  We calculate the soft function using lattice QCD in the framework of large
momentum effective theory incorporating the one-loop perturbative
contributions. The soft function is a crucial ingredient in the lattice
determination of light cone objects using transverse-momentum-dependent (TMD)
factorization. It consists of a rapidity-independent part called intrinsic soft
function and a rapidity-dependent part called Collins-Soper kernel. We have
adopted appropriate normalization when constructing the pseudo-scalar meson
form factor that is needed in the determination of the intrinsic part and
applied Fierz rearrangement to suppress the higher-twist effects. In the
calculation of CS kernel we consider a CLS ensemble other than the MILC
ensemble used in a previous study. We have also compared the applicability of
determining the CS kernel using quasi TMDWFs and quasi TMDPDFs. As an example,
the determined soft function is used to obtain the physical TMD wave functions
(WFs) of pion and unpolarized iso-vector TMD parton distribution functions
(PDFs) of proton.
