Report on the Summer Student Project at CERN : Lepton Identification for SUSY searches in multilepton final states

We have evaluated the performance of the multivariate lepton identification from the ttH analysis in the context of SUSY searches. A retraining of the lepton MVA on a more appropriate sample was found to improve the performances when the signal is given by leptons from W decays as expected in the SUSY signatures considered. Extensions of the leptons MVA including new variables have been explored and some improvement was achieved in the rejection of the fake muons coming from light jets. Eventually the lepton MVA is found to give better performances with respect to the standard cut-based selections also in the context of SUSY analyses.