Spectroscopy of hidden-heavy tetraquark states with $J^{PC}=0^{--}$ in a color-octet configuration

TL;DR

This study uses QCD sum rules to predict the existence and masses of exotic hidden-heavy tetraquark states with quantum number $J^{PC}=0^{--}$ in color-octet configurations, guiding future experimental searches.

Contribution

It constructs specific interpolating currents and performs sum rule analysis to identify potential $0^{--}$ tetraquark candidates in both charm and bottom sectors, highlighting their distinctive properties.

Findings

Four hidden-bottom $0^{--}$ tetraquark candidates predicted at 10.8–11.1 GeV.

Hidden-charm partners predicted around 4.3–4.6 GeV.

Mass patterns suggest a compact structure with mild dependence on color configuration.

Abstract

Within the framework of QCD sum rules, we investigate hidden-heavy tetraquark states with the exotic quantum number $J^{PC}=0^{--}$ in color-octet configurations, namely $[Q\bar q]_{8_c}\otimes[q\bar Q]_{8_c}$ and $[Q\bar Q]_{8_c}\otimes[\bar q q]_{8_c}$ with $Q=c,b$. Since the $0^{--}$ quantum number cannot be realized by conventional $q\bar q$ mesons, the observation of such a state would provide a particularly clean signal for exotic hadronic structures. We construct four color-octet interpolating currents for the hidden-heavy systems and carry out the operator product expansion up to dimension-eight condensates. Our numerical analysis indicates that the hidden-bottom sector exhibits the clearest sum-rule stability, with flatter Borel platforms than the corresponding hidden-charm sector. We obtain four $0^{--}$ hidden-bottom tetraquark candidates in the mass range $10.8$--$11.1~\mathrm{GeV}$, while their hidden-charm partners are predicted around $4.3$--$4.6~\mathrm{GeV}$. The extracted masses suggest a compact spectral pattern with a mild dependence on the underlying color-octet clustering structure. We also discuss possible decay patterns and emphasize that the absence of the lowest pseudoscalar--pseudoscalar heavy-meson channels is a distinctive consequence of the exotic $0^{--}$ assignment. These results provide useful theoretical guidance for future searches for hidden-heavy exotic states at Belle II and LHCb, with complementary probes of the hidden-charm partners at BESIII.