Abstract:
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 (t[overline t]-->W+bW-[overline b]-->lnubq[overline q][prime][overline b]). The top-quark mass is extracted using a direct calculation of the probability density that each event corresponds to the t[overline t] 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 events observed in 955 pb-1 of integrated luminosity, we achieve the single most precise measurement of the top-quark mass, 170.8$\pm$2.2(stat.)$\pm$1.4(syst.) GeV/c2.
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