Precise measurement of the top quark mass in the lepton+jets topology at CDF II

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 ($t\bar{t}\to W^{+}b{W}^{-}\bar{b}\to l\nu bq{\bar{q}}^{\prime }\bar{b}$). The top quark mass is extracted using a direct calculation of the probability density that each event corresponds to the $t\bar{t}$ 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 {\it 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/$c^2$.

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• Measurement of the ttbar Production Cross Section in ppbar Collisions at sqrt(s) = 1.96 TeV
• Measurement of the top quark mass in the lepton+jets final state with the matrix element method
• Measurement of the Top Quark Mass with the Dynamical Likelihood Method using Lepton plus Jets Events with b-tags in ppbar Collisions at s**(1/2) = 1.96 TeV

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