Aspects of chiral symmetry in QCD at T = 128 MeV

We investigate several aspects of chiral symmetry in QCD at a temperature of \(T = 128\,\text{MeV}\). The study is based on a \(24\times 96^3\) lattice-QCD ensemble with O(\(a\))-improved Wilson quarks and physical up, down and strange quark masses. The pion quasiparticle turns out to be significant...

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Bibliographic Details
Published in:arXiv.org 2022-11
Main Authors: Cè, Marco, Harris, Tim, Krasniqi, Ardit, Meyer, Harvey B, Török, Csaba
Format: Article
Language:English
Subjects:
Chiral dynamics
Correlators
Elementary excitations
Order parameters
Perturbation theory
Pions
Quantum chromodynamics
Quarks
Symmetry
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Summary:We investigate several aspects of chiral symmetry in QCD at a temperature of \(T = 128\,\text{MeV}\). The study is based on a \(24\times 96^3\) lattice-QCD ensemble with O(\(a\))-improved Wilson quarks and physical up, down and strange quark masses. The pion quasiparticle turns out to be significantly lighter than the zero-temperature pion mass, even though the corresponding static correlation length is shorter. We perform a quantitative comparison of our findings to predictions of chiral perturbation theory. Among several order parameters for chiral symmetry restoration, we compute the difference of the vector- and axial-vector time-dependent correlators and find it to be reduced by a factor \(\sim2/3\) as compared to its vacuum counterpart.
ISSN:2331-8422
DOI:10.48550/arxiv.2211.15558