We present three measurements of the top-quark mass in the
lepton plus jets channel with approximately 1.9 fb-1 of integrated
luminosity collected with the CDF II detector using quantities with
minimal dependence on the jet energy scale. One measurement exploits
the transverse decay length of b-tagged jets to determine a top-quark
mass of 166.9+9.5_-8.5 (stat) +/- 2.9 (syst) GeV/c2, and another the
transverse momentum of electrons and muons from W-boson decays to
determine a top-quark mass of 173.5+8.87_-8.9 (stat) +/- 3.8 (syst)
GeV/c2. These quantities are combined in a third, simultaneous mass
measurement to determine a top-quark mass of 170.7 +/- 6.3 (stat) +/-
2.6 (syst) GeV/c2.
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Updated: Wednesday, 2009 October 07 10:30:19 CDT automatically from input from carol picciolo