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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.
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 |
Source Type: | DISSERTATION |
Subjects: | Physics, Particle physics |
Keywords: | Atlas, Boson, Higgs, LHC, Pair, b-Jet |
Publication Number: | 10974446 |
ISBN: | 978-0-438-75639-7 |