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The dilepton production yields in relativistic heavy ion collisions areinvestigated along isentropic trajectories in the quark (Wigner) phase withinthe two-flavor Nambu-Jona-Lasinio model. An enhancement of the ultra-low energydilepton yield in the vicinity of the color superconducting (CSC) phase and theQCD critical point (QCD-CP) is found, compared to the free quark gas.Furthermore, we have found a nontrivial structure in the beam energy dependenceof the ultra-low energy dilepton yield. A local maximum and minimum of thedilepton yield as a function of entropy per baryon emerge when the trajectoriesare close to both locations of the CSC phase transition line and the QCD-CP.Only the maximum appears in the scenario without the CSC phase but with theQCD-CP. On the other hand, when only the CSC phase is considered, the dileptonyield monotonically increases as the beam energy decreases. These distinctivepatterns could potentially serve as signals of the CSC phase and QCD-CP. Inaddition, it is found that the dilepton production yield and the location ofthe minimum strongly depend on the value of diquark coupling, suggesting thepossibility that the value of the diquark coupling may be extracted fromexperimental data.

Enhanced Dilepton production near the color superconducting phase and the QCD critical point