Search for Higgs Boson Pair Production in the bbWW* Channel in SQRT(S) = 13 TeV Proton-Proton Collisions at the Large Hadron Collider Using the Atlas Detector

Abstract

This dissertation presents a search for double Higgs production in the bbWW

final state in proton-proton collisions at the ATLAS detector at the Large Hadron

Collider. Double Higgs production is predicted in the Standard Model with a cross

section of \sigma HH = 33:53fb +4:3%

+/-6:0% +/- 5:9%. Many Beyond the Standard Model theories

predict enhancements to the production cross section through resonant production.

The 2015-2016 ATLAS dataset has an integrated luminosity of 36.1 fb-1 with

a center of mass energy of sqrt(s) = 13 TeV. Candidate events are broken into two

kinematic regions: a resolved selection containing one lepton (either an electron or

muon), 2 b-tagged calorimeter jets, 2 light-

avor jets, and missing transverse energy;

and a boosted analysis containing one lepton (electron or muon), two large radius jets,

one with two ghost associated, b-tagged track-jets and missing transverse energy. No

signicant deviation from background was observed a cross section upper limit was

set for the SM double Higgs production of 10 pb and for resonant production as a

function of HH invariant mass from 500 GeV to 3000 GeV.

This dissertation includes previously published coauthored material.