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 W^± and Z⁰ 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^-1 luminosity at the Tevatron should be able to provide useful constraints on the nonperturbative functions.
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Ladinsky et al. (1994) studied this question.