Measurement of the Top Pair Production Cross Section in the
All-hadronic Decay Channel at CDF

The top quark is the heaviest particle yet observed,
and was discovered relatively recently.  Thus, tests
of top quark production in all three decay channels are
very important. The so-called all-hadronic channel is 
the mode where both W bosons from the top decays decay
into quarks. The all-hadronic channel is difficult
due to the large multi-jet QCD backgrounds, but provides
important information, allowing us to better measure the
branching ratios for top decay as well.

CDF presents a new measurement of the top
production cross section in the all-hadronic channel
section from $p\bar{p}$ collisions at 1.96 TeV using 
$0.3$ fb$^{-1}$ of data taken with the CDF 2 detector. 
For top all-hadronic events (identified by 
events with five or more jets, a b-jet tag requirement,
and topological selections consistent with top-antitop)
multivariate approaches are used to separate top from
the large QCD jet backgrounds.