Work

QCD deconfinement transition line up to μ B = 400 MeV from finite volume lattice simulations

Year: 2024

Type: article

Abstract: The QCD crossover line in the temperature ( T )-baryochemical potential ( μ B ) plane has been computed by several lattice groups by calculating the chiral order parameter and its susceptibility at finite values of μ B . In this work we focus on the deconfinement aspect of the transition between hadronic and quark gluon plasma phases. We define the deconfinement temperature as the peak position of the static quark entropy [ S Q ( T , μ B ) ] in T , which is based on the renormalized Polyakov loop. We extrapolate S Q ( T , μ B ) based on high statistics finite temperature ensembles on a 16 3 × 8 lattice to finite density by means of a Taylor expansion to eighth order in μ B (NNNLO) along the strangeness neutral line. For the simulations the 4HEX staggered action was used with 2 + 1 flavors at physical quark masses. In this setup the phase diagram can be drawn up to unprecedentedly high chemical potentials. Our results for the deconfinement temperature are in rough agreement with phenomenological estimates of the freeze-out curve in relativistic heavy ion collisions. In addition, we study the width of the deconfinement crossover. We show that up to μ B ≈ 400 MeV , the deconfinement transition gets broader at higher densities, disfavoring the existence of a deconfinement critical endpoint in this range. Finally, we examine the transition line without the strangeness neutrality condition and observe a hint for the narrowing of the crossover towards large μ B . Published by the American Physical Society 2024

Source: Physical review. D/Physical review. D.

DOI: 10.1103/physrevd.110.114507