Link to the University of Pittsburgh Homepage
Link to the University Library System Homepage Link to the Contact Us Form

Higgs Boson Phenomenology at the LHC: the Standard Model and Beyond

Leung, Sze Ching (2023) Higgs Boson Phenomenology at the LHC: the Standard Model and Beyond. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

Download (2MB) | Preview


This thesis focuses on exploring the interactions of the Higgs boson with other particles and their connections to Beyond the Standard Model (BSM) physics at the future High Luminosity LHC (HL-LHC). Four studies are presented to probe the Higgs boson couplings at high energy scales and test for new physics effects.

In Chapter 2, a novel search strategy is proposed to study the Higgs decay $H\to c\bar c$ in association with vector boson fusion (VBF) jets and a photon. The photon acts as an effective trigger handle, suppressing the challenging QCD background. The projected sensitivity for $H\to c\bar c$ at HL-LHC is about 13 times the SM charm-Yukawa coupling.

Chapter 3 explores the sensitivity to off-shell Higgs boson measurements in the process $pp\to H^* \to Z(l^+l^-) Z(\nu\bar{\nu})$ at HL-LHC. Machine-learning techniques are employed to enhance the sensitivity, leading to significant results beyond existing literature.

In Chapter 4, the $pp\to t\bar{t}H$ process at the HL-LHC is used to probe the coupling between the Higgs boson and the top quark at high energy scales. The study focuses on the boosted Higgs regime with jet substructure techniques, resulting in a strong sensitivity to the new physics scale.

Chapter 5 investigates the sensitivity to high momentum Higgs boson production through VBF. We show that even with the challenging channel $H \to b\bar{b}$, new physics up to TeV scale can be reached at the HL-LHC. We also first point out that comparable sensitivity can be obtained with the VBF jet kinematics without reconstructing the Higgs boson.


Social Networking:
Share |


Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Leung, Sze Chingszl13@pitt.eduszl130000-0001-8410-9799
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairHan, Taothan@pitt.eduthan
Committee MemberLeibovich, Adamakl2@pitt.eduakl2
Committee MemberBoudreau, Josephboudreau@pitt.eduboudreau
Committee MemberWu, Xiao-lunxlwu@pitt.eduxlwu
Committee MemberChen, Mingmingchen@pitt.edumingchen
Date: 6 September 2023
Date Type: Publication
Defense Date: 20 April 2023
Approval Date: 6 September 2023
Submission Date: 1 August 2023
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Number of Pages: 133
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Physics
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: form factor, Higgs physics, BSM, Yukawa couplings
Date Deposited: 06 Sep 2023 16:55
Last Modified: 06 Sep 2023 16:55


Monthly Views for the past 3 years

Plum Analytics

Actions (login required)

View Item View Item