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The Standard Model of particle physics successfully describes the elementaryparticles and their interactions at low energies, up to 100 GeV. Beyond thisscale lies the realm of new physics needed to remedy problems that arise athigher energies, the TeV scale and above. Supersymmetry (SUSY) is the mostfavored extension of the Standard Model that solves many of its limitations, ifpredicted SUSY particles exist at the TeV scale. The Large Hadron Collider(LHC) at CERN has opened a new phase of exploration into new physics at the TeVscale after increasing the center-of-mass energy of the proton-protoncollisions to 13 TeV. The ATLAS experiment has collected this collision datawith over 90% efficiency due to the excellent performance of many of itssystems, in particular the data acquisition system. The work described in thisdissertation ensures the efficient collection of ATLAS data as well as theanalysis of this data to search for SUSY. The search for strongly producedsupersymmetric particles decaying into final states with multiple energeticjets and either two leptons (electrons or muons) with the same electric chargeor at least three leptons was performed using the proton-proton collisiondataset of 36 fb$^{-1}$ at 13 TeV recorded with the ATLAS detector in 2015 and2016. Due to the low Standard Model background, these final states areparticularly adapted to searches for gluinos or third generation squarks inseveral supersymmetric production topologies determined from a variety ofsimplified and phenomenological models. The absence of excess over the StandardModel prediction is interpreted in terms of limits on the masses ofsuperpartners derived at 95% confidence level. In the studied decay modes anddepending on the decay topology, the existence of gluinos with masses below 1.9TeV, sbottoms with masses below 700 GeV, and neutralinos with masses below 1.2TeV are excluded.

Search for supersymmetry in final states with two same sign leptons or three leptons and jets with the ATLAS detector at the LHC