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It has been observed in the literature that measurements of low-massDrell-Yan (DY) transverse momentum spectra at low center-of-mass energies$\sqrt{s}$ are not well described by perturbative QCD calculations in collinearfactorization in the region where transverse momenta are comparable with the DYmass. We examine this issue from the standpoint of the Parton Branching (PB)method, combining next-to-leading-order (NLO) calculations of the hard processwith the evolution of transverse momentum dependent (TMD) parton distributions.We compare our predictions with experimental measurements at low DY mass, andfind very good agreement.In addition we use the low mass DY measurements at low$\sqrt{s}$ to determine the width $q_s$ of the intrinsic Gauss distribution ofthe PB-TMDs at low evolution scales. We find values close to what has earlierbeen used in applications of PB -TMDs to high-energy processes at the LargeHadron Collider (LHC) and HERA. We find that at low DY mass and low $\sqrt{s}$even in the region of $p_t/m_{DY} \sim 1$ the contribution of multiple softgluon emissions (included in the PB-TMDs) is essential to describethemeasurements, while at larger masses ($m_{DY} \sim m_{Z}$) and LHC energiesthe contribution from soft gluons in the region of $p_t/m_{DY}\sim 1$ is small.

The transverse momentum spectrum of low mass Drell-Yan production at next-to-leading order in the parton branching method