Abstract
We review the phenomenology of electro-weak bosons produced in hadron-hadron collisions. In particular, we discuss the transverse momentum distribution of lepton pairs with invariant mass close to the Z peak. We describe the theoretical calculation for the magnitude of the transverse momentum Q_T and its comparison to Tevatron and LHC data. We also discuss the related variable ϕ*, describing its experimental advantages as well as its relation to the standard Q_T variable. Finally, we compare resummed predictions for ϕ* to data.
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