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The transverse momentum cross section of $e^+e^-$ pairs in the $Z$-boson massregion of 66-116 GeV/$c^2$ is precisely measured using Run II datacorresponding to 2.1 fb$^{-1}$ of integrated luminosity recorded by theCollider Detector at Fermilab. The cross section is compared with quantumchromodynamic calculations. One is a fixed-order perturbative calculation at${\cal O}(\alpha_s^2)$, and the other combines perturbative predictions at hightransverse momentum with the gluon resummation formalism at low transversemomentum. Comparisons of the measurement with calculations show reasonableagreement. The measurement is of sufficient precision to allow refinements inthe understanding of the transverse momentum distribution.

Transverse momentum cross section of $e^+e^-$ pairs in the $Z$-boson region from $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV