In five-flavor lattice QCD with heavy up/down quarks, chiral symmetry restoration proceeds hierarchically from SU(2) to SU(5) with temperature, and the emergent chiral-spin symmetry windows are dominated by bottom-light mesons.
Topological Charge and $U(1)_A$ Symmetry in the High Temperature Phase of QCD
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abstract
We discuss the global symmetries of the high temperature phase of QCD with $N_f$ massless quarks. We show that the $U(N_f) \times U(N_f)$ symmetries are only violated by operators of dimension $\geq 3 N_f$. For $N_f > 2$ this implies that the thermal two-point correlation functions of the $\eta'$ and $\pi^a$'s are identical. We discuss the implications of this for the chiral phase transition at finite temperature.
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Symmetries in high-temperature lattice QCD with (u, d, s, c, b) optimal domain-wall quarks
In five-flavor lattice QCD with heavy up/down quarks, chiral symmetry restoration proceeds hierarchically from SU(2) to SU(5) with temperature, and the emergent chiral-spin symmetry windows are dominated by bottom-light mesons.