Abstract

A search of the Higgs boson decaying into a pair of bottom quarks using the WH and ZH associated production is performed with the ATLAS detector. The analyzed data were collected in 2015, 2016, 2017 and 2018 LHC Run-2 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 139 fb−1. Final states that contains 0, 1, and 2 charged leptons (electrons or muons, denoted as l) are considered, to target the processes of Z→νν, W→lν and Z→ll. Object reconstruction, event selection, and signal and control region definition are included. Systematic uncertainty and statistical analysis used to extract the final results are presented. This analysis observes the production pp→(W,Z)H in H→bb channel at a significance of 6.7 standard deviations (where the expectation is 6.7 standard deviations) and represents the most precise observation to date of this physics process. Cross-sections of VH (WH and ZH) with V→leptons and H→bb are measured as a function of the vector boson transverse momentum in the kinematic fiducial volumes and found to be consistent with the Standard Model predictions.

Degree Date

Fall 12-19-2020

Document Type

Dissertation

Degree Name

Ph.D.

Department

Physics

Creative Commons License

Creative Commons Attribution-Noncommercial 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License

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