0+ fully-charmed tetraquark states
Abstract
Motivated by the LHCb's new observation of structures in the J/-pair invariant mass spectrum, for which could be classified as possible cccc 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+ cccc 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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