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arXiv 1901.02564hep-phhep-ex
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全重四夸克

All-heavy tetraquarks

Ming-Sheng Liu, Qi-Fang Lü, Xian-Hui Zhong, Qiang Zhao

摘要:

在本文中,我们在一个势模型中,通过引入线性约束势、库仑势和自旋-自旋相互作用,研究了全重四夸克系统$cc\bar{c}\bar{c}$、$bb\bar{b}\bar{b}$、$bb\bar{c}\bar{c}/cc\bar{b}\bar{b}$、$bc\bar{c}\bar{c}/cc\bar{b}\bar{c}$、$bc\bar{b}\bar{b}/bb\bar{b}\bar{c}$和$bc\bar{b}\bar{c}$的质量谱。结果表明,线性束缚势对质量有重要贡献,对我们理解全重四夸克态系统的质量谱至关重要。对于全重四夸克$Q_1Q_2\bar{Q}_3\bar{Q}_4$,我们的计算表明,在任何介子对$(Q_1\bar{Q}_3)$ - $(Q_2\bar{Q}_4)$或$(Q_1\bar{Q}_4)$ - $(Q_2\bar{Q}_3)$的阈值之下都不能形成束缚态。因此,我们不期望在实验中存在窄的全重四夸克态。

英文摘要:

In this work we study the mass spectra of the fully-heavy tetraquark systems, i.e. $cc\bar{c}\bar{c}$, $bb\bar{b}\bar{b}$, $bb\bar{c}\bar{c}/cc\bar{b}\bar{b}$, $bc\bar{c}\bar{c}/cc\bar{b}\bar{c}$, $bc\bar{b}\bar{b}/bb\bar{b}\bar{c}$, and $bc\bar{b}\bar{c}$, within a potential model by including the linear confining potential, Coulomb potential, and spin-spin interactions. It shows that the linear confining potential has important contributions to the masses and is crucial for our understanding of the mass spectra of the fully-heavy tetraquark systems. For the fully-heavy tetraquarks $Q_1Q_2\bar{Q}_3\bar{Q}_4$ our explicit calculations suggest that no bound states can be formed below the thresholds of any meson pairs $(Q_1\bar{Q}_3)$-$(Q_2\bar{Q}_4)$ or $(Q_1\bar{Q}_4)$-$(Q_2\bar{Q}_3)$. Thus, we do not expect narrow fully-heavy tetraquark states to be existing in experiments.

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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