Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-06-24
Phys.Rev.D84:056010,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
26 page, 13 figure, typo corrected, some references added and corrected, one figure updated, version accepted for publication
Scientific paper
10.1103/PhysRevD.84.056010
With the aim of setting constraints for the modeling of the QCD phase diagram, the phase structure of the two-flavor Polyakov-loop extended Nambu and Jona-Lasinio (PNJL) model is investigated in the range of imaginary chemical potentials ($\mu_\mathrm{I}$) and compared with available $N_f=2$ lattice QCD results. The calculations are performed using the advanced nonlocal version of the PNJL model with the inclusion of vector-type quasiparticle interactions between quarks, and with wave-function-renormalization corrections. It is demonstrated that the nonlocal PNJL model reproduces important features of QCD at finite $\mu_\mathrm{I}$, such as the Roberge-Weiss (RW) periodicity and the RW transition. Chiral and deconfinement transition temperatures for $N_f=2$ turn out to coincide both at zero chemical potential and at finite $\mu_\mathrm{I}$. Detailed studies are performed concerning the RW endpoint and its neighborhood where a first-order transition occurs.
Hell Thomas
Kashiwa Kouji
Weise Wolfram
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