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arXiv · 2010.07719

$0^{+}$ fully-charmed tetraquark states

Jian-Rong Zhang
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Abstract

Motivated by the LHCb's new observation of structures in the $J/\psi$-pair invariant mass spectrum, for which could be classified as possible $cc\bar{c}\bar{c}$ tetraquark candidates, we systematically study $0^{+}$ fully-charmed tetraquark states through QCD sum rules. Making the development of calculation techniques to fourfold heavy hadronic systems, four different configuration currents with $0^{+}$ are considered and vacuum condensates up to dimension $6$ are included in the operator product expansion (OPE). Finally, mass values acquired for $0^{+}$ $cc\bar{c}\bar{c}$ tetraquark states agree well with the experimental data of the broad structure, which supports that it could be a $0^{+}$ fully-charmed tetraquark state.

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Jian-Rong Zhang. 2020-10-15. $0^{+}$ fully-charmed tetraquark states. https://doi.org/10.1103/physrevd.103.014018

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