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

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

2005-10-02

arxiv.org/abs/hep-ex/0510002v1

Physics

High Energy Physics

High Energy Physics - Experiment

4 pages, 2 figures, to appear in the proceedings of the International Europhysics Conference on High Energy Physics, Lisboa,

Scientific paper

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.

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