论文标题
QCD中的两极结构：事实，而不是幻想！
Two-pole structures in QCD: Facts, not fantasy!
论文作者
论文摘要
两极结构是指频谱中PDG表中列出的特定单个状态通常是两个状态。故事始于$λ（1405）$，当时在2001年，当使用单位性手性扰动理论时，观察到复杂平面中有两个杆，一个杆接近$ \ bar {k} p $，另一个接近$πς$ threshold。随后将其结合在一起，将SU（3）限制和群体理论论点结合在一起。在同一时间内考虑了所有导致两极结构的不同单位化方法，显示了极点位置的一些扩散。这一事实现在是PDG书籍的一部分，尽管摘要表中尚未列出。在这里，我将讨论开放式末端，并严格审查无法处理此问题的方法。在梅森部门，一些激动的魅力介子是这种两极结构的良好候选者。接下来，我详细考虑$ d_0^*（2300）$，这是此情况的另一个候选人。将晶格QCD与有限量的手性统一方法相结合，这是耦合频道$dπ$，$dη$，$ d_s \ bar {k} $散射在Isospin $ i = 1/2 $ Channel中的确切数据确实揭示了其两杆的结构。预计，$ i = 1/2 $的重型介子部门的进一步状态是预测的，尤其是在美容媒体领域。我还讨论了这两极结构的关系以及所考虑的国家的可能分子性质。
The two-pole structure refers to the fact that particular single states in the spectrum as listed in the PDG tables are often two states. The story began with the $Λ(1405)$, when in 2001, using unitarized chiral perturbation theory, it was observed that there are two poles in the complex plane, one close to the $\bar{K}p$ and the other close to the $πΣ$ threshold. This was later understood combining the SU(3) limit and group-theoretical arguments. Different unitarization approaches that all lead to the two-pole structure have been considered in the mean time, showing some spread in the pole positions. This fact is now part of the PDG book, though it is not yet listed in the summary tables. Here, I will discuss the open ends and critically review approaches that can not deal with this issue. In the meson sector some excited charm mesons are good candidates for such a two-pole structure. Next, I consider in detail the $D_0^*(2300)$, that is another candidate for this scenario. Combining lattice QCD with chiral unitary approaches in the finite volume, the precise data of the Hadron Spectrum Collaboration for coupled-channel $Dπ$, $Dη$, $D_s\bar{K}$ scattering in the isospin $I=1/2$ channel indeed reveal its two-pole structure. Further states in the heavy meson sector with $I=1/2$ exhibiting this phenomenon are predicted, especially in the beauty meson sector. I also discuss the relation of these two-pole structures and the possible molecular nature of the states under consideration.
