Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2011-04-12
Phys.Rev.D83:114507,2011
Physics
High Energy Physics
High Energy Physics - Lattice
10 pages, 20 figures, 3 tables. Revtex4. References are added and, discussions are sharpened
Scientific paper
10.1103/PhysRevD.83.114507
The QCD phase diagram is studied in the lattice QCD simulation with the imaginary chemical potential approach. We employ a clover-improved Wilson fermion action of two-flavors and a renormalization-group improved gauge action, and perform the simulation at an intermediate quark mass on a $8^3\times 4$ lattice. The QCD phase diagram in the imaginary chemical potential $\mu_I$ region is investigated by performing the simulation for more than 150 points on the $(\beta,\mu_I)$ plane. We find that the Roberge-Weiss phase transition at $\mu_I/T=\pi/3$ is first order and its endpoint is second order, which are identified by the phase of the Polyakov loop. We determine the pseudo-critical line from the susceptibility of the Polyakov loop modulus. We find a clear deviation from a linear dependence of the pseudo-critical line on $\mu_I^2$.
Nagata Keitaro
Nakamura Atsushi
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