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arXiv 2109.05243hep-ph
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三重四夸克态

Triply heavy tetraquark states

Xin-Zhen Weng, Wei-Zhen Deng, Shi-Lin Zhu

摘要:

在扩展的色磁模型框架下,我们系统地研究了$S$波$qQ\bar{Q}\bar{Q}$四夸克态的质量谱。它们的质谱主要由颜色相互作用决定。对于$qc\bar{c}\bar{c}$、$qb\bar{c}\bar{c}$和$qb\bar{b}\bar{b}$四夸克态,色相互作用更倾向于色-六重态$\ket{(qQ)^{6_{c}}(\bar{Q}\bar{Q})^{\bar{6}_{c}}}$而不是色-三重态$\ket{(qQ)^{\bar{3}_{c}}(\bar{Q}\bar{Q})^{3_{c}}}$.但是对于$qc\bar{b}\bar{b}$四夸克来说,色三重态更受青睐。我们没有发现低于两个赝标介子阈值的稳定态。具有$qQ\bar{b}\bar{b}$风味配置的最低轴向矢量状态可以是窄的。它们位于两个赝标介子的阈值之上,但由于角动量和宇称守恒,它们不能衰变到这些通道中。

英文摘要:

In the framework of an extended chromomagnetic model, we systematically study the mass spectrum of the $S$-wave $qQ\bar{Q}\bar{Q}$ tetraquarks. Their mass spectra are mainly determined by the color interaction. For the $qc\bar{c}\bar{c}$, $qb\bar{c}\bar{c}$ and $qb\bar{b}\bar{b}$ tetraquarks, the color interaction favors the color-sextet $\ket{(qQ)^{6_{c}}(\bar{Q}\bar{Q})^{\bar{6}_{c}}}$ configuration over the color-triplet $\ket{(qQ)^{\bar{3}_{c}}(\bar{Q}\bar{Q})^{3_{c}}}$ one. But for the $qc\bar{b}\bar{b}$ tetraquarks, the color-triplet configuration is favored. We find no stable states which lie below the thresholds of two pseudoscalar mesons. The lowest axial-vector states with the $qQ\bar{b}\bar{b}$ flavor configuration may be narrow. They lie just above the thresholds of two pseudoscalar mesons, but cannot decay into these channels because of the conservation of the angular momentum and parity.

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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