  We discuss the dependence on the flavor of the intrinsic transverse momentum
in unpolarized transverse-momentum-dependent distribution functions (TMD PDFs)
and fragmentation functions (TMD FFs) analyzing data of semi-inclusive
deep-inelastic scattering (SIDIS) released by the HERMES collaboration.
Adopting a flavor-dependent Gaussian model in the transverse momentum and
neglecting QCD evolution, we find interesting evidences concerning the flavor
dependence in TMD FFs, whereas the indications are weaker in TMD PDFs and
deserve further investigations. Inclusions of new data sets of SIDIS,
electron-positron annihilations and and Drell-Yan (DY) events require a proper
treatment of QCD evolution. We try to get constraints on the non-perturbative
Sudakov factor from electron-positron annihilations into hadrons.
