We study the dependence of the static quark free energy on the baryon chemical potential for Nf=2+1 QCD with physical quark masses, in a range of temperature spanning from 120 MeV up to 1 GeV and adopting a stout staggered discretization with two different values of the Euclidean temporal extension, Nt=6 and Nt=8. In order to deal with the sign problem, we exploit both Taylor expansion and analytic continuation, obtaining consistent results. We show that the dependence of the free energy on μB is sensitive to the location of the chiral crossover, in particular the μB susceptibility, i.e., the linear term in μB2 in the Taylor expansion of the free energy, has a peak around 150 MeV. We also discuss the behavior expected in the high temperature regime based on perturbation theory, and obtain a good quantitative agreement with numerical results.
Dependence of the static quark free energy on μb and the crossover temperature of Nf=2+1 QCD
D'Elia M.;Rucci A.;
2019-01-01
Abstract
We study the dependence of the static quark free energy on the baryon chemical potential for Nf=2+1 QCD with physical quark masses, in a range of temperature spanning from 120 MeV up to 1 GeV and adopting a stout staggered discretization with two different values of the Euclidean temporal extension, Nt=6 and Nt=8. In order to deal with the sign problem, we exploit both Taylor expansion and analytic continuation, obtaining consistent results. We show that the dependence of the free energy on μB is sensitive to the location of the chiral crossover, in particular the μB susceptibility, i.e., the linear term in μB2 in the Taylor expansion of the free energy, has a peak around 150 MeV. We also discuss the behavior expected in the high temperature regime based on perturbation theory, and obtain a good quantitative agreement with numerical results.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.