  We compute differential distributions for Drell-Yan processes at the LHC and
the Tevatron colliders at next-to-next-to-leading order in perturbative QCD,
including fiducial cuts on the decay leptons in the final state. The comparison
of predictions obtained with four different codes shows excellent agreement,
once linear power corrections from the fiducial cuts are included in those
codes that rely on phase-space slicing subtraction schemes. For $Z$-boson
production we perform a detailed study of the symmetric cuts on the transverse
momenta of the decay leptons. Predictions at fixed order in perturbative QCD
for those symmetric cuts, typically imposed in experiments, suffer from an
instability. We show how this can be remedied by an all-order resummation of
the fiducial transverse momentum spectrum, and we comment on the choice of cuts
for future experimental analyses.
