As summarized in Chapter 5, DØ observes
a highly significant excess of events over background,
with a significance of 
(
).
As demonstrated in Chapter 8, this excess is consistent
with standard model top production with 
200 GeV/
.
For the final mass result,
the loose cuts and the 
resolution
functions are used. The measured top mass is then
.
(The result reported in [1] was
; the difference is the new systematic
error estimate of Section 8.4.)
If the 
resolution functions are used instead
of the ones, the result is
.
For the event samples used for the mass determination, the significance
of the result with the standard cuts is 
if the
mass information is used and 
if it is not.
The corresponding numbers for the loose cuts are
and 
, respectively.
There are numerous ways in which this measurement can be improved in the future. Most obviously, the remainder of run 1B will bring in significantly more statistics. This will help not only directly, in increasing the size of the candidate sample, but also indirectly, by decreasing the statistical error in the control samples used for jet calibration and background determination.
Changes to the fitting procedure will also improve this result. Different jet algorithms are being investigated; some (such as the nearest neighbor clustering algorithm) show some promise for improving the ultimate resolution. The methodology used for handling the jet corrections could be improved, as could the way in which extra jets are handled. Finally, increased Monte Carlo statistics will improve the accuracy of the final likelihood fit.