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We present a measurement of the differential cross section for $t\bar{t}$events produced in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV as a functionof the transverse momentum ($p_T$) of the top quark. The selected eventscontain a high-$p_T$ lepton ($\ell$), four or more jets, and a large imbalancein $p_T$, and correspond to 1 fb${}^{-1}$ of integrated luminosity recordedwith the D0 detector. Each event must have at least one candidate for a $b$jet. Objects in the event are associated through a constrained kinematic fit tothe $t\bar{t}\to WbW\bar{b} \to \ell\nu b q\bar{q}'\bar{b}$ process. Resultsfrom next-to-leading-order perturbative QCD calculations agree with themeasured differential cross section. Comparisons are also provided topredictions from Monte Carlo event generators using QCD calculations atdifferent levels of precision.

Dependence of the $t\bar{t}$ production cross section on the transverse momentum of the top quark