Lattice QCD finds evidence for effective U(1)_A symmetry restoration at 319(22) MeV, well above the chiral crossover.
Lahiri,Aspects of finite temperature QCD towards the chiral limit,PoSLA TTICE2021(2022) 003 [2112.08164]
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On the effective restoration of $U(1)_A$ symmetry at finite temperature
Lattice QCD finds evidence for effective U(1)_A symmetry restoration at 319(22) MeV, well above the chiral crossover.