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The Parton-Branching Method (PB) facilitates the determination of TransverseMomentum Dependent (TMD) parton densities across a wide \kt\ range, spanningsmall to large transverse momentum scales. In the small $k_T$ region, bothintrinsic parton motion and resummed ultra-soft gluons are significantcontributors. Our analysis highlights their crucial role in shaping integratedand 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 broadmass range. The spectrum's sensitivity to the intrinsic $k_T$ distributionallows us to fine-tune parametric parameters. Starting from thePB-NLO-HERAI+II-2018 set2 TMD parton distributions, we determine the intrinsic$k_T$ distribution width, resulting in a slightly wider profile than thedefault set. Importantly, this width remains independent of Drell-Yan pair massand center-of-mass energy ($\sqrt{s}$), distinguishing our approach.

NLO Analysis of Small-$k_T$ Region in Drell-Yan Production with Parton Branching