Published: 2005
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This document presents a measurement of the top quark mass using the CDF run II detector at Fermilab. Colliding beams of protons and anti-protons at Fermilab's Tevatron ([radical]s = 1.96 TeV) produce top/anti-top pairs, which decay to W[sup +]W[sup -] b[bar b]; events are selected where one W decays hadronically, and one W decays to either e or [mu] plus a neutrino. The data sample was collected between March 2002 and September 2003, and corresponds to an integrated luminosity of approximately 162 pb[sup -1]. Thirty-seven candidate t[bar t] events are found with at least one b jet identified by its displaced vertex. In each event, the best fit top quark invariant mass is determined by minimizing a [chi][sup 2] for the overconstrained kinematic system. A likelihood fit of the reconstructed masses in the data sample to distributions from simulated signal and background events gives a top mass of 174.9[sub -7.7][sup +7.1](stat.) [+-] 6.5(syst.) GeV/c[sup 2]. The dominant systematic error is due to uncertainties in the jet energy measurements.