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This thesis presents the results of a search for neutral MSSM Higgs bosons decaying to [tau tau] with 5.9 fb.−1 of data. The analysis requires at least one of the taus to decay leptonically, and explores three detection modes in two channels: [tau](e)[tau](mu), [tau](e)[tau](had), and [tau](mu)[tau](had), where the index denotes the type of tau decay. In all modes we explore the tagged and untagged channel. No signal is observed limits were set on [sigma](pp[arrow right][straight phi] + X) BR([straight phi][arrow right][tau tau]) as a function of Higgs mass. The results are also interpreted as exclusions of parameter space in the tan[beta] vs m(A) plane for several benchmark scenarios.
This thesis describes a search for the Higgs boson, a new particle predicted by a theory called the minimal supersymmetric extension to the standard model (MSSM). The standard model of particle physics, the MSSM, and Higgs boson phenomenology are introduced briefly. The search presented in this thesis uses a single final state configuration, in which the Higgs boson decays to two tau leptons, with one tau decaying to a muon and neutrinos, and the other decaying to pions and a single neutrino. Two new methods are introduced in this analysis, the Tau Neural Classifier tau identification algorithm, and the Secondary Vertex fit tau pair mass reconstruction method. Both methods are discussed in detail. The analysis uses the 2010 dataset from the Compact Muon Solenoid (CMS) experiment, which contains 36 pb−1 of integrated luminosity at a center of mass energy of 7 TeV. In total, 573 events are selected in the analysis. We fit the observed tau pair mass spectrum and measure the composition of the events. The result is compatible with the standard model expectation. No excess of signal events is observed, and we set an upper limit on the cross section times branching ratio of a Higgs boson. This limit is interpreted in the parameter space of the MSSM.