Finite T/\mu lattice QCD and the critical point

TL;DR

This paper investigates the phase structure of lattice QCD at finite temperature and chemical potential, locating the critical endpoint using reweighting techniques on staggered fermion lattices.

Contribution

It applies the overlap-improving multi-parameter reweighting method to determine the critical point in 2+1 flavor QCD at finite T and .

Findings

Locates the critical endpoint in the -T plane.

Uses semi-realistic quark masses on small lattices.

Analyzes thousands of configurations for robust results.

Abstract

We present results on lattice QCD at finite temperature (T) and chemical potential (\mu). We apply the overlap-improving multi-parameter reweighting technique for n_f=4 and 2+1 staggered QCD. We use semi-realistic masses on L_t=4 lattices. The critical endpoint (E) of 2+1 flavour QCD on the \mu-T plane is located. Our results are based on {\cal{O}}(10^3-10^4) configurations.