| Resumen |
We present a measurement of the differential cross section for tt events produced in pp collisions at √s=1.96 TeV as a function of the transverse momentum (pT) of the top quark. The selected events contain a high-pT lepton (γ), a large imbalance in pT, four or more jets with at least one candidate for a b jet, and correspond to 1 fb-1 of integrated luminosity recorded with the D0 detector. Objects in the event are associated through a constrained kinematic fit to the tt → WbWb → γνbqq'b process. Results from next and next-to-next-to-leading-order perturbative QCD calculations agree with the measured differential cross section. Comparisons are also provided to predictions from Monte Carlo event generators using QCD calculations at different levels of precision. |
