# Search for Higgs-Boson Production in Association with a Top-Quark Pair in the Boosted Regime with the CMS Experiment

Williamson, Shawn Darrell

Abstract (englisch):
In 2012, the last missing piece of the Standard Model of particle physics has been discovered by the ATLAS and CMS collaborations, the Higgs boson. Still, some production modes of this particle remain undiscovered to date. One of them is the Higgs-boson production in association with a top-quark pair (ttH). A special feature of this process is the direct access to one of the most important Higgs-boson properties: the top-Higgs Yukawa coupling. The small cross section of ttH production is one of the reasons, why this process still remains unobserved. Especially for a Higgs boson decaying into a bottom-quark pair, the irreducible background by top-quark pair production is overwhelming. A further challenge is the ambiguous assignment of jets to the numerous final-state particles in the reconstruction of the collision event. A solution to this problem is provided by the investigation of a phase space, where the massive particles feature large transverse momenta, the boosted regime. For this special case, the decay products of the massive particles are collimated and the original massive particles can be reconstructed and identified with ... mehr

 Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP) Publikationstyp Hochschulschrift Jahr 2016 Sprache Englisch Identifikator DOI(KIT): 10.5445/IR/1000068213 URN: urn:nbn:de:swb:90-682131 KITopen ID: 1000068213 Verlag Karlsruhe Umfang IX, 262 S. Abschlussart Dissertation Fakultät Fakultät für Physik (PHYSIK) Institut Institut für Experimentelle Kernphysik (IEKP) Prüfungsdatum 11.11.2016 Referent/Betreuer Prof. U. Husemann Schlagworte Teilchenphysik, CMS, Higgs-Boson, Top-Quark, ttH
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