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arXiv 2003.12407hep-phhep-lat
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重-轻四夸克态中不同结构的解纠缠

Disentangling different structures in heavy-light four-quark states

Paul C. Wallbott, Gernot Eichmann, Christian S. Fischer

备注：
10 pages, 4 figures, v2: minor corrections, version published in PRD rapid communications
发表信息：
Phys. Rev. D 102, 051501 (2020)
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摘要：

最近发现的用于解释重-轻四夸克态的模型已经假定了某些内部结构，即（反）夸克组分被分组为双夸克/反双夸克团簇、重介子/轻介子团簇（重夸克偶素）或重-轻介子分子。我们提出并使用一种基于Dyson-Schwinger和Bethe-Salpeter方程的四夸克态方法，该方法具有区分这些模型的潜力。用$q=u,d,s$和量子数$I(J^{PC})=0(1^{++}),1(1^{+-}),0(0^{++})$和$1(0^+),0(1^+),1(1^+)$研究了重轻$cq\bar{q}\bar{c}$和$cc\bar{q}\bar{q}$四夸克态的质量。我们确定这些量子数的基态的主要成分，并建议相应的实验状态的候选人。最值得注意的是，我们发现在所有的$cq\bar{q}\bar{c}$态中，都存在强的重-轻介子-介子和可以忽略的双夸克-反双夸克成分，而在$cc\bar{q}\bar{q}$态中，存在双夸克。$I=0$通道中的一个潜在警告是，包含$c\bar{c}$组件是必要的，但成本很高，这些组件将被移交给未来的工作。

英文摘要：

Models proposed to explain recently discovered heavy-light four-quark states already assume certain internal structures, i.e. the (anti)quark constituents are grouped into diquark/antidiquark clusters, heavy-meson/light-meson clusters (hadrocharmonium) or heavy-light meson molecules. We propose and use an approach to four-quark states based on Dyson-Schwinger and Bethe-Salpeter equations that has the potential to discriminate between these models. We study the masses of heavy-light $cq\bar{q}\bar{c}$ and $cc\bar{q}\bar{q}$ four-quark states with $q=u,d,s$ and quantum numbers $I(J^{PC})=0(1^{++}),1(1^{+-}),0(0^{++})$ and $1(0^+),0(1^+),1(1^+)$. We identify the dominant components of the ground states with these quantum numbers and suggest candidates for corresponding experimental states. Most notably, we find strong heavy-light meson-meson and negligible diquark-antidiquark components in all $cq\bar{q}\bar{c}$ states, whereas for $cc\bar{q}\bar{q}$ states diquarks are present. A potential caveat in the $I=0$ channels is the necessary but costly inclusion of $c\bar{c}$ components which is relegated to future work.

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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