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

TL;DR

This study explores the phase diagram of 3-flavor QCD at finite temperature and density using Wilson-Clover fermions, employing reweighting techniques to locate the critical end point and analyze phase transitions.

Contribution

It introduces a strategy to relate bare parameters to physical parameters for Wilson-type fermions and investigates the phase structure at finite density.

Findings

The curvature with respect to chemical potential is positive.

A first-order phase transition is expected at higher chemical potentials.

The critical end point is identified using kurtosis intersection method.

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.