Locations of Roberge-Weiss transition endpoints in lattice QCD with Nf=2 improved Kogut-Susskind quarks

Result on locations of the tricritical points of Nf=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 iμI=iπT, previous studies show that the Roberge-Weiss (RW) tr...

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Bibliographic Details
Published in:Physical review. D 2017-03, Vol.95 (5), p.054503
Main Authors: Wu, Liang-Kai, Meng, Xiang-Fei
Format: Article
Language:English
Subjects:
Chemical potential
Organic chemistry
Quantum chromodynamics
Quarks
Simulation
Transition points
Online Access:Get full text
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Summary:Result on locations of the tricritical points of Nf=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 iμI=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 the 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.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.95.054503