A search for a SM Higgs produced via the gluon-gluon fusion is presented. 
We investigate here the decay channel $\rm gg \to h \to WW^* ~with~\rm WW^*$ 
where $\rm W^*W^*\to l\nu jet~jet$. Ref. HEP-PH/9807424 establishes the 
corresponding cross-section to be about 100 fb for higgs mass around the WW 
threshold. In this range mass, di-boson decays are dominant whereas the 
$\rm b\bar{b}$ channel dominates the Higgs decays below 140\G.

The selection of a signal in the $\rm W^*W^*\to l\nu jet~jet$ channel 
faces huge level of backgrounds, as expected in a $\rm p\bar{p}$ collider. 
The main background comes from the single W production associated with 
two or more QCD jets: $\rm W~q/g \to l\nu ~jet~jet$. Other backgrounds 
come from the di-boson productions $\rm WW \to l\nu ~jet~jet$ and 
$\rm WZ \to l\nu ~jet~jet$, which mimic the signal topology, 
as well as from the $\rm t\bar{t}$ events decaying in 
$\rm t\bar{t} \to b \bar{b}~ l~\nu~ jet~ jet$. 

In our analysis, we use a set of pre-selection cuts to isolate 
a clean and central signal while rejecting the (soft) QCD jets background.  
We then define a likelihood function to discriminate signal events 
from backgrounds on the basis of topology differences. Preliminary Monte 
Carlo studies show that a $\rm 3 \sigma$ significance effect needs an integrated 
luminosity of 150 $\rm fb^{-1}$, whereas a $95\%$ CL exclusion requires a 
luminosity of about 60 $\rm fb^{-1}$, for a 160\G Higgs. We conclude that 
this channel has to be used in combination with the associated Higgs 
production channel.