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

Research output: Contribution to journalJournal article


<mark>Journal publication date</mark>18/10/2010
<mark>Journal</mark>Physics Letters B
Issue number15
Number of pages7
Pages (from-to)515-521
<mark>Original language</mark>English


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 function of the transverse momentum ($p_T$) of the top quark. The selected events contain a high-$p_T$ lepton ($\ell$), four or more jets, and a large imbalance in $p_T$, and correspond to 1 fb${}^{-1}$ of integrated luminosity recorded with 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 to the $t\bar{t}\to WbW\bar{b} \to \ell\nu b q\bar{q}'\bar{b}$ process. Results from 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.

Bibliographic note

8 pages, 6 figures, 4 tables, updated to reflect the published version