Date of Award
Doctor of Philosophy (PhD)
A search for physics beyond the Standard Model in events with one or more high-momentum Higgs bosons decaying to pairs of b quarks in association with missing transverse momentum is presented. The data, corresponding to an integrated luminosity of 35.9 fb-1, were collected with the CMS detector at the Large Hadron Collider in proton-proton collisions at the center-of-mass energy √s = 13TeV. The analysis utilizes a new b quark tagging technique based on jet substructure to identify jets from Higgs ⟶ bƃ decays. Events are categorized by the number of bƃ-tagged jets, the mass of the jets, and the missing transverse momentum. No significant deviations from Standard Model expectations are observed. In the context of supersymmetry, limits on the cross sections of pair-produced gluinos are set, assuming that gluinos decay to quark pairs and a Higgs or Z boson, and the lightest supersymmetric particle. The decay chain proceeds through an intermediate particle assumed to be the second lightest in the theory. Assuming a large mass splitting between these two neutral particles, and 100% NLSP branching fraction to Higgs bosons, the lower limit on the gluino mass is found to be 2010 GeV.
Jensen, Frank Owen, "Search for Supersymmetry Using Boosted Higgs Bosons and Missing Transverse Momentum in Proton-Proton Collisions at 13 TeV" (2018). Physics Graduate Theses & Dissertations. 281.