Lattice QCD calculations of transverse-momentum dependent soft function and Collins-Soper kernel through large-momentum effective theory

by Prof. Qi-an Zhang (Beihang University)

Wednesday 17 Nov 2021, 10:30 → 11:30 Asia/Shanghai

B105 (CHEP)

The transverse momentum-dependent (TMD) parton distributions are a natural generalization of the collinear parton distributions to include both longitudinal and transverse momentum of partons. They are playing an increasing important role in understanding the partonic structure of hadrons and high-energy scattering. Within them, the TMD soft function collect the nonperturbative effects from soft gluon radiation and subtract the rapidity divergence. And the rapidity evolution can be described by the Collins-Soper kernel. In this talk, I will give a brief review of our recent progresses on the lattice QCD calculations of TMD soft function and Collins-Soper kernel in the framework of large-momentum effective theory (LaMET). We extract the rapidity-independent (or intrinsic) part of the soft function through a large-momentum-transfer pseudo-scalar meson form factor and its quasi-TMD wave function using leading-order factorization in LaMET. The rapidity-dependent part of the soft function—the Collins-Soper evolution kernel—also can be extracted based on the large-momentum evolution of the quasi-TMD wave function. 报告人介绍： 张其安，副教授，2019年博士毕业于中国科学院高能物理研究所，2019年至2021年在上海交通大学李政道研究所做博士后，现任教于北京航空航天大学物理学院。格点合作组Lattice Parton Collaboration (LPC) 成员，主要从事强子结构的格点QCD研究。主持“博士后创新人才支持计划”，国家自然科学基金青年基金项目等。 Tecent meeting: https://meeting.tencent.com/dm/ObGztjnUxyab Meeting ID：542 836 358