Axial U(1) symmetry and mesonic correlators at high temperature in $N_f=2$ lattice QCD

Abstract

We investigate the high-temperature phase of QCD using lattice QCD simulations with $N_f=2$ dynamical Möbius domain-wall fermions. On generated configurations, we study the axial $U(1)$ symmetry, overlap-Dirac spectra, screening masses from mesonic correlators, and topological susceptibility. We find that some of the observables are quite sensitive to lattice artifacts due to a small violation of the chiral symmetry. For those observables, we reweight the Möbius domain-wall fermion determinant by that of the overlap fermion. We also check the volume dependence of observables. Our data near the chiral limit indicates a strong suppression of the axial $U(1)$ anomaly at temperatures $\ge$ 220 MeV.

arXiv comment7 pages, 4 figures, 1 table; Proceedings of the 37th International Symposium on Lattice Field Theory (Lattice 2019), 16-22 June 2019, Wuhan, China

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Cited by in corpus (2)

• Eigenvalue spectra of QCD and the fate of $U_A(1)$ breaking towards the chiral limit
• New developments in lattice QCD on equilibrium physics and phase diagram