【视频】【强子物理】第十五届HAPOF论坛 | 华中师大丁亨通教授

The phenomenon of anomaly plays an important role in quantum field theory. In QCD how axial anomaly manifests itself in the two-point correlation functions of iso-triplet scalar and pseudo-scalar mesons affects the nature of chiral phase transition. In this talk I first review current studies of the fate of UA(1) anomaly in the finite temperature lattice QCD. and then propose novel relations between the quark mass derivatives of Dirac eigenvalue spectrum ρ and correlation functions among eigenvalues in order to study the microscopic origin of the axial anomaly. We finally show our results in the chiral and continuum limit in (2+1)-flavor lattice QCD at 1.6Tc. Out results suggest that the axial anomaly is driven by the weakly interacting (quasi-)instanton gas motived ρ above 1.6Tc and the chiral phase transition is of 2nd order and belongs to 3-d O(4) universality class. The talk is based on https://arxiv.org/abs/2010.14836.