Search for Heavy Top t'->Wq In Lepton Plus Jets Events
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We search for the heavy top (t') quark pair production decaying to Wq final states in 347 pb-1 of the CDF Run 2 data sample of lepton+jets. We reconstruct the mass of the t' quark and perform a 2D-fit of the observed (HT,Mreco) distribution to discriminate the new physics signal from Standard Model backgrounds. No evidence for t' signal is observed.
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| Upper limit, at 95% CL, on the production rate for t' as a function of t' mass (red). The purple curve is a theoretical cross section. The blue band represents +/-1 standard deviation expectation limit. | The magnified version of the figure. |
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Distributions of HT (left) and Mreco (right) showing result of fit for m(t')=225 GeV. The normalizations of the various sources and distortions of kinematic distributions due to systematic effects are those corresponding to the maximum likelihood when the cross section for t' is set to its 95% CL upper limit. |
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2D-distribution of HT and Mreco for m(t')=225 GeV. Simulated physics processes are normalized relative to each other to correspond to the maximum likelihood when the cross section for t' is set to its 95% CL upper limit. The ticks at the axes represent the binning used in the fit. |