We present a measurement of the top quark mass with tt-bar
dilepton events produced in p anti-p collisions at the Fermilab Tevatron
(sqrt s ñ.96 TeV) and collected by the CDF II detector. A sample
of 328 events with a charged electron or muon and an isolated track,
corresponding to an integrated luminosity of 2.9 fb-1, are selected as
tt-bar candidates. To account for the unconstructed event kinematics, we
scan over the phase space for the azimuthal angles (phi_nu_1, phi_nu_2)
of neutrinos and reconstruct the top quark mass by minimizing a chi2
function in the tt-bar dilepton hypothesis. We assign chi2-dependent
weights to the solutions in order to build a preferred mass for
each event. Preferred mass distributions (templates) are built from
simulated tt-bar and background events, and parameterized in order to
provide continuous probability density functions. A likelihood fit
of the preferred mass distribution in data to a weighted sum of signal
and background probability density functions gives a top quark mass of
165.5+3.4_-3.3(stat.) +/- 3.1(syst.) GeV/c2.
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Updated: Friday, 2009 June 05 16:23:12 CDT automatically from input from carol picciolo