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arXiv 1902.02835hep-ph
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重夸克偶素谱中的阈值效应

Threshold effects in heavy quarkonium spectroscopy

J. Ferretti

摘要:

在这篇文章中,我们讨论了连续耦合(或阈值)效应在重夸克偶素光谱中的可能重要性。我们的计算是在耦合通道模型中进行的,其中通过对产生机制在$Q \bar Q$裸介子波函数中引入介子-介子高Fock(或分子型)分量.在简要介绍了耦合通道模型的主要特征后,我们简要讨论了它在计算重类夸克$χ_{\rm c}(2P)$和带阈值修正的$χ_{\rm b}(3P)$态质量中的应用.结果表明,在夸克模型(QM)中引入对生效应,可以解释$χ_{\rm c}(2P)$态质量与实验值的偏差,而不影响QM对$χ_{\rm b}(3P)$态性质的良好描述.

英文摘要:

In this contribution, we discuss the possible importance of continuum-coupling (or threshold) effects in heavy quarkonium spectroscopy. Our calculations are carried out in a coupled-channel model, where meson-meson higher Fock (or molecular-type) components are introduced in $Q \bar Q$ bare meson wave functions by means of a pair-creation mechanism. After providing a quick resume of the main characteristics of the coupled-channel model, we briefly discuss its application to the calculation of the masses of heavy quarkonium-like $χ_{\rm c}(2P)$ and $χ_{\rm b}(3P)$ states with threshold corrections. We show that the introduction of pair-creation effects in the Quark Model (QM) formalism makes it possible to explain the deviations of $χ_{\rm c}(2P)$ states' masses from the experimental data, without affecting the good QM description of the properties of $χ_{\rm b}(3P)$ states.

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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