论文标题
杆计数规则和XYZ指出
The pole counting rule and XYZ states
论文作者
论文摘要
极点计数规则是一种强大且与模型无关的方法，可将狭窄状态与辐射分子区分开。它已应用于$ x（6900）$，$ x_1（2900）$以及$ z_c（3900）$，$ x（3872）$，$ x（4660）$等$ x（6900）$的探索中。对于$ x_1（2900）$，分析表明它应该是$ \ bar {d} _1 k $分子，带有$ j^p = 1^ - $，而iso-singlet解释更有利。最后，注意到，几乎所有具有外来量子数的XYZ颗粒都可以解释为Hadronic分子。但是，$ x（3872）$更像是一个炭。
The pole counting rule is a powerful and model-independent method to distinguish a confining state from a hadronic molecule. It has been applied to the explorations of $X(6900)$, $X_1(2900)$ as well as $Z_c(3900)$, $X(3872)$, $X(4660)$, etc.. For $X(6900)$, both a confining state and a molecular state are not excluded, because lacking of enough data. For $X_1(2900)$, the analysis shows that it should be a $\bar{D}_1 K$ molecule, with $J^P=1^-$ and an iso-singlet interpretation is much more favorable. Finally, it is noted that almost all XYZ particles with exotic quantum numbers can be interpreted as hadronic molecules. The $X(3872)$ is, however, more like a charmonium.
