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Study of the critical point in lattice QCD at high temperature and density

Presenter: Shinji Ejiri — Brookhaven National Laboratory

Shinji Ejiri

We propose a method to probe the nature of phase transition for lattice QCD at finite temperature and density, which is based on the investigation of an effective potential as a function of the average plaquette. We analyze the data obtained by a simulation of two-flavor QCD with p4-improved staggered quarks, and find that a first order phase transition line appears in the high density regime. We moreover discuss the difference between the phase structures with non-zero quark chemical potential and non-zero isospin chemical potential.