  We study the critical point in the QCD phase diagram in the Nambu-Jona-Lasino
(NJL) model by including a scalar-vector coupled interaction. We find that
varying the strength of this interaction, which has no effect on the vacuum
properties of QCD, can significantly affect the location of the critical point
in the QCD phase diagram, particularly the value of the cirtical temperature.
This provides a convenient way to use the NJL-based transport or hydrodynamic
model to extract information about the QCD phase diagram from relativistic
heavy-ion collisions.
