Date of Award

2015

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PhD)

Graduate Group

Physics & Astronomy

First Advisor

Elliot D. Lipeles

Abstract

This thesis presents the first search of an invisibly decaying Higgs

boson produced via Vector Boson Fusion on ATLAS. The dataset used for

the analysis corresponds to 20.3fb$^{-1}$ of proton-proton collisions

at $\sqrt{s} = 8$ TeV recorded at the Large Hadron Collider in 2011

and 2012. An upper bound limit is set at 95\% confidence level on the

invisible branching fraction of the Higgs Boson. A limit of 28\% is

observed (34\% expected) and interpreted using the Higgs portal model

to set a limit on the dark matter-nucleon cross section. The unique

jet final state created by Vector Boson Fusion provides a stronger

signal to background ratio than other invisibly decaying Higgs

channels. The Vector Boson Fusion analysis presented resulted in the

strongest constraint on dark matter production set by a hadron

collider.

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