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arXiv · 1912.03610

Light-quark components analysis and the nature of the $Y(4260)$

Yun-Hua Chen·Ling-Yun Dai·Feng-Kun Guo·Bastian Kubis
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Abstract

We study the processes $e^+ e^- \to Y(4260) \to J/\psi \pi\pi(K\bar{K})$. The strong final-state interactions, especially the coupled-channel ($\pi\pi$ and $K\bar{K}$) final-state interaction in the $S$-wave are taken into account in a model-independent way using dispersion theory. It is found that the light-quark SU(3) octet state plays a significant role in these transitions, implying that the $Y(4260)$ contains a large light-quark component. Our findings suggest that the $Y(4260)$ is neither a hybrid nor a conventional charmonium state. Furthermore, through an analysis of the ratio of the light-quark SU(3) octet and singlet components, we show that the $Y(4260)$ does not behave like a pure $\bar D D_1$ hadronic molecule as well.

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Yun-Hua Chen, Ling-Yun Dai, Feng-Kun Guo, Bastian Kubis. 2019-12-08. Light-quark components analysis and the nature of the $Y(4260)$. https://arxiv.org/abs/1912.03610

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