QCD sum rule analysis predicts six stable gluonic hidden-charm tetraquark states with J^PC = 0^{±±} and estimates masses for their hidden-bottom partners.
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QCD sum rules predict masses of 4.72-4.88 GeV for four hidden-charm 1^{-+} tetraquarks and 10.99-11.16 GeV for their hidden-bottom counterparts.
QCD sum rules with local meson-meson currents for the K(1690) consistently predict masses around 2 GeV or above, disfavoring a molecular interpretation in favor of a compact multiquark state.
citing papers explorer
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Spectrum of $J^{PC} = 0^{\pm\pm}$ Gluonic Hidden-Charm Tetraquark States
QCD sum rule analysis predicts six stable gluonic hidden-charm tetraquark states with J^PC = 0^{±±} and estimates masses for their hidden-bottom partners.
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Hidden-charm and -bottom tetraquark states with $J^{PC}=1^{-+}$ via QCD sum rules
QCD sum rules predict masses of 4.72-4.88 GeV for four hidden-charm 1^{-+} tetraquarks and 10.99-11.16 GeV for their hidden-bottom counterparts.
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QCD sum rule analysis of local meson-meson currents for the $K(1690)$ state
QCD sum rules with local meson-meson currents for the K(1690) consistently predict masses around 2 GeV or above, disfavoring a molecular interpretation in favor of a compact multiquark state.