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

Abstract

We investigate the axial $U(1{)}_A$ symmetry breaking above the critical temperature in two-flavor lattice QCD. The ensembles are generated with dynamical Möbius 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. Our results at $T=220\mathrm{MeV}$ imply that the $U(1{)}_A$ symmetry is restored in the chiral limit. Its coincidence with vanishing topological susceptibility is observed.

8 pages, 4 figures, Proceedings of the 35th International Symposium on Lattice Field Theory, June 18-24, 2017, Granada, Spain

References in corpus (2)

• On the strength of the $U_A(1)$ anomaly at the chiral phase transition in $N_f=2$ QCD
• Topological Susceptibility in $N_f=2$ QCD at Finite Temperature

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• White Paper on New Opportunities at the Next-Generation Neutrino Experiments (Part 1: BSM Neutrino Physics and Dark Matter)
• Study of the axial U(1) anomaly at high temperature with lattice chiral fermions
• Constraining the QCD phase diagram at finite temperature and density
• Axial U(1) symmetry, topology, and Dirac spectra at high temperature in $N_f=2$ lattice QCD
• Topological Susceptibility in $N_f=2$ QCD at Finite Temperature
• Axial U(1) symmetry and mesonic correlators at high temperature in $N_f=2$ lattice QCD
• The fate of $U_A(1)$ and topological features of QCD at finite temperature