LaMET2020 Online

Lattice QCD calculations of TMD soft function through large-momentum effective theory

11 Sept 2020, 10:00

30m

Zoom

Session I

Speaker

Qi-An Zhang (T.D. Lee Institute)

Description

The transverse-momentum-dependent (TMD) soft function is a key ingredient in QCD factorization of Drell-Yan and other processes with relatively small transverse momentum. We present a lattice QCD study of this function at moderately large rapidity on a 2+1 flavor CLS dynamic ensemble with $a=0.098$ fm. 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 large-momentum effective theory. We also investigate the rapidity-dependent part of the soft function---the Collins-Soper evolution kernel---based on the large-momentum evolution of the quasi-TMD wave function.

Presentation materials

Qi-An@LaMET2020.pdf