Searches for supersymmetric particles decaying to W and Higgs bosons in events with an isolated lepton with the ATLAS detector
2 ) zu Higgs-Bosonen zerfällt. Der Enzustand mit einem Lepton (Elektron oder Myon), zwei b-Jets aus dem Higgs Boson Zerfall und fehlendem Transversalimpuls, wurde mittels dreier statistisch orthogonaler Signalregionen untersucht. Die Daten stimmen in jeder der Signalregionen mit den Vorhersagen des SMs überein. vii Abstract The Standard Model (SM) of particle physics is a theory that provides a description of all known elementary particles and their interactions except gravitational
... ational interactions. Nevertheless, there are a few open issues which cannot be explained by the SM. Supersymmetry (SUSY) is a well motivated extension of the SM which solves some of its shortcomings and predicts the existence of new particles. This thesis presents two searches for supersymmetric particles in proton-proton collisions delivered by the Large Hadron Collider (LHC) and recorded by the ATLAS detector in 2015 and 2016. The first search considers a simplified SUSY model in which squarks and gluinos are pair-produced by the strong interactions in LHC collisions. Inspired by the discovery of the Higgs boson in 2012, this model includes Higgs bosons in the decay chain as well as W and Z bosons. The final state considered consists of one lepton (electron or muon), jets and missing transverse momentum. The analysis uses three signal regions which are designed to target the wide range of kinematics expected from squark or gluino decays. The obtained sensitivity has been compared with a reinterpretation of a published analysis which targets a slightly different supersymmetric model.