Hidden-charm and -bottom tetraquark states with $J^{PC}=1^{-+}$ via QCD sum rules

Abstract

We investigate the $1^{-+}$ hidden-charm and hidden-bottom tetraquark states within the framework of QCD sum rules. The mass spectra are computed by including condensates up to dimension eight in the operator product expansion. Our results indicate the possible existence of four $1^{-+}$ hidden-charm tetraquark states, with predicted masses of $(4.83\pm 0.15)$ GeV, $(4.88\pm 0.18)$ GeV, $(4.72\pm 0.16)$ GeV, and $(4.79\pm 0.12)$ GeV, while their hidden-bottom counterparts are estimated to have masses of $(11.08\pm 0.16)$ GeV, $(11.16\pm 0.14)$ GeV, $(10.99\pm 0.16)$ GeV, and $(11.03\pm 0.15)$ GeV, respectively. We also analyze the possible decay modes of these tetraquark states, which may be accessible in future experiments at BESIII, Belle~II, LHCb, and future STCF. These findings provide valuable guidance for the experimental search for exotic $1^{-+}$ tetraquark states in both the charm and bottom sectors.