Cosmic Non Collision Background Muon Analysis Of The ATLAS Detector With Monte Carlo Simulation In The Resistive Plate Chambers

The ATLAS detector, located at the LHC(CERN), served as one of the two key experiments for the discovery of the Higgs boson in 2012. It is centralized around one interaction point and is designed as a cylindrical multiple-use detector (4π-detector). The sensitive instruments of the detector measure each emerging particle which is then reconstructed to picture the physical processes. Thus, it is crucial to control effects uncorrelated to the particle collision to fully understand the occurring physics. Those effects not corresponding to the particular collision are called Non-Collision Background(NCB). For deciding what is NCB and what is relevant particle information, triggers are used which search the event substructure based on multiple criteria. These criteria have to be adjusted depending on the expectations and the sources of NCB have to be well studied to find those signal regions excluding them and including relevant data. Amongst other interesting aspects, this procedure opens the weakness, that unexpected new physics that does not fit the signal region is sorted out by those triggers. A possible concept holding such a structure is long-lived supersymmetry. One of the main sources producing NCB is cosmic background radiation. These particles hit the detector potentially from all sides despite its coverage by the underground position. This background can affect several process analyses through its variety of occurrences as well as mimic long-lived processes. This report aims at understanding the Monte Carlo simulation of exactly such cosmic background by investigating the muon chambers dedicated to the trigger response and comparing it with set expectations. In this connection, fully discriminating the cosmic background would reward us with highly precise predictions of backgrounds of ATLAS' main research ambitions. Thus, this research is of crucial importance