Searching for fully-heavy tetraquark states in QCD moment sum rules
Abstract
In this talk, we briefly report the investigations of the mass spectra for the cc c c, bb b b, bc b c and cc b b tetraquark states by using the QCD moment sum rule method. The calculations for the fully-charm cc c c tetraquarks have been successfully predicted the existence of di-J/ 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.
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