Aspects of chiral symmetry in QCD at T = 128 MeV

Abstract

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 $\sim 2/3$ as compared to its vacuum counterpart.

27 pages, 9 Figures

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• Simulation of QCD with N_f=2+1 flavors of non-perturbatively improved Wilson fermions
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Cited by in corpus (1)

• Supercooled Goldstone Bosons at the QCD Chiral Phase Transition