Study of charmoniumlike and fully-charm tetraquark spectroscopy

The masses of tetraquark states of all qc (q) over bar(c) over bar and cc (c) over bar(c) over bar quark configurations are evaluated in a constituent quark model, where the Cornell-like potential and one-gluon exchange spin-spin coupling are employed. All model parameters arc predetermined by comparing the theoretical and experimental masses of light, charmed and bottom mesons. The theoretical predictions of the charmoniumlike tetraquarks are compared with the observed XYZ states, and one tentative assignment is suggested. The work suggests that the X(6900) observed by LHCb is likely to be the first radial excited fully-charm tetraquark state with J(PC) = 1(+-) in the (3) over bar (c) circle times 3(c) configuration, and the ground and second radial excited states of fully-charm tetraquark are around 6494 and 7253 MeV respectively.

Automated summary

This study evaluates the masses of tetraquark states using a constituent quark model and pre-determined model parameters. The observed X(6900) by LHCb is suggested to be the first radial excited fully-charm tetraquark state.