Phase structure of $N_{\mathrm{f}}=3$ QCD at finite temperature and density by Wilson-Clover fermions

Abstract

We investigate the phase structure of 3-flavor QCD in the presence of finite quark chemical potential by using Wilson-Clover fermions. To deal with the complex action with finite density, we adopt the phase reweighting method. In order to survey a wide parameter region, we employ the multi-parameter reweighting method as well as the multi-ensemble reweighting method. Especially, we focus on locating the critical end point that characterizes the phase structure. It is estimated by the kurtosis intersection method for the quark condensate. For Wilson-type fermions, the correspondence between bare parameters and physical parameters is indirect, thus we present a strategy to transfer the bare parameter phase structure to the physical one. We conclude that the curvature with respect to the chemical potential 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.

7 pages, 5 figures, The 33rd International Symposium on Lattice Field Theory 14-18 July 2015, Kobe ,Japan

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• Critical endpoint of finite temperature phase transition for three flavor QCD
• Winding expansion techniques for lattice QCD with chemical potential
• Curvature of the critical line on the plane of quark chemical potential and pseudo scalar meson mass for three-flavor QCD