2015/04/30 by Xiao-Yong Jin, Yoshinobu Kuramashi, Y. Kuramashi +4 · 7 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Condensed matter physics #Critical line #Curvature #Deconfinement #Fermion #Geometry #High-Energy Particle Collisions Research #Particle physics #Phase transition #Physics #Plane (geometry) #Pseudoscalar #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Quark #hep-lat #nucl-ex
paper · pdf · doi:10.1103/physrevd.92.114511
published in Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 92(11) (American Physical Society) · 18 pages, 8 figures
arxiv created 2015/12/19 · openalex publication_date 2015/12/22 · arxiv updated 2015/12/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We investigate the phase structure of three-flavor QCD in the presence of finite quark chemical potential \ensuremathμ/T\ensuremath\lesssim1.2 by using the nonperturbatively O(a) improved Wilson fermion action on lattices with a fixed temporal extent Nt=6 and varied spatial linear extents Ns=8, 10, 12. Especially, we focus on locating the critical end point that characterizes the phase structure, and extracting the curvature of the critical line on the \ensuremathμ\text\ensuremath-m_\ensuremathπ plane. For Wilson-type fermions, the correspondence between bare parameters and physical parameters is indirect. Hence we present a strategy to transfer the bare parameter phase structure to the physical one, in order to obtain the curvature. Our conclusion is that the curvature is positive. This implies that, if one starts from a quark mass in the region of crossover at zero chemical potential, one would encounter a first-order phase transition when one raises the chemical potential.