Studien zur Suche nach langlebigen Supersymmetrischen Teilchen am ATLAS Detektor

Within certain areas of parameter space in supersymmetric models with gaugemediated symmetry breaking (GMSB), long-lived heavy charged particles are predicted theoretically. Due to their high mass, they are subject to energy losses in particular momentum ranges that are noticeably larger than energy losses of known stable particles. Using Monte Carlo generated events it is shown that these high enenergy losses can indeed be observed within the ATLAS detector. Furthermore it is found that this feature of heavy charged particles can be utilized in the search for events with supersymmetry using energy loss measurements from the ATLAS pixel sub-detector. When additional cuts are applied, combined data for background processes and supersymmetric envents yield a significant excess of events containing particles that behave similar to the supersymmetric heavy charged particles. Thus, a method is provided to specifically search for such events within the used model. An integrated luminosity of 1 fb−1 is assumed for these studies.