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arXiv 1401.4431nucl-thhep-ph
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$X(3872)$和$χ_b(3P)$共振态的夸克结构

Quark structure of the $X(3872)$ and $χ_b(3P)$ resonances

J. Ferretti, G. Galatà, E. Santopinto

发表信息：
Phys. Rev. D90, 054010 (2014)
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摘要：

我们讨论了$χ_b(3P)$和$X(3872)$介子的性质：$χ_b(3P)$的标准$b \bar b$介子还是具有有意义连续分量的$b \bar b$态？$X(3872)$是连续耦合效应的$c \bar c$态还是介子-介子分子？为此，我们比较了夸克模型和非猝灭夸克模型对$χ_b(3P)$多重态的质量重心和分裂的计算结果。未来更精确的实验结果将区分这两种解释。对于$X(3872)$，我们认为它是一个$c \bar c$核加上由于与介子-介子连续体的耦合而产生的更高的Fock分量，因此我们认为它与介子$χ_{c1}(2P)$相容，具有$J^{PC} = 1^{++}$ . $J^{PC} = 1^{++}$量子数与LHCb合作发现的实验结果一致。在我们看来，由于自身能量的移动，$X(3872)$的质量低于夸克模型的预测。我们还提供了一个估计的$X(3872)$和$χ_b(3P)$介子，如$X(3872) \rightarrow D \bar D^*$和$χ_{b2}(3P) \rightarrow B \bar B$，和辐射跃迁的开放的魅力/底强衰变模式。

英文摘要：

We discuss the nature of the $χ_b(3P)$ and $X(3872)$ mesons: Are the $χ_b(3P)$'s standard $b \bar b$ mesons or $b \bar b$ states with a significative continuum component? Is the $X(3872)$ a $c \bar c$ state with continuum coupling effects or a meson-meson molecule? To do that, we compare quark model and unquenched quark model results for the mass barycenter and splittings of the $χ_b(3P)$ multiplet. Future and more precise experimental results will discriminate between the two interpretations. In the case of the $X(3872)$, we interpret it a $c \bar c$ core plus higher Fock components due to the coupling to the meson-meson continuum, thus we think that it is compatible with the meson $χ_{c1}(2P)$, with $J^{PC} = 1^{++}$. The $J^{PC} = 1^{++}$ quantum numbers are in agreement with the experimental results found by the LHCb collaboration. In our view, the $X(3872)$'s mass is lower than the quark model's predictions because of self energy shifts. We also provide an estimation of the open charm/bottom strong decay modes of the $X(3872)$ and $χ_b(3P)$ mesons, such as $X(3872) \rightarrow D \bar D^*$ and $χ_{b2}(3P) \rightarrow B \bar B$, and radiative transitions.

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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