\section{Conclusion}
\label{sec:conc}

We have made a new measurement of the top quark mass,
\[\gevcc{\measAStatSyst{173.5}{3.7}{3.6}{1.7}},\] 
using a novel technique that utilizes the jet energy scale information
provided by the hadronically decaying $W$\ boson in the top quark 
events.  This provides one of the most precise single constraints on this 
important physical parameter.
We have performed a cross-check of this result using a more traditional
"template" technique that does not use the {\it in situ}\ jet energy 
scale constraint, and found excellent agreement.

This measurement 
is part of a rich top physics program at CDF.
As the luminosity acquired increases from the current \invpb{318}
to an expected 4000--7000 $\invpbnoarg$ for \runii,
the statistical uncertainty will improve.
The systematic uncertainty will also be reduced till we approach 
statistical uncertainties of approximately $\gevcc{2.0}$, at which 
point the uncertainties on initial and final state radition, as well as
bottom quark jet energy scale become comparable to the statistical 
uncertainties associated with the top quark mass and jet energy scale
measurement.
More top quark mass
results from CDF are being published concurrently~\cite{r_run2dlm}.
We expect that these will provide important inputs into our understanding
of the fundamental fermions and the nature of the electroweak interaction.

\begin{acknowledgments}
We thank the Fermilab staff and the technical staffs of the
participating institutions for their vital contributions. This
work was supported by the U.S. Department of Energy and National
Science Foundation; the Italian Istituto Nazionale di Fisica
Nucleare; the Ministry of Education, Culture, Sports, Science and
Technology of Japan; the Natural Sciences and Engineering Research
Council of Canada; the National Science Council of the Republic of
China; the Swiss National Science Foundation; the A.P. Sloan
Foundation; the Bundesministerium fuer Bildung und Forschung,
Germany; the Korean Science and Engineering Foundation and the
Korean Research Foundation; the Particle Physics and Astronomy
Research Council and the Royal Society, UK; the Russian Foundation
for Basic Research; the Comision Interministerial de Ciencia y
Tecnologia, Spain; and in part by the European Community's Human
Potential Programme under contract HPRN-CT-20002, Probe for New
Physics.
\end{acknowledgments}
