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In this article, we study the JPC=0⁺⁺ and 2⁺⁺ QQQ̄Q̄ tetraquark states with the QCD sum rules, and we obtain the predictions M_X(ccc̄c̄,0⁺⁺) =5.99± 0.08\,GeV , M_X(ccc̄c̄,2⁺⁺) =6.09± 0.08\,GeV , M_X(bbb̄b̄,0⁺⁺) =18.84± 0.09\,GeV and M_X(bbb̄b̄,2⁺⁺) =18.85± 0.09\,GeV , which can be confronted to the experimental data in the future. Furthermore, we illustrate that the diquark–antidiquark type tetraquark state can be taken as a special superposition of a series of meson–meson pairs and that it embodies the net effects.
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Zhi-Gang Wang (2017) studied this question.
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