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Aspects of chiral symmetry in QCD at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>T</mml:mi><mml:mo>=</mml:mo><mml:mn>128</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>MeV</mml:mi></mml:math>
We investigate several aspects of chiral symmetry in QCD at a temperature of $T=128\text{ }\text{ }\mathrm{MeV}$. The study is based on a $24\ifmmode\times\else\texttimes\fi{}9{6}^{3}$ lattice-QCD ensemble with $\mathrm{O}(a)$-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 …