Degree Type

Dissertation

Date of Award

2019

Degree Name

Doctor of Philosophy

Department

Physics and Astronomy

Major

High Energy Physics

First Advisor

Soeren A. Prell

Abstract

A search for high transverse momentum Higgs bosons decaying into a b-pair when produced in association with a W or a Z boson is performed with the ATLAS detector at CERN. Three processes are reported: Z(vv)H, W(lv)H, and Z(ll)H. Data was collected in proton-proton collisions during the full Run 2 of the Large Hadron Collider at a center-of-mass energy of 13 TeV with a corresponding integrated luminosity of 139/fb. A novel Higgs tagger, called Center-of-Mass (CoM) frame, was used instead of the default ATLAS Higgs tagger Variable-Radius (VR) given the better signal efficiency of CoM, and the higher QCD and top-quark rejection compared to VR. An expected signal yield over the background from other Standard Model processes was found of to be at a significance of 2.91 standard deviations, improving the VR results by 12.9%.

Copyright Owner

Carlos Miguel Vergel Infante

Language

en

File Format

application/pdf

File Size

218 pages

Included in

Physics Commons

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