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Volume 363 - 37th International Symposium on Lattice Field Theory (LATTICE2019) - Main session
Axial U(1) symmetry and mesonic correlators at high temperature in $N_f=2$ lattice QCD
K. Suzuki,* S. Aoki, Y. Aoki, G. Cossu, H. Fukaya, S. Hashimoto, C. Rohrhofer on behalf of JLQCD Collaboration
*corresponding author
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Pre-published on: 2020 January 19
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Abstract
We investigate the high-temperature phase of QCD using lattice QCD simulations with $N_f = 2$ dynamical M\"obius 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 violation of the chiral symmetry. For those observables, we reweight the M\"obius 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 $\geq$ 220 MeV.
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