Properties of mesons and critical points in the Nambu–Jona-Lasinio model with different regularizations

The properties of mesons and the thermodynamics of the system in the Nambu–Jona-Lasinio model with different regularizations are considered. The effect of the regularization scheme and parameter sets on the phase diagram of matter is studied. It is noted that the first-order phase transition in the system may vanish if a certain parameter set is used in the Nambu–Jona-Lasinio model with the Pauli–Villars regularization.