Scalar fully-charm and bottom tetraquarks under extreme temperatures

Temperature-dependences of masses and current couplings of the ground state of the fully heavy tetraquarks and , composed of charm (c) and bottom (b) quarks and antiquarks with spin-parities are evaluated in the diquark–antidiquark picture using Thermal QCDSR including vacuum condensates up to dimension four. The calculated values for and tetraquark states at align well with the experimental data on the broad structures. Based on the numerical analyses around the critical temperature, the mass of the state decreases by compared to its vacuum state, while for its b partner, this percentage is approximately . For the decay constants, the reductions are approximately and , respectively. The precise exploration of tetraquark states awaits future scrutiny in upcoming experiments, including Belle II, Super-B, PANDA, and LHCb.