Chiral crossover in QCD at zero and non-zero chemical potentials - INSPIRE

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Chiral crossover in QCD at zero and non-zero chemical potentials

HotQCD

Collaboration

•

A. Bazavov
(
- Michigan State U., East Lansing (main)
)

Dec 19, 2018

7 pages

Published in:

Phys.Lett.B 795 (2019) 15-21

Published: Aug 10, 2019

e-Print:

1812.08235 [hep-lat]

DOI:

10.1016/j.physletb.2019.05.013 (publication)

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Abstract: (Elsevier)

We present results for pseudo-critical temperatures of QCD chiral crossovers at zero and non-zero values of baryon ( B ), strangeness ( S ), electric charge ( Q ), and isospin ( I ) chemical potentials μX=B,Q,S,I . The results were obtained using lattice QCD calculations carried out with two degenerate up and down dynamical quarks and a dynamical strange quark, with quark masses corresponding to physical values of pion and kaon masses in the continuum limit. By parameterizing pseudo-critical temperatures as Tc(μX)=Tc(0)[1−κ2X(μX/Tc(0))2−κ4X(μX/Tc(0))4] , we determined κ2X and κ4X from Taylor expansions of chiral observables in μX . We obtained a precise result for Tc(0)=(156.5±1.5) MeV. For analogous thermal conditions at the chemical freeze-out of relativistic heavy-ion collisions, i.e. , μS(T,μB) and μQ(T,μB) fixed from strangeness-neutrality and isospin-imbalance, we found κ2B=0.012(4) and κ4B=0.000(4) . For μB≲300 MeV, the chemical freeze-out takes place in the vicinity of the QCD phase boundary, which coincides with the lines of constant energy density of 0.42(6)GeV/fm3 and constant entropy density of 3.7(5)fm−3 .

freeze-out: chemical
finite temperature
potential: chemical
quark: mass dependence
charge: electric
entropy: density
energy: density
K: mass
heavy ion: scattering
quantum chromodynamics

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