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arXiv · 2006.16027

Strong decays of fully-charm tetraquarks into di-charmonia

Hua-Xing Chen·Wei Chen·Xiang Liu·Shi-Lin Zhu
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Abstract

We study strong decays of the possible fully-charm tetraquarks recently observed by LHCb, and calculate their relative branching ratios through the Fierz rearrangement. Together with our previous QCD sum rule study [Phys. Lett. B 773, 247 (2017)], our results suggest that the broad structure around $6.2$-$6.8$ GeV can be interpreted as an $S$-wave $cc\bar c \bar c$ tetraquark state with $J^{PC} = 0^{++}$ or $2^{++}$, and the narrow structure around 6.9 GeV can be interpreted as a $P$-wave one with $J^{PC} = 0^{-+}$ or $1^{-+}$. These structures were observed in the di-$J/ψ$ invariant mass spectrum, and we propose to confirm them in the di-$η_c$, $J/ψh_c$, $η_c χ_{c0}$, and $η_c χ_{c1}$ channels. We also propose to search for their partner states having the negative charge-conjugation parity in the $J/ψη_c$, $J/ψχ_{c0}$, $J/ψχ_{c1}$, and $η_c h_c$ channels.

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Hua-Xing Chen, Wei Chen, Xiang Liu, Shi-Lin Zhu. 2020-08-30. Strong decays of fully-charm tetraquarks into di-charmonia. https://doi.org/10.1016/j.scib.2020.08.038

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