A measurement of the rate of gluon radiation in top events has been 
performed on the $106.0 \pm 4.1 $ pb$^{-1}$ of data collected collected 
by CDF during Run1A+1B of the Tevatron.  Events are selected with a lepton, 
missing energy, and 2 or more jets, of which at least one is b-tagged with a 
reconstructed secondary vertex. Jet multiplicity distributions are generated 
using \texttt{MADGRAPH} matrix elements for the processes $qq,gg \rightarrow 
t\bar{t}; qq,qg,gg \rightarrow t\bar{t}g; qq \rightarrow t\bar{t}gg$ inserted 
into \texttt{PYTHIA 6.115 + QFL$^{\prime}$}. A binned likelihood fit is 
performed on the data and relative cross-sections are extracted as a 
function of jet energy.  These cross-sections are compared to leading 
order theoretical predictions.  Agreement within errors is found. The 
performance of this measurement given the increased statistics of 
Run2A of the Tevatron is estimated. 


Posted to /cdf/pub/thesis/cdf5716_ttjets_thesis.ps
    http://www-cdf.fnal.gov/thesis/cdf5716_ttjets_thesis.ps

Posted by chill@cdfsga