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Item Study of WZ + heavy flavor production and prospects for differential measurements of tt̄H-multilepton with the ATLAS detector(2021-10-05) Webb, Aaron; Onyisi, Peter; Andeen, Timothy; Kilic, Can; Scott, JamesSeveral theories Beyond the Standard Model predict a modification of the momentum spectrum of the Higgs Boson, without a significantly altered rate of Higgs produced in association with top quark pairs (tt̄H). This provides a physical observable that can be used to search for new physics with data collected at the LHC. This thesis presents techniques and preliminary results for a differential measurement of the Higgs transverse momentum in tt̄H events with multiple leptons in the final state, using data collected at an energy of √s = 13 TeV by the ATLAS detector at the LHC. Preliminary results are presented for 80 fb⁻¹ of data, with projected results shown for 140 fb⁻¹. A measurement of WZ + heavy flavor production, a significant background to tt̄H that is poorly understood, is also presented. This study targets the fully leptonic decay mode, WZ→ lνll, corresponding to events with three leptons and one or two jets in the final state, using 140 fb⁻¹ of √s = 13 TeV data. Cross-section measurements for WZ + b and WZ + c for events with one or two associated jets are shown.