主讲人：梁剑，华南师范大学研究员
时 间：2026年11月11日10:00
地 点：物电学院A栋316
联系人：姚德良
讲座摘要：Strong CP violation is of great interest both theoretically and experimentally. We report lattice QCD calculations of the nucleon electric dipole moment (EDM), the CP-violating pion-nucleon coupling, and the pion mass shift induced by the QCD $\theta$ term. Our calculations employ chiral fermions, which enable a fermionic definition of the topological charge with mild discretization effects. Furthermore, chiral fermions preserve exact chiral symmetry at finite lattice spacing, ensuring a well-defined chiral limit and allowing a reliable extrapolation of our results from heavy pion masses to the physical point. Utilizing the cluster decomposition error reduction (CDER) technique, we obtain statistically significant non-zero results for the nucleon EDM. Notably, the CP-violating pion-nucleon coupling and the $\theta$-induced pion mass shift are computed directly on the lattice for the first time.
主讲人简介：梁剑，华南师范大学量子物质研究院研究员，博士生导师。2010年本科毕业于南开大学，2015年于中国科学院高能物理研究所获得博士学位，后在美国肯塔基大学从事博士后研究，2020年入职华南师范大学。主要从事格点量子色动力学相关的研究工作，致力于从第一性原理出发通过大规模数值模拟研究强相互作用低能性质与强子结构。
