报告题目：Off-lightcone Wilson-line operators in gradient flow
报告人：王翔鹏 博士 （德国慕尼黑工业大学）
报告时间：2024年2月26日 上午10:00
报告地点：理8栋118学术报告厅
报告内容：
Off-lightcone Wilson-line operators are constructed using local operators connected by time-like or space-like Wilson lines, which ensure gauge invariance. Off-lightcone Wilson-line operators have broad applications in various contexts. For instance, space-like Wilson-line operators play a crucial role in determining quasi-distribution functions (quasi-PDFs), while time-like Wilson-line operators are essential for understanding quarkonium decay and production within the potential non-relativistic QCD (pNRQCD) framework. In this work, we establish a systematic approach for calculating the matching from the gradient-flow scheme to the MS scheme in the limit of small flow time for off-lightcone Wilson-line operators. By employing the one-dimensional auxiliary-field formalism, we simplify the matching procedure, reducing it to the matching of local current operators. We provide one-loop level matching coefficients for these local current operators. For the case of hadronic matrix element related to the quark quasi-PDFs, we show at one-loop level that the finite flow time effect is very small as long as the flow radius is smaller than the physical distance z, which is usually satisfied in lattice gradient flow computations. Applications include lattice gradient flow computations of quark/gluon quasi-PDFs, gluonic correlators related to quarkonium decay and production in pNRQCD, and spin-dependent potentials in terms of chromoelectric and chromomagnetic field insertions into a Wilson loop.
报告人简介：
2011年本科毕业于吉林大学，2014年硕士毕业于中科院大学，2018年博士毕业于德国汉堡大学和德国同步辐射加速器中心 (DESY)。在美国阿贡国家实验室做完第一期博后之后，目前在德国慕尼黑工业大学做第二期博后。研究方向主要为重夸克偶素物理，微扰QCD高阶计算，微扰Gradient flow, 有效场论及QCD因子化。