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arXiv 1302.4790hep-ph
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一种可能的NN *(1440)准分子态

A possible NN*(1440) quasi-molecular state

Lu Zhao, Peng-Nian Shen, Ying-Jie Zhang, Bing-Song Zou

摘要:

受最近在p+n到d + π0 + π0截面中观察到的2360 MeV附近的窄共振结构的启发,利用一个介子交换模型,考虑了t和u通道中的π,σ,ρ和ω交换,研究了形成NN*(1440)准分子态的可能性.采用从NN散射和N ~*(1440)衰变数据中提取的耦合常数,发现NN ~*(1440)能形成类氘准分子态,结合能在2 ~ 67 MeV范围内。因此,推测在2360 MeV附近观察到的结构可能是或可能具有NN*(1440)准分子态的大分量。

英文摘要:

Inspired by the recent observation of a narrow resonance-like structure around 2360 MeV in the p+n to d + π0 + π0 cross section, the possibility of forming a NN*(1440) quasi-molecular state is investigated by using a meson exchange model in which the π, σ, ρ and ω exchanges in t- and u-channels are considered. By adopting the coupling constants extracted from the relevant NN scattering and N*(1440) decay data, it is found that a deuteron-like quasi-molecular state of NN*(1440) with a binding energy in the range of from 2 to 67MeV can be formed. Therefore, it is speculated that the observed structure around 2360 MeV might be or may have a large component of the NN*(1440) quasi-molecular state.

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