Axial U(1) symmetry at finite temperature with Möbius domain-wall fermions

Abstract

We investigate the axial $U(1)$ symmetry restoration at finite temperature in two flavor QCD. We employ the Möbius domain-wall formalism that is designed to achieve good chiral symmetry. We show the measurements of a difference of meson susceptibilities, sensitive to the $U(1{)}_A$ symmetry breaking. The signal is dominated by zero and near-zero modes. By reweighting the measure to that of overlap fermions we find a suppression of the $U(1{)}_A$ breaking effects above the chiral transition temperature.

Comments: 7 pages, 4 figures, contribution to the The 32nd International Symposium on Lattice Field Theory, 23-28 June, 2014, Columbia University New York, NY