主讲人：靳路昶，康涅狄格大学助理教授
时 间：2020年12月10日10:00
地 点：物电学院A栋316；腾讯会议ID：384 303 829
联系人：戴凌云
讲座摘要：We present a first, realistic lattice QCD calculation of the $\gamma W$-box diagrams. The low-momentum integral for the $\gamma W$ loop is calculated using lattice QCD simulation and the high-momentum part is computed using perturbation theory. Using the pion semileptonic decay as an example, we demonstrate the feasibility of the methodology. By using domain wall fermion at the physical pion mass with multiple lattice spacings and volumes, we obtain the axial $\gamma W$-box contributions to the pion decay, $\square_{\gamma W}^{VA}\big|_{\pi}=2.826(4)_\text{stat}{22}_\text{sys}\times10^{-3}$, where the total uncertainty are controlled to a level of $\lesssim1$\%. This exploratory study sheds the light on the first-principles computation of the $\gamma W$-box contributions to the nucleon decay, which play a decisive role in the determination of $|V_{ud}|$.
主讲人简介：靳路昶，康涅狄格大学助理教授，2011年毕业于北京大学物理系，2016年哥伦比亚大学博士。2016-2017年美国布鲁克海文国家实验室助理研究员。主要研究格点QCD计算，发表论文近30篇，包括7篇Physical Review Letters，总引用600多次. 2020年获得美国能源部DOE Early Career Award. 2019年获 Kenneth G. Wilson Award for Excellence in Lattice Field Theory.
