We present a measurement of the mass of the top quark using data from 
proton-antiproton collisions recorded at the CDF experiment in Run II
of the Fermilab Tevatron.  Events are selected from the single lepton plus 
jets final state ($t\bar t \to W^+b W^-\bar{b} \to \ell\nu b q \bar{q}' \bar{b}$).  
The top quark mass is extracted using a calculation of the probability
density for a $t\bar t$ final state to resemble a data event.  This
probability density is a function of both top quark mass and energy scale 
of calorimeter jets, constrained \it{in situ} with the hadronic $W$ boson
mass.  Using 167 events observed in 955 pb$^{-1}$ integrated
luminosity, we achieve the single most precise measurement of top quark mass
to date of 170.8 $\pm$ 2.2 (stat.) $\pm$ 1.4 (syst.) GeV/c$^2$, where
the quoted statistical uncertainty includes uncertainty from the determination
of the jet energy scale.



Posted to /cdf/pub/thesis/cdf8793_mohr_thesis.ps
    http://www-cdf.fnal.gov/thesis/cdf8793_mohr_thesis.ps

Posted by mohr