Top Quark Mass Measurements on Behalf of the Cdf and Dø Collaborations

Preliminary results on the measurement of the top quark mass at the Tevatron Col-lider are presented. In the dilepton decay channel, the CDF Collaboration measures mt=175.0 +17.4 −16.9 (stat.)±8.4(syst.) GeV/c 2 , using a sample of ∼126 pb −1 of proton-antiproton collision data at √ s = 1.96 TeV (Run II). In the lepton plus jets channel, the CDF Collaboration measures 177.5 +12.7 −9.4 (stat.)±7.1(syst.) GeV/c 2 , using a sample of ∼102 pb −1 at √ s = 1.96 TeV. The DØ Collaboration has newly applied a likelihood technique to improve the analysis of ∼125 pb −1 of proton-antiproton collisions at √ s = 1.8 TeV (Run I), with the result: mt=180.1±3.6(stat.)±3.9(syst.) GeV/c 2. The latter is combined with all the measurements based on the data collected in Run I to yield the most recent and comprehensive experimental determination of the top quark mass: mt = 178.0±2.7(stat.)±3.3(syst.) GeV/c 2 .