Continuum study of the QCD phase diagram through an OPE-modified gluon propagator

Within the Dyson-Schwinger equation framework, a gluon propagator model incorporating a quark's feedback through operator product expansion is introduced to investigate the QCD phase diagram in the temperature-chemical-potential (T-μ) plane. Partial restoration of chiral symmetry at zero temperature and finite temperature are both studied, suggesting a first order phase transition point on the μ axis and a critical end point at (TE,μE)/Tc=(0.85,1.11), where Tc is the pseudocritical temperature. In addition, we find the pseudocritical line can be well parametrized with the curvature parameter κ and a consistent decrease in κ, with more of the gluon propagator distributed to the quark's feedback.