Locations of Roberge-Weiss transition endpoints in lattice QCD with N_f=2 improved KS quarks

2016/12/11 by Liang-Kai Wu, Xiang-Fei Meng
Physics and Astronomy · #hep-lat

paper · pdf · doi:10.1103/physrevd.95.054503

published as Phys. Rev. D 95, 054503 (2017) · 8 pages, 16 figures. arXiv admin note: substantial text overlap with arXiv:1405.2425

arxiv created 2016/12/11 · arxiv updated 2017/03/15

Abstract

Result on the locations of the tricritical points of N_f=2 lattice QCD with imaginary chemical potential is presented. Simulations are carried out with Symanzik improved gauge action and Asqtad fermion action. With imaginary chemical potential iμ_I=iπT, previous studies show that the Roberge-Weiss (RW) transition endpoints are triple points at both large and small quark masses, and second order transition points at intermediate quark masses. The triple and second order endpoints are separated by two tricritical ones. Our simulations are carried out at 7 values of quark mass am ranging from 0.024 to 0.070 on lattice volume 12³× 4, 16³× 4, 20³×4. The susceptibility and Binder cumulant of the imaginary part of Polyakov loop are employed to determine the nature of RW transition endpoints. The simulations suggest that the two tricritical points are within the range 0.024-0.026 and 0.040-0.050, respectively.

Citations

• Nature of Roberge-Weiss transition end points for heavy quarks in N_f=2 lattice QCD with Wilson fermions