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We present three measurements of the top quark mass in the lepton plus jetschannel with 1.9 fb-1 of data using quantities with minimal dependence on thejet energy scale in the lepton plus jets channel at CDF. One measurement usesthe mean transverse decay length of b-tagged jets (L2d) to determine the topmass, another uses the transverse momentum of the lepton (LepPt) to determinethe top mass, and a third measurement uses both variables simultaneously.  Using the L2d variable we measure a top mass of 176.7 (+10.0) (-8.9) (stat)+/- 3.4 (syst) GeV/c^2, using the LepPt variable we measure a top mass of 173.5(+8.9) (-9.1) (stat) +/- 4.2 (syst) GeV/c^2, and doing the combined measurementusing both variables we arrive at a top mass result of 175.3 +/- 6.2 (stat) +/-3.0 (syst) GeV/c^2. Since some of the systematic uncertainties arestatistically limited, these results are expected to improve significantly ifmore data is added at the Tevatron in the future, or if the measurement is doneat the LHC.

Measurement of the Top Quark Mass using Quantities with Minimal Dependence on the Jet Energy Scale