西南理论物理中心系列报告：Analytic third-order QCD corrections to top quark decay

报告摘要：We present the first analytic results of N3LO QCD corrections to the top-quark decay width. We focus on the dominant leading color contribution, which includes light-quark loops. By utilizing the optical theorem, the N3LO corrections are related to the imaginary parts of the four-loop self-energy Feynman diagrams,which are calculated with differential equations. The third-order QCD corrections decrease the LO decay width by 0.667%, and the scale uncertainty is reduced by half compared to the NNLO result. The most precise prediction for the top-quark width is now 1.321 GeV for mt=172.69 GeV.

报告人介绍：王烨凡，2016年本科毕业于山东大学物理学院，2021年博士毕业于中国科学院高能物理研究所；2021年7月-2024年3月为山东大学博士后，2023年3月入职南京师范大学。主要研究方向为微扰量子场论以及顶夸克物理、Higgs物理的高精度理论预言。