Speaker
Описание
In this talk, I will introduce our investigations on the fully-heavy tetraquark states, including the calculations of their mass spectra and their strong decays into di-charmonia. Our calculations of the masses for the fully-heavy tetra quarks have been done several years before the recent LHCb's observation in the di-$J/\psi$ structure. However, our results suggest that the broad structure around 6.2-6.8 GeV in LHCb's observation can be interpreted as an S-wave $cc\bar c\bar c$ tetraquark with $J^{PC}=0^{++}$ or $2^{++}$, and the narrow structure around 6.9 GeV can be interpreted as a P-wave one with $J^{PC}=0^{-+}$ or $1^{-+}$. These conclusions are also confirmed by our recent study of the strong decays of the fully-charm tetraquarks into di-charmonia, in which we consider all possible two-body strong decays for these tetrequarks and calculate their relative branching ratios through the Fierz rearrangement.
