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arXiv 2005.06909hep-phhep-exhep-latnucl-exnucl-th
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QCD中的两极结构:事实,而不是幻想!

Two-pole structures in QCD: Facts, not fantasy!

Ulf-G. Meißner

摘要:

两极结构指的是PDG表中列出的光谱中的特定单个状态通常是两个状态。这个故事开始于$Λ(1405)$,在2001年,使用么正化手征微扰理论,观察到在复平面中有两个极点,一个接近$\bar{K}p$,另一个接近$πΣ$阈值。这后来被理解为结合SU(3)极限和群论的论点。同时考虑了导致两极结构的不同的么正化方法,显示出在极点位置上的一些扩散。这一事实现在是PDG书的一部分,尽管它还没有列在汇总表中。在这里,我将讨论开放式和批判性的审查方法,不能处理这个问题。在介子扇区中,一些激发的粲介子是这种两极结构的良好候选者。接下来,我将详细考虑$D_0^*(2300)$,它是该场景的另一个候选对象。结合有限体积下的格格点量子色动力学和手征幺正方法,强子谱合作组对耦合道$Dπ$,$Dη$,$I=1/2$散射的精确数据确实揭示了它的两极结构.进一步的国家在重介子部门与$I=1/2$表现出这种现象的预测,特别是在美介子部门。我还讨论了这些两极结构的关系和可能的分子性质的国家正在考虑。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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