We present a measurement of the mass of the top quark from
proton-antiproton collisions recorded at the CDF experiment in Run II
of the Fermilab Tevatron. We analyze events from the single lepton
plus jets final state (tt-bar --> W+bW- b-bar --> l nu b q q-bar'
b-bar). The top quark mass is extracted using a direct calculation of
the probability density that each event corresponds to the tt-bar final
state. The probability is a function of both the mass of the top quark
and the energy scale of the calorimeter jets, which is constrained in
situ by the hadronic W boson mass. Using 167 event observed in 955 pb-1
of integrated luminosity, we achieve the single most precise measurement
of the top quark mass, 170.8 +/- 2.2(stat.) +/- 1.4 (syst.) GeV/c2.
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Updated: Tuesday, 2007 November 06 10:55:56 CST automatically from input from carol picciolo