Speaker
Description
The $U(1)_A$ symmetry of the massless QCD Lagrangian is broken in the quantised theory but may be effectively restored at some finite temperature with important consequences on the order of the chiral transition and the QCD phase diagram in the chiral limit. It has been argued in the literature that one way to probe the effective restoration of $U(1)_A$ is to check for the degeneracy of flavour non-singlet pseudoscalar and scalar correlators. In this work, we consider a new method of examining this degeneracy based upon hadron correlation functions on the anisotropic FASTSUM ensembles. The anisotropic nature and our newest Generation 3 ensemble aid in a precise determination of the effective restoration of the $U(1)_A$ symmetry which we find to be $T_{\text{chiral}} <T_{U(1)_A}\lesssim 2\,T_{\text{chiral}}$ at finite quark mass.
| Parallel Session (for talks only) | QCD at nonzero temperature and density |
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