We present a direct measurement of the mass difference between
top~($t$) and anti-top~($\bar{t}$) quarks using $\t anti-t$ candidate
events in the lepton+jets channel. We use the full data set of Tevatron
$s**(1/2) = 1.96$~TeV proton-antiproton collisions recorded by the CDF II
detector, corresponding to an integrated luminosity of \invfb{8.7}. We
make an event-by-event estimate of the mass difference to construct
templates for top-quark signal events and background events. The
resulting mass difference distribution of data compared to signal and
background templates using a likelihood fit yields $\dmt = \mathrm{M}_{t}
- \mathrm{M}_{\bar{t}} = \gevcc{\measStatSyst{-1.95}{1.11}{0.59}}$ and it
is in agreement with the standard model prediction of no mass difference.
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Updated: Friday, 2013 March 29 11:02:00 CDT automatically from input from Barbara Hehner