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arXiv · 1805.07096

A new decay mode of higher charmonium

Li-Ye Xiao·Xin-Zhen Weng·Qi-Fang Lü·Xian-Hui Zhong·Shi-Lin Zhu
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Abstract

We calculate the $Λ_c\barΛ_c$ partial decay width of the excited vector charmonium states around 4.6 GeV with the quark pair creation model. We find that the partial decay width of the $Λ_c\barΛ_c$ mode can reach up to several MeV for $ψ(4S,~5S,~6S)$. In contrast, the partial $Λ_c\barΛ_c$ decay width of the states $ψ(3D,~4D,~5D)$ is less than one MeV. If the enhancement $Y(4630)$ reported by the Belle Collaboration in $Λ_c\barΛ_c$ invariant-mass distribution is the same structure as $Y(4660)$, the $Y(4660)$ resonance is most likely to be a $S$-wave charmonium state.

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Li-Ye Xiao, Xin-Zhen Weng, Qi-Fang Lü, Xian-Hui Zhong, Shi-Lin Zhu. 2018-05-18. A new decay mode of higher charmonium. https://doi.org/10.1140/epjc%2Fs10052-018-6087-3

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