Measurement of the ttbar production cross section in proton-antiproton collisions at sqrt{s}=1.96 TeV using multijet events

TL;DR

This paper reports measurements of the top-antitop quark pair production cross section in proton-antiproton collisions at 1.96 TeV, using various decay channels and jet selection criteria, with results consistent with the Standard Model.

Contribution

It provides the first comprehensive measurement of the ttbar production cross section across multiple decay channels at Tevatron energies.

Findings

Measured cross section: 7.1 pb with uncertainties

Consistent with Standard Model predictions

Used multiple decay channels for robust results

Abstract

We present two measurements of the ttbar production cross section in collisions of protons and antiprotons at sqrt{s}=1.96 TeV. We analyze a dataset of 310+/-20 pb-1 collected with the CDF2 detector. In the first measurement, we select events with six to eight jets, at least one of which having a displaced secondary vertex, little or no missing transverse energy and optimized kinematical criteria consistent with the ttbar all-hadronic decay channel. In the second measurement, we select events with four or more jets, at least one of which having a displaced secondary vertex, high missing transverse energy, and optimized kinematical criteria consistent with the decay of ttbar to tau+jets. The averaged ttbar production cross section, determined from six different measurements using the CDF2 detector in the dilepton, lepton+jets and all-hadronic decay channels, is also calculated to be sigma_ttbar=7.1+/-0.6 (stat)+/-0.7(syst)+/-0.4 (lumi) pb, in agreement with the prediction of the standard model.