Search for strongly interacting supersymmetric particles decaying to final states with an isolated lepton with the ATLAS detector at the LHC
Two analyses searching for squarks and gluinos which decay into final states with multiple\njets, an isolated electron or muon and a large missing transverse energy are presented. Both rely on data taken by the ATLAS detector in\npp collisions at a center-of-mass energy of 8 TeV at the LHC during 2012. The first analysis uses a subset of 5.8 fb-1 of this dataset, the other analysis uses the full statistics of 20.3 fb-1. \n\nBoth analysis share the same methods regarding the triggers and the background estimation techniques. The two\ndominant backgrounds are ttbar and W+jets production. The ttbar\nand the W+jets backgrounds are estimated in a semi-data-driven method. The minor QCD multi-jet background is estimated in an entirely\ndata-driven method. The final background estimates in the analyses are derived in a profile-log-likelihood fit.\n\nNone of the analyses sees an excess beyond Standard Model expectations.\nThe analysis of the partial dataset derives limits in a MSUGRA/CMSSM model with parameters A_0=0, tan(beta) = 10\nand mu > 0 and excludes squarks and gluinos with masses below 1.2 TeV for equal squark and gluino masses.\n\nThe analysis of the full dataset derives limits in simplified models and in a MSUGRA/CMSSM model with parameters A_0=-2 m_0,\ntan(beta) = 30 and mu > 0. Gluinos (squarks) with masses below 1.2 TeV (750 GeV) can be excluded for vanishing LSP masses in simplified models. Gluino masses below 1.2 TeV can be excluded for every m_0 value in the MSUGRA/CMSSM model.