  The Parton-Branching Method (PB) facilitates the determination of Transverse
Momentum Dependent (TMD) parton densities across a wide \kt\ range, spanning
small to large transverse momentum scales. In the small $k_T$ region, both
intrinsic parton motion and resummed ultra-soft gluons are significant
contributors. Our analysis highlights their crucial role in shaping integrated
and TMD parton densities.
  Using PB-derived TMD parton densities and a NLO calculation in MC@NLO style,
we compute the transverse momentum spectrum of Drell-Yan pairs across a broad
mass range. The spectrum's sensitivity to the intrinsic $k_T$ distribution
allows us to fine-tune parametric parameters. Starting from the
PB-NLO-HERAI+II-2018 set2 TMD parton distributions, we determine the intrinsic
$k_T$ distribution width, resulting in a slightly wider profile than the
default set. Importantly, this width remains independent of Drell-Yan pair mass
and center-of-mass energy ($\sqrt{s}$), distinguishing our approach.
