Axial $U(1)$ symmetry at high temperature in 2-flavor lattice QCD

Understand

We investigate the axial $U(1)_A$ symmetry breaking above the critical temperature in two-flavor lattice QCD.

• The ensembles are generated with dynamical M\"obius domain-wall or reweighted overlap fermions.
• The $U(1)_A$ susceptibility is extracted from the low-modes spectrum of the overlap Dirac eigenvalues.
• We show the quark mass and temperature dependences of $U(1)_A$ susceptibility.