QCD prediction for heavy boson transverse momentum distributions

We investigate the predictive power of the Collins, Soper, and Sterman b-sp ace QCD resummation formalism for transverse momentum (Q(T)) distributions of heavy boson production in hadronic collisions. We show that the predicti ve power has a strong dependence on the collision energy rootS in addition to its well known Q(2) dependence, and the rootS dependence improves the pr edictive power at collider energies. We demonstrate that, at the Fermilab T evatron and the CERN LHC energies, the Q(T) distributions derived from b-sp ace resummation are not sensitive to the nonperturbative input at large b, and give good descriptions of the Q(T) distributions of heavy boson product ion at all transverse momenta Q(T) less than or equal to Q.