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• 14:04, 1 June 2010 Aaa014 talk contribs uploaded File:Thesis Svandal.pdf (The ATLAS working group has defined some safe variables that is well understood at the ATLAS early data taking. With these safe variables they have developed some safe cuts by using TMVA, that removes approximatly 70%(Loose), 50%(Medium), and 30%(Tight) of the signal. In this thesis I have made a likelihoodfunction based on the safe variables, figure 4.19, if we make cuts on this likelihood we manage to keep the same amount of signal while we reject more background than the safe cuts do. As shown in table 4.2 a cut on this likelihoodfunction will reject 5 times more background than the loose cut, and 2 times more background than the medium cut. This means that it can be a good idea to use those likelihoodcuts instead of using the safe cuts. )