Searching for fully-heavy tetraquark states in QCD moment sum rules

In this talk, we briefly report the investigations of the mass spectra for the ccc over bar c over bar , bbb over bar b over bar , bcb over bar c over bar and ccb over bar b over bar tetraquark states by using the QCD moment sum rule method. The calculations for the fully-charm ccc over bar c over bar tetraquarks have been successfully predicted the existence of di-J/psi resonances including X(6900) in LHCb's observation. The quantum numbers for these resonance structures are also suggested. More efforts are still needed in both theoretical and experimental aspects to study the properties of these fully-heavy tetraquark states. They may be observed at facilities such as LHCb, CMS and RHIC in the future.

Automated summary

This talk briefly reports on the investigations of mass spectra for tetraquark states using the QCD moment sum rule method. The existence of fully-charm tetraquarks, including the observation of X(6900) di-J/psi resonances in LHCb, has been successfully predicted. Quantum numbers for these resonance structures have also been suggested. More efforts are needed in both theoretical and experimental aspects to study the properties of these fully-heavy tetraquark states.