Search for Dark Matter and W' in the final state with one muon and missing transverse energy with CMS

This thesis describes the search for new physics in the transverse mass spectrum of events with one muon and missing transverse energy in the final state of proton-proton collisions. The studied data were recorded 2012 with the CMS detector at the LHC accelerator at a center of mass energy of √s = 8 TeV and correspond to an integrated luminosity of 20 fb−1. The transverse mass spectrum of the observed data was compared to a simulation of Standard Model processes. As no indication for new physics beyond the Standard Model of particle physics was found, exclusion limits were set. Two models of new physics were studied in this analysis, first the production of new heavy charged vector bosons W′, which decay into a muon and a neutrino and second the pair production of particles χ which are Dark Matter candidates, which recoils against a Standard Model W boson that decays into a muon and a neutrino. On the W′ model a mass limit of MW′ > 3.35 TeV was set, while on the interaction scale Λ of the Dark Matter pair production, different limits from Λ > 300 GeV to Λ > 1050 GeV were set. Limits were also set on the proton-proton cross section and the Dark Matter-nucleon cross section for the Dark Matter model.