Axial U(1) symmetry at high temperature in 2-flavor lattice QCD
KEK Theory Center, High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan
2 Center for Gravitational Physics, Yukawa Institute for Theoretical Physics, Kyoto 606-8502, Japan
3 RIKEN BNL Research Center, Brookhaven National Laboratory, Upton NY 11973, USA
4 School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
5 Department of Physics, Osaka University, Toyonaka 560-0043, Japan
6 School of High Energy Accelerator Science, The Graduate University for Advanced Studies (Sokendai), Tsukuba 305-0801, Japan
* Speaker, e-mail: email@example.com
Published online: 26 March 2018
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 = 220MeV imply that the U(1)A symmetry is restored in the chiral limit. Its coincidence with vanishing topological susceptibility is observed.
© The Authors, published by EDP Sciences, 2018
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