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We investigate the phase structure of 3-flavor QCD in the presence of finitequark chemical potential by using Wilson-Clover fermions. To deal with thecomplex action with finite density, we adopt the phase reweighting method. Inorder to survey a wide parameter region, we employ the multi-parameterreweighting method as well as the multi-ensemble reweighting method.Especially, we focus on locating the critical end point that characterizes thephase structure. It is estimated by the kurtosis intersection method for thequark condensate. For Wilson-type fermions, the correspondence between bareparameters and physical parameters is indirect, thus we present a strategy totransfer the bare parameter phase structure to the physical one. We concludethat the curvature with respect to the chemical potential is positive. Thisimplies that, if one starts from a quark mass in the region of crossover atzero chemical potential, one would encounter a first-order phase transitionwhen one raises the chemical potential.

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