Abstract
We consider the production of γ *, W and Z vector bosons in hadron-hadron collisions in perturbative QCD. We present results from a new numerical program which gives a full description of the production of the vector bosons and of their decay products. At small q T the calculation includes resummation of large logarithms and non-perturbative effects. The resummation is matched with the full O( α s ) calculation. In addition, the program correctly reproduces the known O( α s ) cross section when integrated over q T. Besides presenting results for W and Z production at the Tevatron, we also review constraints on the non-perturbative functions using fixed-target data on lepton pair production, and make several observations on this topic.
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