The High Temperature Phase of QCD and {\boldmath $U(1)_A$} Symmetry

Physics – High Energy Physics – High Energy Physics - Phenomenology

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Scientific paper

10.1103/PhysRevD.54.R1867

Inequalities for QCD functional integrals are used to establish that up to
certain technical assumptions. the high temperature chirally restored phase of
QCD is effectively symmetric under $U(N_f) \times U(N_f)$ rather than $SU(N_f)
\times SU(N_f)$. If these assumptions are correct, there are no effects due to
anomalous breaking of $U(1)_A$ on correlation functions in this phase.

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