Search for New Light Higgs Bosons in Boosted Tau Final States with the CMS Experiment.

摘要

In this dissertation, I present a search for non-standard decays of a Standard Model-like Higgs boson to pairs of light bosons, as predicted in models with extended Higgs sectors. In two Higgs doublet models, including the next-to-minimal supersymmetric standard model, the Higgs boson can decay into a pair of light pseudoscalars a..;In this search, the gluon fusion, W and Z associated Higgs, and vector boson fusion production channels for the Higgs are all considered, and the decay H → aa with a → tautau is reconstructed from the tau decay products. The final state is characterized by one isolated high p T muon plus at least one highly boosted pair of taus, of which one of the taus is required to decay to a muon.;Using 19.7 fb--1 of 8 TeV center of mass pp collision data recorded by the Compact Muon Solenoid experiment at the Large Hadron Collider, a counting experiment is performed in a region of high di-tau invariant mass. We have found no excess of events above the Standard Model backgrounds, and the observed data is used to set upper limits on the branching ratio Br(H → aa)Br 2(a → tautau). These results are equally applicable to decays of the SM-like Higgs boson to a pair of light scalars h..