We present a direct measurement of the mass difference
between t and t-bar quarks using tt-bar candidate events in the lepton +
jets channel, collected with the CDF II detector at Fermilab's 1.96 TeV
Tevatron p anti-p Collider. We make an event by event estimate of the
mass difference to construct templates for top quark pair signal events
and background events. The resulting mass difference distribution of
data is compared to templates of signals and background using a maximum
likelihood fit. From a sample corresponding to an integrated luminosity
of 5.6 fb-1, we measure a mass difference, Delta M_top ÿ_t - M_t-bar
ÿ 3.3 +/- 1.4 (stat) +/- 1.0 (syst) GeV/c2, approximately two standard
deviations away from the CPT hypothesis of zero mass difference.
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Updated: Monday, 2011 April 18 16:05:24 CDT automatically from input from "Carol Picciolo"