Search for tt̄H Production in the H → bb̅ Decay Channel

• Verfasst von: Rieger, Marcel [VerfasserIn]
• Titel: Search for tt̄H Production in the H → bb̅ Decay Channel
• Titelzusatz: Using Deep Learning Techniques with the CMS Experiment
• Verf.angabe: Marcel Rieger
• Verlagsort: Cham
• Verlag: Springer
• E-Jahr: 2021
• Jahr: [2021]
• Umfang: 1 Online-Ressource (XIII, 217 Seiten)
• Illustrationen: Illustrationen, Diagramme
• Gesamttitel/Reihe: Springer Theses : Recognizing Outstanding Ph.D. Research
• Gesamttitel/Reihe: Springer Theses, Recognizing Outstanding Ph.D. Research
• Gesamttitel/Reihe: Springer eBook Collection
• Hochschulschrift: Dissertation, RWTH Aachen University
• ISBN: 978-3-030-65380-4
• DOI: doi:10.1007/978-3-030-65380-4
• Datenträger: Online-Ressource
• Dokumenttyp: Hochschulschrift
• Sprache: eng
• Bibliogr. Hinweis: Erscheint auch als : Druck-Ausgabe
• Bibliogr. Hinweis: Erscheint auch als : Druck-Ausgabe
• Bibliogr. Hinweis: Erscheint auch als : Druck-Ausgabe
• K10plus-PPN: 175001470X
• K10plus-PPN:
  Universitätsbibliothek
• Lokale URL UB: Zum Volltext

Abstract

Introduction -- The tt̄H Process in the Standard Model of Particle Physics -- Experimental Setup -- Analysis Strategy -- Analysis Technologies.

Abstract

In 1964, a mechanism explaining the origin of particle masses was proposed by Robert Brout, François Englert, and Peter W. Higgs. 48 years later, in 2012, the so-called Higgs boson was discovered in proton-proton collisions recorded by experiments at the LHC. Since then, its ability to interact with quarks remained experimentally unconfirmed. This book presents a search for Higgs bosons produced in association with top quarks tt̄H in data recorded with the CMS detector in 2016. It focuses on Higgs boson decays into bottom quarks H → bb̅ and top quark pair decays involving at least one lepton. In this analysis, a multiclass classification approach using deep learning techniques was applied for the first time. In light of the dominant background contribution from tt̄ production, the developed method proved to achieve superior sensitivity with respect to existing techniques. In combination with searches in different decay channels, the presented work contributed to the first observations of tt̄H production and H → bb̅ decays.