三体计算中的反K反K-N分子态
anti-K anti-K N molecule state in three-body calculation
摘要：
采用非相对论三体方法，利用有效的$\bar{K}N$和$\bar K \bar K$相互作用，研究了含有$I=1/2$和$J^P=1/2^+$的$\bar{K}\bar{K}N$系统.本研究表明，$\bar{K}\bar{K}N$系统的弱束缚态可以形成低于两体阈值的$\bar{K}$和准束缚$\bar{K}N$与$40 \sim 60$ MeV的衰变宽度为$\bar{K}\bar{K}N\to πY\bar{K}$。这对应于一个受激的$Ξ$重子，其$J^P=1/2^+$位于1.9 GeV附近。研究了该公式中得到的$\bar{K}\bar{K}N$体系的波函数，发现该三体束缚体系具有$\bar K N$ + $\bar K$团簇的特征结构.
英文摘要：
A $\bar{K}\bar{K}N$ system with $I=1/2$ and $J^P=1/2^+$ is investigated with non-relativistic three-body calculations by using effective $\bar{K}N$ and $\bar K \bar K$ interactions. The present investigation suggests that a weakly bound state for the $\bar{K}\bar{K}N$ system can be formed below the two-body threshold of $\bar{K}$ and quasibound $\bar{K}N$ with a $40 \sim 60$ MeV decay width of $\bar{K}\bar{K}N\to πY\bar{K}$. This corresponds to an excited $Ξ$ baryon with $J^P=1/2^+$ located around 1.9 GeV. Studying the wave function of the $\bar{K}\bar{K}N$ system obtained in this formulation, we find that the three-body bound system has a characteristic structure of $\bar K N$+$\bar K$ cluster with spatial extent.
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