Abstract: This thesis presents a novel study of Higgs boson production using H → bb̄ decays produced with large transverse momentum boosts, with an additional high energy jet in the event, using √s = 13 TeV proton-proton collision data collected by the ATLAS experiment, corresponding to an integrated luminosity of 136 ifb. Higgs boson signal estimates were extracted from candidate jet mass spectra using binned likelihood fits. The Higgs boson signal estimate was probed inclusively using Higgs boson candidate jets with pTjet > 250 GeV. The inclusive Higgs boson production cross-sections were examined in a fiducial region defined by Higgs boson pTH > 450 GeV, and differential bins of pTH = [300, 450] GeV; [450, 650] GeV; [650, 1000] GeV; and > 1000 GeV inclusively. As sensitivity was not sufficient to make statistically significant measurements of the Higgs boson cross-section, in all cases 95% CLs limits were set, including a first-time limit set for Higgs bosons with pTH > 1 TeV, σH (pT > 1 TeV) < 74 fb. A differential Z boson signal measurement was also made under the same conditions and compared to theoretical predictions. All results were found to be consistent with Standard Model predictions. Particular emphasis is given to the development and validation of the analysis fit model.
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