  Three-component fermionic optical lattice systems are investigated in
dynamical mean-field theory for the Hubbard model. Solving the effective
impurity model by means of continuous-time quantum Monte Carlo simulations in
the Nambu formalism, we find that the $s$-wave superfluid state proposed
recently is indeed stabilized in the repulsively interacting case and appears
along the first-order phase boundary between the metallic and paired Mott
states in the paramagnetic system. The BCS-BEC crossover in the three-component
fermionic system is also addressed.
