Axial U(1) symmetry and Dirac spectra in high-temperature phase of $N_f=2$ lattice QCD

Abstract

The axial $U(1)$ symmetry in the high-temperature phase is investigated with $N_f=2$ lattice QCD simulations. The gauge ensembles are generated with Möbius domain-wall fermions, and the overlap/domain-wall reweighting is applied. We find that the $U(1{)}_A$ susceptibility evaluated from the spectrum of overlap-Dirac eigenvalues is strongly suppressed in the chiral limit. We also study its volume dependence.

Comments: 7 pages, 2 figures, talk presented at the 36th International Symposium on Lattice Field Theory (Lattice 2018), 22-28 July, 2018, Michigan, USA