Nonperturbative regime in QCD resummation for gauge boson production at hadron colliders.

We study the nonperturbative functions in the Collins-Soper-Sterman resummation formalism by examining Drell-Yan data in both fixed target and collider experiments and then predict the transverse momentum distributions of the [ital W][sup [plus minus]] and [ital Z][sup 0] bosons at the Fermilab Tevatron. Our results differ from those in the literature and agree better with published CDF data. Using statistical arguments, we find a 1 fb[sup [minus]1] luminosity at the Tevatron should be able to provide useful constraints on the nonperturbative functions.