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Transverse momentum dependent (TMD) distributions match collinear partondensity functions (PDF) in the limit of small transverse distances, which isaccounted for by global extractions of TMD distributions. We study theinfluence of the collinear PDF value and uncertainties on the determination ofunpolarized TMD distributions and the description of Drell-Yan (DY) and Z-bosonproduction measurements at low transverse momenta. We take into account, forthe first time, flavor-dependent non-perturbative TMD profiles. We carry out aBayesian analysis to incorporate the propagation of PDF uncertainties into TMDextractions. We find that collinear PDF uncertainties and non-perturbative TMDflavor dependence are both essential to obtain reliable TMD determinations, andshould be included in future global analyses.

PDF bias and flavor dependence in TMD distributions