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

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 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 TcX) = Tc(0) [1 – κX2 (µX/Tc(0))2 – κ4X (µX/Tc(0))4], we determined κX2 and κX4 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.

Authors:
; ORCiD logo; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1545894
Alternate Identifier(s):
OSTI ID: 1557713
Report Number(s):
BNL-211871-2019-JAAM
Journal ID: ISSN 0370-2693; S0370269319303223; PII: S0370269319303223
Grant/Contract Number:  
SC0012704
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Name: Physics Letters B Journal Volume: 795 Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Bazavov, A., Ding, H. -T., Hegde, P., Kaczmarek, O., Karsch, F., Karthik, N., Laermann, E., Lahiri, Anirban, Larsen, R., Li, S. -T., Mukherjee, Swagato, Ohno, H., Petreczky, P., Sandmeyer, H., Schmidt, C., Sharma, S., and Steinbrecher, P. Chiral crossover in QCD at zero and non-zero chemical potentials. Netherlands: N. p., 2019. Web. doi:10.1016/j.physletb.2019.05.013.
Bazavov, A., Ding, H. -T., Hegde, P., Kaczmarek, O., Karsch, F., Karthik, N., Laermann, E., Lahiri, Anirban, Larsen, R., Li, S. -T., Mukherjee, Swagato, Ohno, H., Petreczky, P., Sandmeyer, H., Schmidt, C., Sharma, S., & Steinbrecher, P. Chiral crossover in QCD at zero and non-zero chemical potentials. Netherlands. https://doi.org/10.1016/j.physletb.2019.05.013
Bazavov, A., Ding, H. -T., Hegde, P., Kaczmarek, O., Karsch, F., Karthik, N., Laermann, E., Lahiri, Anirban, Larsen, R., Li, S. -T., Mukherjee, Swagato, Ohno, H., Petreczky, P., Sandmeyer, H., Schmidt, C., Sharma, S., and Steinbrecher, P. Thu . "Chiral crossover in QCD at zero and non-zero chemical potentials". Netherlands. https://doi.org/10.1016/j.physletb.2019.05.013.
@article{osti_1545894,
title = {Chiral crossover in QCD at zero and non-zero chemical potentials},
author = {Bazavov, A. and Ding, H. -T. and Hegde, P. and Kaczmarek, O. and Karsch, F. and Karthik, N. and Laermann, E. and Lahiri, Anirban and Larsen, R. and Li, S. -T. and Mukherjee, Swagato and Ohno, H. and Petreczky, P. and Sandmeyer, H. and Schmidt, C. and Sharma, S. and Steinbrecher, P.},
abstractNote = {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 – κX2 (µX/Tc(0))2 – κ4X (µX/Tc(0))4], we determined κX2 and κX4 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.},
doi = {10.1016/j.physletb.2019.05.013},
journal = {Physics Letters B},
number = C,
volume = 795,
place = {Netherlands},
year = {Thu Aug 01 00:00:00 EDT 2019},
month = {Thu Aug 01 00:00:00 EDT 2019}
}

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https://doi.org/10.1016/j.physletb.2019.05.013

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