Associated Z+Higgs Boson Production in the Leptonic+Beauty Final State and the Upgrade of the Pixel Detector at CMS

A standard model Higgs boson, radiated off by a leptonically decaying Z boson, is searched for in the b ¯b-quark decay mode by analyzing the full 7+8 TeV LHC dataset recorded with the CMS detector. The used methods are discussed in detail and finally the results shown, including combinations with other search channels. The diboson production cross section for the processes W Z and ZZ are measured at 8 TeV using the same framework. Furthermore, event generators for the future of this analysis are reviewed for the signal process as well as the most important source of backgrounds. The pixel detector, one of the key elements to this analysis and the innermost component of CMS, will be replaced in the coming years. The transition to the new readout electronics and the qualification procedures for detector modules is part of this thesis. A complete set of results obtained using the developed testing procedures are presented for one of the first prototype modules.