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 yield mass predictions of 10.8-11.1 GeV for four hidden-bottom 0-- tetraquarks and 4.3-4.6 GeV for their hidden-charm partners in color-octet setups.
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.
No signals found for X(3872) to K_S^0 K^± π^∓ or K*(892) K-bar; upper limits on branching fractions relative to π+π- J/ψ are <0.07 and <0.10 at 90% CL.
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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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Spectroscopy of hidden-heavy tetraquark states with $J^{PC}=0^{--}$ in a color-octet configuration
QCD sum rules yield mass predictions of 10.8-11.1 GeV for four hidden-bottom 0-- tetraquarks and 4.3-4.6 GeV for their hidden-charm partners in color-octet setups.
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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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Search for the decays $X(3872)\to K_{S}^{0}K^{\pm}\pi^{\mp}$ and $K^*(892)\bar{K}$ at BESIII
No signals found for X(3872) to K_S^0 K^± π^∓ or K*(892) K-bar; upper limits on branching fractions relative to π+π- J/ψ are <0.07 and <0.10 at 90% CL.