We present a measurement of the mass of the top quark using
data corresponding to an integrated luminosity of 1.9 fb-1 of p anti-p
collisions collected at s**(1/2) ñ.96 TeV with the CDF II detector at
Fermilab's Tevatron. This is the first measurement of the top quark mass
using top-antitop pair candidate events in the lepton + jets and dilepton
decay channels simultaneously. We reconstruct two observables in each
channel and use a non-parametric kernel density estimation technique
to derive two-dimensional probability density functions from simulated
signal and background samples. The observables are the top quark mass
and the invariant mass of two jets from the W decay in the lepton +
jets channel, and the top quark mass and the scalar sum of transverse
energy of the event in the dilepton channel. We perform a simultaneous
fit for the top quark mass and the jet energy scale, which is constrained
in situ by the hadronic W boson mass. Using 332 lepton + jets candidate
events and 144 dilepton candidate events, we measure the top quark mass
to be M_top ñ71.9 +/- 1.7(stat. + JES) +/- 1.1 (other syst.) GeV/c2 .
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Updated: Wednesday, 2009 July 08 10:28:48 CDT automatically from input from carol picciolo