Measurement of the top-quark pair production cross-section in events with two leptons and bottom-quark jets using the full CDF data set

Abstract

We present a measurement of the top-quark pair production cross-section in proton-antiproton collisions at $\sqrt{s}$=1.96 TeV. The data were collected at the Fermilab Tevatron by the CDF II detector and correspond to an integrated luminosity of 8.8 fb${}^{-1}$, representing the complete CDF Run II data set. We select events consistent with the production of top-quark pairs by requiring the presence of two reconstructed leptons, an imbalance in the total event transverse momentum, and jets. At least one jet is required to be identified as consistent with the fragmentation of a bottom quark using a secondary-vertex-finding algorithm. The 246 candidate events are estimated to have a signal purity of 91%. We measure a cross section of $σ_{\ttbar}$ = 7.09 $\pm$ 0.84 pb, assuming a top-quark mass of 172.5 GeV/$c^2$. The results are consistent with the standard model as predicted by next-to-leading-order calculations.

Submitted to Phys. Rev. D (R)

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• Measurement of \boldmath $R=\mathcal{B}\left(t\to Wb\right)/\mathcal{B}\left(t\to Wq\right)$ in Top--Quark--Pair Decays using Dilepton Events and the Full CDF Run II Data Set
• Measurement of the top-quark mass in the $t\bar{t}$ dilepton channel using the full CDF Run II data set
• Measurement of the forward-backward asymmetry of top-quark and antiquark pairs using the full CDF Run II data set
• Measurement of the production and differential cross sections of $W^{+}{W}^{-}$ bosons in association with jets in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV
• Review of recent measurements in the top quark sector at the Tevatron
• V+jets Background and Systematic Uncertainties in Top Quark Analyses