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Search for New Physics in tt ̅ Final States with Additional Heavy-Flavor Jets with the ATLAS Detector

Javier Montejo Berlingen (Autor)

Buch | Hardcover

XIV, 283 Seiten

2016 | 1st ed. 2016
Springer International Publishing (Verlag)
978-3-319-41050-0 (ISBN)

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This doctoral thesis focuses on the search for new phenomena in top-antitop quark (tt) final states with additional b-quark jets at the LHC. It uses the full Run 1 dataset collected by the ATLAS experiment in proton-proton collisions at s=8 TeV. The final state of interest consists of an isolated lepton, a neutrino and at least six jets with at least four b-tagged jets, a challenging experimental signature owing to the large background from tt+heavy-flavor production. This final state is characteristic of ttH production, with the Higgs boson decaying into bb, a process that allows direct probing of the top-Higgs Yukawa coupling. This signature is also present in many extensions of the Standard Model that have been proposed as solutions to the hierarchy problem, such as supersymmetry or composite Higgs models, which predict the pair production of bosonic or fermionic top quark partners, or the anomalous production of four-top-quark events. All these physics processes have been searchedfor using an ambitious search strategy that has been developed on the basis of a combination of state-of-art theoretical predictions and a sophisticated statistical analysis to constrain in-situ the large background uncertainties. As a result, the most restrictive bounds to date on the above physics processes have been obtained.

Javier Montejo studied physics and computer science at the Universidad de Salamanca and obtained a Masters and PhD at the Universidad Autónoma de Barcelona. He studied various aspects of the hierarchy problem in the tt plus heavy flavor final state. The search for ttH constitutes currently the most precise determination of the top Yukawa coupling. Additional searches for beyond-the-standard-model signatures in the same final state have placed stringent constraints on the particles predicted by some of most favored theories that address the hierarchy problem. His current work is focused on supersymmetric models with emphasis on unusual signatures through which supersymmetric particles might have gone unnoticed.

Introduction.- Theoretical Framework.- Event Simulation.- Reconstruction of Physics Objects.- Common Aspects in Searches for New Physics in tt¯ Final States with Additional Heavy-Favor Jets.- Statistical Analysis.- Searches for New Physics in tt¯ Final States with Additional Heavy-Flavor Jets.- Conclusions.

Erscheinungsdatum	08.10.2016
Reihe/Serie	Springer Theses
Zusatzinfo	XIV, 283 p. 196 illus., 119 illus. in color.
Verlagsort	Cham
Sprache	englisch
Maße	155 x 235 mm
Themenwelt	Naturwissenschaften ► Physik / Astronomie ► Atom- / Kern- / Molekularphysik
	Naturwissenschaften ► Physik / Astronomie ► Hochenergiephysik / Teilchenphysik
	Naturwissenschaften ► Physik / Astronomie ► Quantenphysik
	Naturwissenschaften ► Physik / Astronomie ► Theoretische Physik
	Naturwissenschaften ► Physik / Astronomie ► Thermodynamik
Schlagworte	Additional Heavy Flavor • Elementary Particles, Quantum Field Theory • Four Top production • Heavy Stop • Hierarchy Problem • Higgs To Bb • Physics and Astronomy • Quantum Field Theories, String Theory • Top Yukawa Coupling • tt Plus Heavy Flavour • Vector-Like Quarks
ISBN-10	3-319-41050-4 / 3319410504
ISBN-13	978-3-319-41050-0 / 9783319410500
Zustand	Neuware