Role of the Chiral Phase Transition in Modelling the Kaon-to-Pion Ratio

A sharp peak in the K⁺/π⁺ ratio in relativistic heavy-ion collision is discussed in the framework of the SU(3) Polyakov-loop extended Nambu-Jona-Lasinio model with vector interaction. In the model, the K⁺/π⁺ ratio has been calculated along the chiral phase transition line for different values of the vector coupling g_V. It has been shown that the value of the vector coupling hardly affects the behavior of the K⁺/π⁺ ratio.