Search for Supersymmetry in Final States with a Single Lepton, B-Quark Jets, and Missing Transverse Energy at the CMS Experiment

Supersymmetry constitutes an attractive extension of the Standard Model of particle physics. It provides a natural Dark Matter candidate and is able to resolve thehierarchy problem. If Supersymmetry is a natural solution of the hierarchy problem,the supersymmetric partner particles of the top and the bottom quark may be copiously produced in proton-proton collisions at the Large Hadron Collider, resultingin final states with isolated leptons, jets, some of which originate from a bottomquark, and missing transverse energy.In this thesis, the first search for Supersymmetry in events with a single lepton,bottom quark-jets, and missing transverse energy at the Compact Muon Solenoid experiment is presented. This search is one of the worldwide first analyses that directlyprobe natural Supersymmetry. The search is performed with proton-proton collisiondata recorded at a center-of-mass energy of 7 TeV during 2011, corresponding to anintegrated luminosity of 4.98 fb−1 . To minimize the systematic uncertainties of themeasurement, the expected background from Standard Model processes is modeledwith a data-driven method. No significant deviation from the Standard Model prediction is observed. Therefore, the results are interpreted as exclusion limits uponthe parameters of the Constrained Minimal Supersymmetric Standard Model and asimplified model with four top quarks in the final state. In preparation of the nextdata-taking periods, where proton-proton collisions at envisaged center-of-mass energies of 13 and 14 TeV will open up new kinematic regions with a large discoverypotential for physics beyond the Standard Model, prospects of measuring dijet-massendpoints resulting from gluino decays are investigated.