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Topological charge and U(1)A symmetry in the high temperature phase of QCD
1996
Physics Letters B
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We discuss the global symmetries of the high temperature phase of QCD with N_f massless quarks. We show that the U(N_f) × U(N_f) symmetries are only violated by operators of dimension ≥ 3 N_f. For N_f > 2 this implies that the thermal two-point correlation functions of the η' and π^a's are identical. We discuss the implications of this for the chiral phase transition at finite temperature.
doi:10.1016/0370-2693(96)00280-8
fatcat:qnpbvzp7und3hko7r52vj4s7ly