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Review examines chiral and U(1) symmetry restoration in QCD, indicating significant theoretical implications.
This paper reviews the interplay between chiral and axial U(1)\(_A\) symmetry restoration in QCD at finite temperature, using effective field theories and Ward identities. We analyse how degeneration patterns of scalar and pseudoscalar partners signal symmetry restoration, relating lattice results and phenomenology. Emphasis is placed on pseudoscalar susceptibilities, their relation to quark condensates and the topological susceptibility, and their implications for \(O(4)\) versus \(O(4)× U(1)_A\) patterns. Results from Chiral Perturbation Theory are compared with lattice data, highlighting the role of explicit symmetry breaking, the approach to the chiral limit, and the impact of the strange sector. Abstract Published by the Jagiellonian University 2026 authors
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Elvira et al. (2026) studied this question.
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