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

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

2007-10-02

arxiv.org/abs/0710.0653v1

PoSLAT2007:181,2007

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 7 figures, talk presented at Lattice 2007

Scientific paper

We propose a method to probe the nature of phase transitions in 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 data obtained in a simulation of two-flavor QCD using p4-improved staggered quarks with bare quark mass $m/T = 0.4$, and find that a first order phase transition line appears in the high density regime for $\mu_q/T \sim 2.5$. The effective potential as a function of the quark number density is also studied. We calculate the chemical potential as a function of the density from the canonical partition function and discuss the existence of the first order phase transition line.

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