Search for squarks and gluinos in events with isolated leptons, jets and missing transverse momentum at $\sqrt{s}=8$ TeV with the ATLAS detector

This note presents a search for supersymmetry by the ATLAS experiment at the LHC in final states containing at least one isolated lepton (electron or muon), jets, with or without b-jet requirements, and large missing transverse momentum. The kinematic reach of the analysis is extended to soft leptons to increase the sensitivity to supersymmetric spectra with small mass splitting. The search is based on the proton-proton collision data at a center-of-mass energy $\sqrt{s} = 8$ TeV collected in 2012, corresponding to an integrated luminosity of 20 fb$^{-1}$. No significant excess above the Standard Model expectation is observed. The results are used to set limits on sparticle masses for various simplified models covering the pair production of gluinos, first and second generation squarks and top squarks. Limits are also set on a MSUGRA/CMSSM model and on the parameters of a minimal Universal Extra Dimensions model.