Fully heavy tetraquark resonant states with different flavors

We use the quark potential model to calculate the mass spectrum of the S-wave fully heavy tetraquark systems with different flavors, including the bc b c, bb c c, cc c b and bb b c systems. We employ the Gaussian expansion method to solve the four-body Schr\"odinger equation, and the complex scaling method to identify resonant states. The bc b c, bb c c, cc c b and bb b c resonant states are obtained in the mass regions of (13. 2, 13. 5), (13. 3, 13. 6), (10. 0, 10. 3), (16. 5, 16. 7) GeV, respectively. Among these states, the bc b c tetraquark states are the most promising ones to be discovered in the near future. We recommend the experimental exploration of the 1^++ and 2^++ bc b c states with masses near 13. 3 GeV in the J/ channel. From the root-mean-square radii, we find that all the resonant states we have identified are compact tetraquark states.