conclusion, the nucleon-pole contribution as a background to the decay width is important in the J/psi --> N (N) over bar pi decay and must be considered. In the J/psi --> N (N) over bar eta and N (N) over bar eta' decays, its contribution is smaller by 0.1% with respect to the data. In the J/psi --> N (N) over bar omega decay, it provides a rather important contribution without considering form factors. But the contribution is suppressed greatly when adding the off-shell form factors. Comparing these results with data will help us to select a proper form factor for such kind of decay.
机译:重新研究了在pi上的J / psi-> N(N),在eta上的p(p),在eta'上的p(p)和在Ω衰变上的p(p)的核子极贡献。在bar pi衰减通道的J / psi-> N(N)中,研究了pi-N相互作用中PS-PS和PS-PV耦合产生的不同贡献以及NNpi形状因子的影响。可以发现,当 F-0 / F-M 的比值很小时,不考虑NNpi形状因数,PS-PS和PS-PV耦合之间的差异可忽略不计。但是,当包含NNpi形状因子时,此差异会大大扩大。最终的衰减宽度对形状因数敏感。得出的结论是,在衰减比pi上的J / psi-> N(N)中,作为衰减宽度背景的核子极点贡献非常重要,必须加以考虑。在bar / eta上的J / psi-> N(N)和bar-eta'上的N(N)衰减中,其贡献相对于数据要小0.1%。在欧米巴衰减的J / psi-> N(N)中,它在不考虑外形尺寸的情况下提供了相当重要的作用。但是,当添加脱壳形状因数时,其贡献被大大抑制了。将这些结果与数据进行比较将有助于我们为这种衰减选择合适的外形尺寸。

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