Search for Heavy Top t'>Wb In Lepton Plus Jets Events

Contents:
Introduction
We search for the heavy top (t') quark pair production decaying to Wb
final states in 5.6 fb^{1} of the CDF Run 2 data sample of
lepton+jets (requiring at least on tagged b jet). We reconstruct the
mass of the
t' quark and perform a 2Dfit of the observed (H_{T},M_{reco})
distribution
to
discriminate
the
new
physics signal from standard model
backgrounds. H_{T} is defined here as the
sum of the Jet E_{T}s, lepton E_{T} and Missing E_{T}. M_{reco} is the
reconstructed mass of the t'.
We assume that the t' quark
The search has
theoretical motivation from several different sources.
Distributions of H_{T} (left) and M_{reco} (right) showing result of the no signal fit. 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.  
(pdf) 
(pdf) 
Distributions
of
the
mass
of the t't'bar system for each of the lepton types as well as
ratio plots of data / bacgkround. All
backgrounds scaled to fit results 

(eps)
logPlot
(gif) logPlot (eps) (eps)  Ratio 
(eps) (eps)  Ratio 
(eps) (eps)  Ratio 
(eps) (eps)  Ratio 