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

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arxiv 1711.09239 v1 pith:52TBEYIF submitted 2017-11-25 hep-lat

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

classification hep-lat
keywords susceptibilitysymmetrytemperatureaxiallatticeoverlapabovebreaking
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We investigate the axial $U(1)_A$ symmetry breaking above the critical temperature in two-flavor lattice QCD. The ensembles are generated with dynamical M\"obius 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.

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