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

By A. Bazavov, H. Ding, P. Hegde, O. Kaczmarek, F. Karsch, Nikhil Karthik, E. Laermann, Anirban Lahiri, R. Larsen, Shuang Li and 7 more. Physics Letters B, 2018

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Abstract 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 μ X = 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 T c ( μ X ) = T c ( 0 ) [ 1 − κ 2 X ( μ X / T c ( 0 ) ) 2 − κ 4 X ( μ X / T c ( 0 ) ) 4 ] , we determined κ 2 X and κ 4 X from Taylor expansions of chiral observables in μ X . We obtained a precise result for T c ( 0 ) = ( 156.5 ± 1.5 ) MeV. For analogous thermal conditions at the chemical freeze-out of relativistic heavy-ion collisions, i.e., μ S ( T , μ B ) and μ Q ( T , μ B ) fixed from strangeness-neutrality and isospin-imbalance, we found κ 2 B = 0.012 ( 4 ) and κ 4 B = 0.000 ( 4 ) . For μ B ≲ 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/fm 3 and constant entropy density of 3.7 ( 5 ) fm − 3 .

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/88461b2477516d9bde2f90780d21b3f5df4856f6

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In Nuclear and High Energy Physics

  1. A. Eichhorn
  2. W. Metzner
  3. M. Tissier
  4. N. Dupuis
  5. N. Wschebor
  6. L. Canet
  7. Jan M. Pawlowski
  8. Markus Q. Huber

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