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arXiv 2107.08451hep-ph
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对称、伙伴和阈值:$X_b$的情况

Symmetries, partners and thresholds: the case of the $X_b$

Pablo G. Ortega, David R. Entem, Francisco Fernandez

摘要:

$X(3872)$的发现意味着重介子光谱学的复兴超越了原始的$q\bar q$结构。一旦在夸克模型的早期非常有用的$SU(3)$方案对这些态不起作用,人们就必须使用新的对称性,如重夸克自旋对称性(HQSS)和重味对称性(HFS),来寻找新的态。然而,在这些新状态出现的能量区域,涉及到新的因素,并且将对称性的预测与数据联系起来并不简单。在这项工作中,我们提出了一个关键的分析这个问题,并显示,在一个耦合通道模型,如何裸$Q\bar Q$状态相对于介子-介子阈值和耦合与其他通道调制的相互作用的强度,因此,修改预测状态的结构。我们在$/c^2$的$10599$ MeV处发现了一个可能的$X(3872)$伙伴候选者。

英文摘要:

The discovery of the $X(3872)$ meant the revival of the heavy meson spectroscopy beyond naive $q\bar q$ structures. Once that the $SU(3)$ scheme, which was very useful in the dawn of the quark models, does not work for these states, one has to use new symmetries, like Heavy Quark Spin Symmetry (HQSS) and Heavy Flavor Symmetry (HFS), to look for new states. However, at the energy regions where these new states appear, new factors are involved and it is not straightforward to relate the predictions of the symmetries with the data. In this work, we present a critical analysis of this problem and show, in a coupled-channels model, how the relative position of the bare $Q\bar Q$ states with respect to meson-meson thresholds and the coupling with other channels modulate the strength of the interaction and, hence, modify the structure of the predicted states. We found a possible candidate to the $X(3872)$ partner at $10599$ MeV$/c^2$.

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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