Dissertation/Thesis Abstract

Search for Pair Production of Higgs Bosons in the Four Bottom Quark Final State Using Proton-Proton Collisions at √S = 13 Tev with the ATLAS Detector
by Bryant, Patrick, Ph.D., The University of Chicago, 2018, 351; 10974446
Abstract (Summary)

A search for Higgs boson pair production in the four b-jet final state is carried out with up to 36.1/fb of LHC proton--proton collision data collected at √s = 13 TeV with the ATLAS detector in 2015 and 2016. Three benchmark signals are studied: a spin-2 graviton decaying into a Higgs boson pair, a scalar resonance decaying into a Higgs boson pair, and Standard Model non-resonant Higgs boson pair production. This thesis presents a search in events with four individually resolved b-tagged jets. Higgs bosons produced with large momenta are reconstructed as single large radius jets with substructure. The analysis of this topology is presented in CERN-THESIS-2018-118. The two analyses are statistically combined and upper limits on the production cross section of Higgs boson pairs times branching ratio to four b-quarks are set in each model. The combined result searches for resonance masses in the range 260–3000 GeV. No significant excess is observed; the largest deviation of data over prediction is found at a mass of 280 GeV, corresponding to 2.3 standard deviations globally. The observed 95% confidence level upper limit on the non-resonant production is 13 times the Standard Model prediction.

Indexing (document details)
Advisor: Shochet, Melvin
Commitee: Savard, Guy, Schmitz, David, Wagner, Carlos
School: The University of Chicago
Department: Physics
School Location: United States -- Illinois
Source: DAI-B 80/05(E), Dissertation Abstracts International
Subjects: Physics, Particle physics
Keywords: Atlas, Boson, Higgs, LHC, Pair, b-Jet
Publication Number: 10974446
ISBN: 9780438756397
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