S-wave fully charmed tetraquark resonant states

We calculate the mass spectrum of the S-wave fully-charmed tetraquark resonant states cc (c) over bar(c) over bar in the nonrelativistic quark model, which successfully describes the charmonium spectrum. The four-body system is solved with the Gaussian expansion method. The complex scaling technique is used to identify the genuine resonances. With the nonrelativistic quark model, our results show the existence of two cc (c) over bar(c) over bar resonances in each of the J(PC)= 0(++), 1(+-), and 2(++) sectors, respectively. In the S-wave sector, no resonance is found at the energy region of the Xo6200THORN and Xo6600THORN states. The lower 0thornthorn and 2thornthorn resonances are located around 100 MeV higher than the Xo6900THORN state observed in experiments but have the decay widths consistent with the experiment. The higher 0(++) and 2(++) resonances are found at around 7.2 GeV with the widths of 60.6 MeVand 91.2 MeV, respectively, and they may be good candidates for the X(7200)state.

Automated summary

In this study, we calculate the mass spectrum of the S-wave fully-charmed tetraquark resonant states using the nonrelativistic quark model and identify the genuine resonances with the complex scaling technique. The results show the existence of two resonances in each J(PC) sector, and the higher resonances may be good candidates for the X(7200) state.